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Aerospace/Aviation/Questions Answered by Expert Mark Janus
| Subject | Date Asked |
| science fair | 12/8/2011 |
| Q: Mr.Janus, My name is Aaron jones i am an eighth grader at bonham junior high school and my partner ... A: Even though paper airplanes appear exceedingly simple, what makes them fly (or fly well) is not so ... | |
| Super cruise | 7/24/2011 |
| Q: Plz just tell me what is super cruise in fighter jets. ANSWER: Super cruise is sustained supersonic ... A: Nothing comes to mind specifically.... to achieve super cruise performance, integrating the load ... | |
| Increasing Thrust | 7/19/2011 |
| Q: I have seen in movies that while take off fighter jets(like F-18) contract their end of the booster ... A: While changing the area ratio of the nozzle does improve nozzle performance under differing ... | |
| fluid dynamics from flow of oil | 6/7/2011 |
| Q: Do you understand flow rate as it applies to oil gushing out of the ocean floor like what happened ... A: I would, yes.... but generally I am a (computational) aerodynamicist... so I predominantly work ... | |
| fluid dynamics from flow of oil | 6/7/2011 |
| Q: Do you understand flow rate as it applies to oil gushing out of the ocean floor like what happened ... A: I'm not sure of your question.... I do believe I understand flow rate.... as to the fluid(s) and ... | |
| Contrails | 3/4/2011 |
| Q: I recently viewed a four engined jet aircraft leaving a contrail looking like it had some sort of ... A: Well I know of no commercial jet that somehow pulses its jet engines (especially four in sync)...so ... | |
| falling speed in air and liquid | 2/12/2011 |
| Q: if you have a falling particle with a irregular shape, you can calculate what the diameter of a ... A: No... the terminal velocity of an object is a function of (depends on) the drag of the object... ... | |
| Canard | 2/4/2011 |
| Q: Mark,I just want to know the use of canard in fighter planes like in sukhoi-30. Thank You A: canards on fighter aircraft are generally used as a lift enhancement mechanism... (along with being ... | |
| Rotor blade planes | 2/3/2011 |
| Q: Mark,I just want to ask that why the rotor blade planes cannot fly at high speeds specially above ... A: Vehicles with rotating components designed to provide lift or thrust are very much limited in the ... | |
| Curising altitude | 2/3/2011 |
| Q: Sir,I just want to know that why the aircrafts cannot fly above a certain altitude like for example ... A: The air is to "thin" at extremely high altitudes... Basically the air molecules settle near the ... | |
| Aerodyanamics | 1/31/2011 |
| Q: Sir, as u can see in the picture of f-22 raptor that there is a smoke trail over the wings of the ... A: At the tip of all lifting surfaces (wings, rudder, horizontal stabilizer...) there is a vortex... ... | |
| Aerodynamics | 1/29/2011 |
| Q: Sir,last month i had to flew to some other city in India. I boarded boeing 737-800.when I sat on the ... A: If I'm understanding you correctly, you noticed the wings curved at the tips... those are called ... | |
| Questions | 11/30/2010 |
| Q: My name is Zack and I plan on studying as an Aerospace Engineer. I am going to enter a university in ... A: Only you know what you plan to do with your degree (in your country)... and if you don't, you may ... | |
| How areplane fly | 11/19/2010 |
| Q: I am bit confused on how aeroplane fly. Some says it gets lifted caused by reaction force. It is ... A: Both views are correct.... If you are considering viewing from a distance, basically Newton's third ... | |
| avionics | 11/1/2010 |
| Q: what is avionics?can we call avionics engineer also aerospace? aeronautical engineer?if yes then ... A: Although not really my field of expertise, I'll give you my shot at it.... avionics is the area of ... | |
| fluid dynamics | 8/6/2010 |
| Q: ..i would like to ask you how can i use my knowledge to make some mini projects related to fluid ... A: with very little to go on, you could look up the Coanda effect, the Magnus effect, Kline-Fogleman ... | |
| aerospace | 7/5/2010 |
| Q: "hello sir i had finished 12th std. my pcm marks is 86.67% i want in isro or nasa. what are the ... A: Some of what you ask, I am not qualified to respond to.... that said, sure you can get a bachelors ... | |
| lift vs. downward thrust | 6/28/2010 |
| Q: There is a concept which I think should be simple, however I cannot understand it. What would be the ... A: When the dust all settles (no pun intended), both methods do the same thing.... they both push the ... | |
| MS in aerospace/Avionics | 6/23/2010 |
| Q: I am currently pursuing my Bachelors in Electronics as well as my MS in mathematics. I would like to ... A: This is not really in my line of expertise... that said, yes you would need background courses in ... | |
| Scope of M.S in Aerospace | 5/28/2010 |
| Q: sir,i would like to ask is there any scope for MS in Aerospace as i will passing out in 2012 as ... A: You still have a bit of time left before you finish up, so I would advise that you simply follow the ... | |
| engineering | 5/20/2010 |
| Q: sir i am very much interested in space research sir.i scored 96% marks in physics,chem & maths in ... A: Yes it would be different and you would have to probably take some ASE UGRAD courses to be able to ... | |
| engineering | 5/18/2010 |
| Q: sir i am very much interested in space research sir.i scored 96% marks in physics,chem & maths in ... A: I take it the schools you are looking at do not have a "space" component... and hence your choice ... | |
| About doing masters in Aerospace engineering | 5/15/2010 |
| Q: I have done B.Tech in Aeronautical engineering from India and looking forward to do masters in ... A: I would say (from my experience at our university) that composites are hot right now. As for ... | |
| CFD | 5/5/2010 |
| Q: I am about to finish my mechanical engineering (in 2 month) and as i was interested in Aerodynamics ... A: Harsh, Computational aerodynamics uses simulation and theory along with some experimental data to ... | |
| CFD | 4/28/2010 |
| Q: I am about to finish my mechanical engineering (in 2 month) and as i was interested in Aerodynamics ... A: Sorry it took a bit for me to get to your question, but I needed to take the time to review the ... | |
| Heat pipes | 3/27/2010 |
| Q: Can a gravity designed heat pipe work with an intermittent G-Force. example: a heat pipe in a race ... A: Not exactly my area of expertise, but I would say it may not work as efficiently, but believe that ... | |
| Paper Airplanes | 2/22/2010 |
| Q: I'm doing a science fair project and i'm trying to figure out what the best way to modify a paper ... A: Airplanes, whether paper or big commercial airliners are fairly complicated... In order to maximize ... | |
| Gimbal Vs Thrust Vectoring | 2/19/2010 |
| Q: what is the difference between Gimbal Control and Thrust Vectoring Nozzle? and what is the ... A: The action of directing the jet exhaust gases (of a jet or rocket) off axis by some angle (usually ... | |
| Paper airplanes | 2/12/2010 |
| Q: Hi my name is Houston and I am 11 years old. I am doing my science fair project on paper airplanes. ... A: I apologize for the delay in getting to your question(s). Yes the wider span reduces a form of drag ... | |
| lift | 2/4/2010 |
| Q: I am trying to found out if one were to create a low pressure(L.P.) above a surface (as in the way a ... A: I would say, based on what you've shown the idea would produce a resultant force in the vertical ... | |
| lift | 1/13/2010 |
| Q: I am trying to found out if one were to create a low pressure(L.P.) above a surface (as in the way a ... A: No matter what method is used, the pressures on the surface (summed up over the entire surface(s)) ... | |
| About CFD | 1/12/2010 |
| Q: hope you remember me. I was not able to ask anymore follow ups in last question that I asked you ... A: Only if you are working for an aerospace company doing business with the government (primarily ... | |
| About CFD | 1/9/2010 |
| Q: hope you remember me. I was not able to ask anymore follow ups in last question that I asked you ... A: There are numerous universities in the US that provide CFD training... Let me suggest that you ... | |
| About CFD | 1/2/2010 |
| Q: I am a fresher Aeronautical engineer from Mumbai, India. I want to make my career in CFD field for ... A: My suggestion is to apply to graduate school after you get your undergraduate degree in aero.... ... | |
| About CFD | 12/30/2009 |
| Q: I am a fresher Aeronautical engineer from Mumbai, India. I want to make my career in CFD field for ... A: Sure STAR-CD and STAR CCM+ are heavily used in industry...(I believe the auto industry has been ... | |
| Fluid mechanics (water waves) | 12/21/2009 |
| Q: I have a question about fluid mechanics but it's specifically relevant to costal engineering, so if ... A: You are correct in that free surface fluids is not my specialty but I'll through some possibilities ... | |
| Parachutes | 12/12/2009 |
| Q: I have noticed that when calculating the perimeter of rectangular parachute canopies with ... A: Basically you have high pressure air on one side trying to get to the low pressure side... the more ... | |
| Wing postion | 11/30/2009 |
| Q: I am a student pilot researching a few homebuilts. The major difference between two of the designs ... A: Without fairings and fillets, the mid wing would be the "less drag" configuration... with fairings ... | |
| Air flight sounds | 9/16/2009 |
| Q: Does our stealth planes make noises when flying overhead? Thanx, Paul ANSWER: I can't say ... A: The stealth fighter is not that large.... you didn't say how fast it was going.... could it have ... | |
| Air flight sounds | 9/14/2009 |
| Q: Does our stealth planes make noises when flying overhead? Thanx, Paul A: I can't say definitively, but I'm confident the acoustic signature has been considered in the ... | |
| Physical explanation of enthalpy | 9/3/2009 |
| Q: I have checked about a dozen sources and have not grasped the physical interpretation of enthalpy. ... A: Beyond its mathematical statement, enthalpy gives an alternate view of the energy of a system.. ... | |
| windmills | 8/31/2009 |
| Q: I am trying to make a windmill. Please look at my sketch. Can you think of an answer to my two ... A: This type of windmill is called a Savonius design basically you don't have to let the flow go ... | |
| Aircraft Configuration | 8/6/2009 |
| Q: What are the advantages of asymmetric Aircraft in terms of forces and moments acting over them? A: Just off hand I'm not certain on any of advantages or disadvantages of an asymmetric design... it ... | |
| Mach 2 with open cockpit | 7/28/2009 |
| Q: Popular Science currently has an article about a SU-27 flying at Mach 2 with an open ... A: I would say it's hype... while being in the wake of an object provides some "protection", at Mach 2 ... | |
| Gaskets | 7/27/2009 |
| Q: I'm not sure how a gasket works. From the pictures on this site, I really don't see how it can ... A: Consider for example you've developed a pipeline to pump a fluid... the pipeline must be built in ... | |
| hypothetical flight scenario question... | 7/15/2009 |
| Q: This is a question my cousin came up with... I am thinking about how to solve it... --- If a jet ... A: What you've calculated sounds reasonable, except the circumference of the Earth is about 25,000 ... | |
| Aerospace master | 6/18/2009 |
| Q: I am looking for ideas regarding my research proposal for the aerospace master, can you help? my ... A: Why don't you think about the systems that you work(ed) with as an A&P mechanic and then determine ... | |
| Model Rocketry Project | 6/17/2009 |
| Q: I am entering my senior year in high school and am working on a scholarship project through a ... A: I don't think a "wind tunnel" test will work inside a rocket. You could study different conical ... | |
| about CFD | 6/10/2009 |
| Q: I am now doing AMAeSI(Associate Member of Aeronautical Society of India).Now i heard that CFD has ... A: CFD has become quite mainstream with any company engaged in business that involves fluid flow... In ... | |
| Better course: Aerospace or Aeronautics? | 5/30/2009 |
| Q: Respected Sir, I have finished my High School (12th grade) in Inida and I would like to know which ... A: I would say that the future is more promising for aerospace than aeronautics. Aeronautics implies ... | |
| Physics of flight | 5/26/2009 |
| Q: In the midst of the great debate on downwind turns the following claim was made: "The inertial ... A: A helicopter in hover is independent of the wind speed and yes it would be carried with the wind (at ... | |
| Aerospace Terminology | 5/20/2009 |
| Q: Janus! Recently I read a paper written in 1935. The author describes a rapid, powerful flow of ... A: Even though they didn't have jet engines as we know them, they were working on that at the time ... | |
| Wing load | 5/19/2009 |
| Q: Mark Is a wing load reduction by 1 lb/sq ft significant to the performance of the aircraft or ... A: I would say a change in wing loading of 10% is significant (it's the percentage change that would ... | |
| asking yr advice | 5/16/2009 |
| Q: is doing a graduate in aeronautics and a postgraduate in aerospace is equivalent to doing an UG an ... A: I would say they are equivalent for the most part... the "space" part of the name implies there is ... | |
| informatio OF AEROSPACE | 5/12/2009 |
| Q: .BASICALLY WHAT ARE THE MAIN DIFFRENCES AMONG AEROSPACE ENGINEERING, AEROSPACE SYSTEM ENGINEERING ... A: This is somewhat my opinion.... Aerospace Engineering involves all aspects of aeronautical ... | |
| Physics of flight | 5/11/2009 |
| Q: In the midst of the great debate on downwind turns the following claim was made: "The inertial ... A: Sorry for the delay in getting to your question... Kinetic energy is a relative property of a body ... | |
| helicopters | 5/6/2009 |
| Q: It has often puzzled me that helicopters can fly forward at high speeds. The main rotor of a ... A: The main rotor also provides the thrust.... by tilting the plane of rotation slightly forward the ... | |
| Masters or find job after bachelors | 4/3/2009 |
| Q: I am Sai. I want to know wether it will be better to try job after my bachelor degree in ... A: Well, I would say it depends on what options you have.... if you can find a job in today's market ... | |
| high speed stalls | 4/3/2009 |
| Q: I know its not impossible for a modern plane to stall as speeds around or in excess of Mach 2, but I ... A: yes - other than your "no discernable effect" statement you are correct... I would say you would ... | |
| high speed stalls | 4/2/2009 |
| Q: I know its not impossible for a modern plane to stall as speeds around or in excess of Mach 2, but I ... A: Yes.... I'd say bending or snapping your wings off would be catastrophic.... but what follows that ... | |
| high speed stalls | 4/2/2009 |
| Q: I know its not impossible for a modern plane to stall as speeds around or in excess of Mach 2, but I ... A: Actually I'm wondering what your definition of a "stall" is ... If you are considering stall to be ... | |
| ducted propulsion | 3/23/2009 |
| Q: I would like to know if a ducted squirrel cage fan could make suitable propulsion for an ... A: Sorry for the delay in getting back on this question... I've never seen that done for a ducted ... | |
| Paper Airplane Science Project | 2/22/2009 |
| Q: Mark, my nine year old son is doing a science fair project on paper airplanes. He is using different ... A: Well, that's an interesting project to work on with your son... actually there are two issues ... | |
| Aerospace Postgrad | 1/17/2009 |
| Q: May I wish you the best for the New year. Impressive profile you have. Permit me to approach you on ... A: The multidisciplinary degree basically requires the student to take courses in eg. mathematics, ... | |
| scholarships | 12/11/2008 |
| Q: hey mark i need some money bad for college, i am a high school senior and i, nor my family as far as ... A: All I can suggest is to check out Miss State and contact the financial aid office.... You don't ... | |
| computer | 11/27/2008 |
| Q: am a freshman who is doing computer science and i would like to know how i can use the course to ... A: Computer science and aerospace are very different and hence do not share a lot of courses (at an ... | |
| types of careers that can be taken up after aeronautical engineering | 11/23/2008 |
| Q: respected sir, i am very much interested in taking up the aeronautical engineering but i need a ... A: Aeronautical engineers work for companies such as Boeing, Airbus, Lockheed-Martin, Grumman, and many ... | |
| Aeronautics and Math | 11/19/2008 |
| Q: How is algebra, trig, calc, matrix algebra ect specifically apply to aeronautical engineering? A: The mathematical equations that describe the aerodynamics, flight characteristics, performance, etc. ... | |
| Personal Aerospace Projects | 9/20/2008 |
| Q: Greetings Mark, I was wondering if you had any suggestions of personal aerospace projects or ... A: So sorry for the delay in getting back.... yours is a tough question to answer but about the best I ... | |
| Aerospace Eng. UK or US | 9/14/2008 |
| Q: I wanted to know if is there any difference between the Aerospace engineering course in the UK and ... A: I'm really not qualified to answer this question (yet may be able to discover more by discussing ... | |
| what master degree in aviation can a computer engineer have? | 9/11/2008 |
| Q: i am computer engineer i would like to have master degree in aviation field "i love aviation it is ... A: You could look into computational engineering (or computational science and engineering) as a ... | |
| Soundwaves following passenger jet craft | 9/7/2008 |
| Q: I was on an evening walk tonight near the local airport, with a steady stream of mid-sized 2-engine ... A: Nathan, I'm not sure by your description, but you may have heard the jet reversing (after landing). ... | |
| voith schneider propeller | 9/6/2008 |
| Q: I don't know if this question is in your specialty. Anyway, could you tell me about voith schneider ... A: You got me on this one... had never heard of them... so I googled it and apparently they're using ... | |
| Mmo and Mdf | 8/30/2008 |
| Q: Vmo is defined as the max indicated airspeed /mach no which can be intentionally flown and at which ... A: Mcrit is the speed when sonic flow first appears shock waves (of significance) only form after ... | |
| Mmo and Mdf | 8/30/2008 |
| Q: Vmo is defined as the max indicated airspeed /mach no which can be intentionally flown and at which ... A: Mcrit is the Mach number at which supersonic flow first appears on a body.... Mcrit occurs before ... | |
| aero space jobs | 8/19/2008 |
| Q: sir, i am doing MS in aero space engineering.what are the job opportunities in this field? ANSWER: ... A: There are several companies that you have potential to work for... The big ones that come to mind ... | |
| aero space jobs | 8/17/2008 |
| Q: sir, i am doing MS in aero space engineering.what are the job opportunities in this field? A: Without knowing what your specific focus is (eg aerodynamics, structures, flight mechanics, etc.) ... | |
| Air_flow | 8/7/2008 |
| Q: Every time I watch some program about aerodynamics, when it comes to the question of how the ... A: Yes there are equations that tell us the relation between pressure and velocity... the equation is ... | |
| Spool and card demonstration | 7/11/2008 |
| Q: and thanks for any help you can offer. I'm taking a fluid mechanics class, where the book mentions ... A: Yes, I see this is quite different than what I was envisioning... In this case, the air (pressure) ... | |
| Spool and card demonstration | 7/11/2008 |
| Q: and thanks for any help you can offer. I'm taking a fluid mechanics class, where the book mentions ... A: If I understand the demonstration project, the spool is held with its axis (hole) vertical and the ... | |
| Space Shuttle | 6/24/2008 |
| Q: On main engine ignition, I have noticed three covered holes near the main engines. There are more ... A: I'm sorry for the delay, but I'm not sure of to purpose for the cover panels.... I believe they are ... | |
| Human powered flight | 5/10/2008 |
| Q: If you had a scaled down pair of helicopter blades (made out of something light, such as plastic), ... A: Just roughing out some numbers... a 10 ft blade with 1/2 chord would need to rotate at least ... | |
| aircraft performance | 3/23/2008 |
| Q: i am training on cessna aircraft. I don't understand when someone says the aircraft is old or the ... A: Sorry for the delay.... I had some trouble getting on to the AllExperts site.... I don't consider ... | |
| Centerline thrust concept | 3/13/2008 |
| Q: I'm aeronautical engineering student. I have some doubts about the common engine configuration for ... A: All engines are usually offset slightly to accommodate for engine torque effects... I'm not 100% ... | |
| Delima | 3/6/2008 |
| Q: I have a B.E. in Electronics and Communication. I want to do masters in Avionics/aerospace ... A: I don't think you need a degree in aerospace to work in the area of avionics.... my opinion... get ... | |
| Eco air travel | 2/27/2008 |
| Q: I am a trend analyst in London and i am researching into how the future of gadgets and technology ... A: Due to their very nature, aircraft have been on a steady course of increased efficiency (longer ... | |
| Confusion | 2/18/2008 |
| Q: Hello I have completed my BE in Mechanical and want to pursue my MS in aerospace but unable to ... A: Abhishek, With a BE in mech you should have relatively easy adjustment into an aerospace program. ... | |
| Coanda effect and curves | 2/14/2008 |
| Q: Dr. Janus. I'm a aeronautical engineering student. I'm fascinated with the Coanda effect. I have ... A: Well the "equations" would be the Equations of Fluid Motion (EFM) but I don't know of any particular ... | |
| Drag (or shape) factor | 1/29/2008 |
| Q: I must repeat my question from jan 22-nd more precisely. I find the drag factor of body created by ... A: Please e-mail me a drawing, because at this point I'm not sure of what shape you are asking ... | |
| Shape factor of half-cylinder | 1/22/2008 |
| Q: I am interested in Savonius rotor, which uses the different aerodynamical shape factor for concave ... A: I'm assuming you mean the drag coefficients for an open cup facing the flow as compared to that ... | |
| computational fluid dynamics | 12/28/2007 |
| Q: sir can u just give a brief introduction about research tool A: Computational Fluid Dynamics (CFD) is the name given to methods or techniques used to simulate fluid ... | |
| bird flight | 12/25/2007 |
| Q: How to computer simulate flight control of birds or insects ? What are the essential parameters ... A: Biological flight is quite a complicated combination of feedback and control. We can simulate the ... | |
| About Aeronautical studies | 12/18/2007 |
| Q: Respected sir, I am S.Yogeshraj.I am doing my B.tech Final year in Information ... A: Sorry for the delay.... holiday season and I'm not checking my e-mail regularly.... I wouldn't ... | |
| Coanda Aircraft | 12/17/2007 |
| Q: I have been researching and building my own Coanda aircraft ... A: Sorry for the delay in getting back.... haven't been monitoring my e-mail adequately over the ... | |
| Aeronautical Engineering Science Fair Project | 11/27/2007 |
| Q: My name is Calum, I am in 8th grade middle school and interested in a career in Aviation (As a pilot ... A: This is a little outside of my area, but you can measure the barometric pressure, and the ... | |
| career planning | 11/14/2007 |
| Q: iam doing my bachlor's first year in aerospace engineering in malaysia american degree programme. so ... A: Getting a BS in Aerospace (AsE) is a good idea if you are passionate about AsE, as you will cover ... | |
| aerospace | 11/13/2007 |
| Q: I have to do an experiment on aerospace or aerodynamics??any ideas im in 10th grade and could really ... A: You can study the relationship between the length and width of a flat plate (a card) to the rate at ... | |
| rocket science | 11/11/2007 |
| Q: would the rocket action still occur if there were no surrounding air?? A: Maria, A rocket operates off of the principle of action and reaction... a rocket "ejects" exhaust ... | |
| Rocket fuel | 11/1/2007 |
| Q: What rocket uses the most fuel? Can you tell me where to find information on rockets and how much ... A: I've only worked with a few rocket simulations (the specs of which I was given by the ... | |
| reg compressible fluids | 10/23/2007 |
| Q: i'd like to know that is water a compressible fluid? if not then how the water jet machining is done ... A: Yes for all practical purposes, water is incompressible... Fluid compressibility has to do with ... | |
| Rocket Engines | 10/11/2007 |
| Q: I was once told that a rocket engine is actually an inertial propulsion device (totally unlike a jet ... A: No it is not true that you must have something (surrounding you) to "push" on for propulsion... A ... | |
| Rocket Engines | 10/10/2007 |
| Q: I was once told that a rocket engine is actually an inertial propulsion device (totally unlike a jet ... A: I would have to say that the "speed limit" you refer to for air, land and sea vehicles is imposed by ... | |
| Rocket Engines | 10/10/2007 |
| Q: I was once told that a rocket engine is actually an inertial propulsion device (totally unlike a jet ... A: A rocket engine and a jet engine operate on the same basic principle yet the jet must capture its ... | |
| Thrust from inlet + diffuser | 10/2/2007 |
| Q: I've read that only 8% of the thrust for a supersonic aircraft is generated by the engine, but the ... A: Rajesh, I'm not sure of where you read that, but... For an aircraft that goes supersonic (like ... | |
| space ships | 8/18/2007 |
| Q: I know this is'nt exactly your area, but if you were in space on a space ship and you lit up a ... A: First of all, you would NEVER do this, but in theory the flame would extinguish itself because there ... | |
| why use bank instead of just yaw | 8/18/2007 |
| Q: To my understanding, yaw will cause a change in heading. So why do we bank to turn, i.e. change ... A: The question is a bit out of my area (i.e. stability and control), but yes a turn from yaw alone is ... | |
| project help | 7/30/2007 |
| Q: i wanted your help in selecting a project. i just passed my sixth semester. I am doing aerospace ... A: For example, you could study the effects of varying the location of the discontinuity in the ... | |
| aerodynamics | 7/29/2007 |
| Q: what is aerodynamics?and what basic things should an aeronautical engineer should know about ... A: Aerodynamics is the study of the flow of gases (like air). Fluid dynamics is the study of all ... | |
| project help | 7/28/2007 |
| Q: i wanted your help in selecting a project. i just passed my sixth semester. I am doing aerospace ... A: You could study an autorotating flat plate. (easy to make... a little more costly to analyze.... ... | |
| Information about CFD | 7/26/2007 |
| Q: I'm sai doing aerospace engineering in a reputed institute in moscow..i would like to clarify my ... A: Computational Fluid Dynamics is the study of fluid flow in and around objects. The mathematical ... | |
| guided missile | 7/11/2007 |
| Q: Does the guided missiles really exist and are used for real missions? Can they really follow a ... A: Sure guided missiles exist (as a matter of fact most all missiles are guided nowadays)..... They ... | |
| turbofan thrust | 6/11/2007 |
| Q: do you know what percentage of the forward thrust of a modern commercial jet's turbofan engine comes ... A: Had to look this up..... (see Mattingly - Elements of Gas Turbine Propulsion)... The formula for ... | |
| Qualities of a Flying Machine | 6/5/2007 |
| Q: Mark. I work for a children's museum. I am developing an exhibit on flying machines (both aircraft ... A: 1. true 2. it has a shape that deflects air downward to create enough lift to overcome the forces of ... | |
| Engine Shutdown during flying | 6/4/2007 |
| Q: How long can a jet engine like Boeing 747 for example can glide when it has four engine failures?? A: This is not really in my area of expertise.... try someone who deals with overall aircraft ... | |
| aeronautics to space | 5/30/2007 |
| Q: I am taking an admission in aeronautical engineering college and want to know whether I can pursue ... A: Vivekanand, Don't worry about being an aeronautical engineer instead of an aerospace engineer. ... | |
| movement of a/c | 5/14/2007 |
| Q: does the a/c engine sucks the air ahead of it and create low pressure ahead of it and therefore able ... A: By a/c I'm guessing you mean propeller aircraft.... actually whether a propeller or a jet is used, ... | |
| motor vehicle aerdynamics | 5/1/2007 |
| Q: which is more aerodynamically efficient, car driving close to a wall or in the open? and would ... A: The aerodynamics of the situation is a bit complicated, but I have read that the car will experience ... | |
| wind forces with speed | 4/26/2007 |
| Q: im writing a technical report on the design of some wind sails which I hope will catch the wind only ... A: It's difficult to visualize the orientation of your design, but wind air dynamic pressure is equal ... | |
| Coaxial contra rotating propellers | 3/25/2007 |
| Q: Hallo! Could you please explain to me the aerodynamic advantages of coaxial contra rotating ... A: I'm so sorry this question got by me....my e-mail notice must have gotten lost with other messages ... | |
| hydraulic pressure and hydraulic lock | 1/26/2007 |
| Q: In the chinook helicopter, there is power transfer unit that supplies hydraulic pressure of 3000psi ... A: I'm not really qualified to answer your question (about the specifics of the Chinook helicopter) but ... | |
| candle parachute | 1/23/2007 |
| Q: I saw this short celebration on TV once whereas the people where releasing candles (in memory of??) ... A: I believe I've seen these also. Basically (I believe) they are somewhat like a hot air balloon/drag ... | |
| Pulsejet | 9/3/2006 |
| Q: I want the methodology design of thermodynamics and Aerospace for Pulsejet Engines. A: Interesting how blunt you are with your question! The answer is too detailed to cover here. Just ... | |
| Fluid Mechanics | 7/24/2006 |
| Q: I am a student of Aeronautical Engg. I study in 2nd year in the 3rd semester. I wanted to know what ... A: Sorry for the delay... Fluid mechanics is the study of how a fluid (a substance that can't support ... | |
| gyrocopters | 7/9/2006 |
| Q: I am confused by the explanation of the term flapping, as regards the stabilising effect this has on ... A: I was tempted to respond that this is outside my expertise...but I'd like to give some response... ... | |
| PROJECT | 5/26/2006 |
| Q: I need to submit an investigatory project on any topic related to physics in school. I am in grad e ... A: Why don't you study the flow physics of an autorotating flat plate? Simple to construct (just a ... | |
| component nomenclature | 3/17/2006 |
| Q: What's the difference between a PIPE, a TUBE and a DUCT. I already have a leaning, but would like ... A: Fundamentally there is no difference (in my opinion)... but generally as I use them, a pipe is a ... | |
| multiple airfoil aerodynamics | 3/1/2006 |
| Q: what is a tradeoff in replacing a single airfoil with multitude of airfoils of the same performance ... A: Basically the answer to your question is... possibly.... hows that for a straddle-the-fence answer ... | |
| multiple airfoil aerodynamics | 1/25/2006 |
| Q: what is a tradeoff in replacing a single airfoil with multitude of airfoils of the same performance ... A: Sorry for the major delay in getting back to you.... when I first tried to reply the AllExperts ... | |
| shock waves | 4/17/2005 |
| Q: I became interested in shock waves after seeing a picture of an F-14 creating some kind of cloudform ... A: I'm not exactly sure of what you are trying to accomplish here.... propellers on aircraft ... | |
| arrow penetration into a target | 1/22/2005 |
| Q: I will be doing a science fair project on how the mass of an arrow affects its penetrating distance ... A: I don't know of anything specific..... you may look at some archery magazines (where often times ... | |
| aero | 12/6/2004 |
| Q: i would like to seek some information from u if u could help me . i wish to know that im having very ... A: Sure there is a great deal of work to be done in the computational side of aerospace and rocketry. ... | |
| Air Flow around objects | 11/9/2004 |
| Q: How does different shapes effect the flow of air around objects and why is this important in your ... A: As the air goes over (or around) and object, it changes speed and the air pressure changes (if the ... | |
| Airfoil analysis | 10/5/2004 |
| Q: I own a BD-5J Microjet that was built in Australia. The aircraft does not have the original BD-5 ... A: You could measure from the ground up to the lower surface of the wing at some station out the wing ... | |
| compressible flow and viscous heating | 8/24/2004 |
| Q: I have been modeling various geometries that will be exposed to speeds of 550 knots, at 49°C ambient ... A: The fluid viscosity does play a part (in the recovery factor).... The Prandtl number is the ratio ... | |
| compressible flow and viscous heating | 8/20/2004 |
| Q: I have been modeling various geometries that will be exposed to speeds of 550 knots, at 49°C ambient ... A: The adiabatic wall temperature for such a case is approximately (this would be true for a Prandtl ... | |
| Thom rotors | 6/16/2004 |
| Q: Thom rotors seem to be like Flettner rotors with extra discs along the cylinder. How do their lift ... A: Sorry I've been out for a bit.... I'm not well versed in the Thom vs Flettner rotor topic, but I ... | |
| aeronautical engineering? | 6/10/2004 |
| Q: >>>respected sir, i've just passed my 12th board with 64% . sir i am very intrested in doing ... A: If you are looking for high salaries and promotion I would advise you to get the MBA.... MTech ... | |
| Contra Rotating Propeller | 5/23/2004 |
| Q: Respected Sir, What are the advantages of Contra Rotating Propellers? A: Are you a student in aerospace engineering? Many of your questions seem to be largely of a ... | |
| Wing Physics | 3/26/2004 |
| Q: Is it possible to design a wing, so at a given time, it is traveling upwards at the same velocity as ... A: Sure that is possible, it's all based on the amount of lift produced and the weight of the wing ... | |
| Aerodynamics in a wind tunnel | 2/19/2004 |
| Q: My son is doing a science fair project with the question of: Does the shape of a wing on an airplane ... A: Stephanie, I hope you understand but I really will have a hard time answering your question without ... | |
| Paper Airplane science fair project | 2/10/2004 |
| Q: I realize this isn't an extremely technical question, but I need some assistance helping my 6 year ... A: I would suggest using some form of flat surface (like a piece of cardboard) as a launching deck and ... | |
| aerodynamics | 11/16/2003 |
| Q: I am building a Long E-Z kit plane and I am interested in researching the improvement of laminar ... A: Howard, Here are a few references I dug up.... Douglas Aircraft Staff,"LFC Leading Edge Glove ... | |
Aerospace/Aviation
Answers by Expert:
Mark Janus
Top Expert on this page
Expertise
I can answer questions regarding aerodynamics, fluid flow, and computational simulations.
Experience
turbomachinery flow analysis, computational fluid dynamics
Organizations
Mississippi State University
AIAA
SIAM
Publications
AIAA
SIAM
Education/Credentials
Ph.D. in Aerospace Engineering
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