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About Dave Combs
(Top Expert on this page)

Expertise
Can: Nearly all low-power and some high-power rocketry questions. Can't: Anything that approaches violations of NAR/TRA safety codes; advanced high-power rocketry questions beyond L1 (I'm still learning those myself).

Experience
NAR Level 1 high-power certification; BSA Space Exploration Merit Badge counselor; many years of experience in building and flying rockets from mini-motors (A3-4T) up to H impulse.

Organizations
National Association of Rocketry; NAR Section 703 TORC in Dayton, OH.

Education/Credentials
None specific to rocketry.

   

You are here:  Experts > Science > Science/Nature for Kids > Model Rocketry

Questions Answered By Expert  Dave Combs 
In Category  Model Rocketry

SubjectDate Asked

attaching fins10/10/2009
  Q: I'm a middle school teacher who is starting a rocket club at my school. I have been building a ...
  A: First and foremost, CONGRATULATIONS and well done to you for starting a rocketry club at school! ...
Hey7/30/2009
  Q: I was wondering, where can i buy cheaper A6-4 rocket engines? I love to launch rockets but its ...
  A: A6-4 engines are only produced by Quest; this makes them a little harder to come by (Estes BY FAR ...
Model Rocketry6/23/2009
  Q: How does weight effect altitude on rockets, and can you give me sites pertaining the answer?
  A: While it's easy to simply say "a heavier rocket won't go as high", the real answer lies in finding ...
Hey6/19/2009
  Q: I was wondering, where do you buy A6-4 Rocket engines? Cheaper Online its around 5.50-6.00$ Where do ...
  A: 1. They will usually be cheapest online, even after shipping cost is included. 2. Quest is the only ...
Starter6/16/2009
  Q: hey! I'm starting model rockerty And i was looking at some rockets and stuff This is what for sure I ...
  A: First, let me say I'm glad you're getting into the rocketry hobby; you're going to enjoy it. The ...
a multistage cluster rocket3/10/2009
  Q: I have been flying single stages with my kids recently, and have even designed a couple of ...
  A: You ask a number of good questions. I'll try to break it into parts. First, for the pertinent ...
3 Vs 4 fins3/9/2009
  Q: Im just trying to figure out whats better about using 3 fins and whats better for using 4 fins.
  A: The simple answer: There really isn't much difference. The complex answer: The purpose of the fins ...
foguetes de polvora9/17/2008
  Q: qual fomulação do propelente da este
  A: Typical black powder-based solid model rocket motors use a ratio of 75% KNO3 (potassium nitrate), ...
painting rockets4/6/2008
  Q: i am not sure what is the best type of paint to use on model rockets? enamel or acrylic? thank
  A: The quick answer is that spray enamel is the easiest paint to work with. You can get any number of ...

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