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About Dave Combs
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 > Model Rocketry

Model Rocketry - Model Rocketry


Expert: Dave Combs - 6/23/2009

Question
How does weight effect altitude on rockets, and can you give me sites pertaining the answer?

Answer
While it's easy to simply say "a heavier rocket won't go as high", the real answer lies in finding the optimum mass of your rocket. In other words, there is a mass that will cause your rocket to be as stable as it can possibly be. When an outside force like wind acts on the rocket, if the rocket is at the optimum mass, it will react to that force with a minimum of effort, which will increase its altitude (it spends less time straightening itself out and more time going forward).

Here is a pretty good link that will get you pointed in the right direction:

http://www.apogeerockets.com/education/downloads/Newsletter200.pdf

I would also strongly suggest you look at "Model Rocket Design and Construction", also from Apogee. It explains in great detail the theory and mechanics of stability and the CG/CP relationship in model rockets.

http://www.apogeerockets.com/design_book.asp

Good luck!

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