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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 > foguetes de polvora

Model Rocketry - foguetes de polvora

Expert: Dave Combs - 9/17/2008

Question
qual fomulação do propelente da este

Answer
Typical black powder-based solid model rocket motors use a ratio of 75% KNO3 (potassium nitrate), 15% charcoal, and 10% sulfur.

Model rocket motors are relatively cheap and plentiful, so I would urge you to use commercially-made motors rather than making your own.

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