9Sep/11Off
Liftoff Lift
Liftoff Lift
Space Shuttle question?
I am building a model rocket of the Space Shuttle, and I want it to liftoff like the real space shuttle with the 3 tanks. I'm doing research and I find that having 3 or 4 fins is best for rockets. My question is, "why does the space shuttle does not require 3 or 4 fins for lift off?"
The space shuttle's main engines are mounted on a gimbal; so the thrust is steerable, either manually by the pilot or automatically by the on-board flight computer. In fact all of NASA's launch vehicles since the Mercury days had gimbaled thrust and no fins.
On very small rockets, like your models, the engine is fixed in place so the the thrust cannot be steered to provide stability. Instead, vehicles like these use fins; the force of wind resistance again the fins keeps them flying straight. Two fins can stabilize the vehicle on one axis, but you need at least three to stabilize two axes. Four is good too. (Five or more would be overkill.)
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