ScrapDaddy
Well-Known Member
- Joined
- Jan 26, 2010
- Messages
- 2,083
- Reaction score
- 4
The pendulum rocket fallacy is a common fundamental misunderstanding of the mechanics of rocket flight and how rockets remain on a stable trajectory.
Strike two. (Hint #3: Look at where the motor nozzle is located on the rocket. Anything unusual about that? If you don't know where the motor nozzle is, look up the rocket - called Goddard's first liquid-fueled rocket of March 24, 1926 - on Wikipedia or some other source.)Gimblized stability ?
BINGO! (...and the crowd goes nuts... ) What is wrong about it?PeDulum rocket fallacy!
Yes, obviously, but somehow that principle didn't work for Dr. Goddard in March, 1926.Mark
The basic criteria for stability it that the CG be ahead of the CP.
In the Fliskits Nell this is fairly easy because the motor is at the forward end of the focket and the aft end is draggy. This is the same type of stability you have with a bottle rocket, or simply a rocket motor on a stick.
Bob
Yes, obviously, but somehow that principle didn't work for Dr. Goddard in March, 1926.
Mark K.
That's because the fuel was in the back in Goddard's, making the back end of his rocket much heavier than the back end of any model. This moved the cg back far enough to cause it to be very marginal on the stability.
Yes, obviously, but somehow that principle didn't work for Dr. Goddard in March, 1926.
Mark K.
Enter your email address to join: