Page 1 of 1

Spins

Posted: Sat Jan 28, 2017 11:32 pm
by jaquecusto
Why does water spin when it descends ...

Https://www.youtube.com/watch?v=H2maD0-CjnI

... and the rocket turns when go up?

Https://www.youtube.com/watch?v=dLYPPnIpl3s

Very strange, isn`t :shock: ?

Re: Spins

Posted: Sun Jan 29, 2017 6:25 am
by CATO
It is interesting that the effect is so noticeable only a few meters away (either side) from the equator.

Re: Spins

Posted: Sun Feb 05, 2017 8:46 pm
by MattSR
Water spins due to Coriolis effect.

Rockets spin because the guidance systems and fins make them spin for stabilisation reasons. Once you are up high enough, the atmosphere becomes so thin that aerodynamic damping isn't enough, and you either need gyro-driven gimbals or spin stabilisation (which is a form of gyroscopic stabilisation)

Re: Spins

Posted: Sun Feb 05, 2017 8:50 pm
by MattSR
Ah ok - after watching that second vid, its not a spin stabilised rocket - not sure why that one is rotating..