On 05/13/2010 04:16 PM, Chris Maness wrote:
> I am using a math program to simulate the rocket flight. I am see
> that I am getting a slightly longer "burn" time with my sim than the
> sim from:
>
> http://polyplex.org/rockets/simulation/
>
> Do you guys think the force of inertia would add a significant (non
> negligible) amount of pressure to the water at the nozzle? If he has
> included this factor in his calculations of burn time, then I would
> imagine his burn time would be shorter.
without any knowledge of either model it is impossible to know what
might be different in your calculation vs the other calculation.
This seems to be a straightforward problem in newtonian mechanics, but
perhaps with some complications in modeling the fluid flow through
whatever nozzle the rocket has.
Dan