> >Krushnik Effect:
> >I never found a scientific explanation for the effect. It seems to me that
> >exhaust gas velocity must be reduced by some kind of flow effect within the
> >tube. That's my guess anyway.
> My quasi-educated guess would be that the bodytube below the motor would
> behave as an extension to the nozzle. The effect would be the same if you
> made a extra large nozzle for the motor. The exhaust gasses become over
> expanded and thus their velocity drops, reducing thrust.
theoretical variation from a straingt nozzle.
The internal eddies cause the vectors to non-linearize and the resulting
loss of "impulse".
Just tech Jerry
Hey, lets make a 12" motor rocket with intentional gross Krushnik effect
to keep it under the 5000 foot waiver.
Jerry Irvine, Box 1242, Claremont, California 91711 USA
Please bring common sense back to rocketry administration.
Produce then publish.