I remember a write-up in American Rifleman (I believe it was) in the mid 1960's. I thought about it recently and just did a Googl search and voila! http://en.wikipedia.org/wiki/Gyrojet

http://www.youtube.com/watch?v=HoffTmg9bxU&NR=1

I wonder if one could make a hybrid in which the initial acceleration is overcome by small external explosive charge while the rocket begins it's initial ignition and acceleration.

Yeah I remember watching that History channel show awhile back. It sounds like an invention that was trying to solve a problem that doesn't exist.

Isn't this how the H&K P11 works?

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Been tried,"secondary projectile acceleration"or something,as my gun friend told me.

Essentially the initial impulse is the governing force.Any additional impulse would,of necessity,screw up the initial spin of the projectile.Robert Parker Parrott designed such a projectile but found it was unreliable.

Wow. That’s pretty cool.

But, you know me….I was actually hoping from the thread title that this was about firing up some new jet propulsion system.

__________________
1980 300D - Veggie Burner !