View Single Post
  #4  
Old 06-01-2009, 01:13 PM
Shreadvector's Avatar
Shreadvector Shreadvector is offline
Launching since 1970.
 
Join Date: Mar 2005
Location: Southern California
Posts: 2,188
Default

Estes D12 has 10.21 Newtons of average thrust.
http://www.nar.org/SandT/pdf/Estes/D12.pdf

SOOOO, it all depends on what the actual thrust-time curve looks like and the real mesured average thrust. And, as we all learned from the famous old C5-3 motors, long burn is not so bad if the initial peak thrust is HUGE and the sustainer is decent enough to keep the model from falling out of the sky.

The long burning FSI motors had a problem with the falling out of the sky part.

THe way those motors looked at NARAM-50, I would have guessed they had a pretty decent initial thrust (from a huge dome of burning propellant) followed by a decently moderate sustaining thrust (because of the large diameter and fairly small nozzle).

Once we all see a thrust-time curve we can all know the facts.

In the meanwhile: I'm quivering in antici.......................................Patio n.
__________________
-Fred Shecter NAR 20117 (L2)
Southern California Rocket Association, NAR Section 430
Reply With Quote