ORIGINAL: Cyclic Hardover
You could design the back end of an F-20 to hold a couple "D's" and never even see them. You know, I could design the back end of an F-20 to hold a coupl e of "D's" so I would never even see them.
Or bigger.. bigger is always better!
D's are only 24mm diameter, the BT-50 mounting tube is 0.976" OD. Plus when you feel like blowing a few extra bucks you can buy composite-propellant E's that fit in the same space. Or Estes E9's which are 3/4" longer than the D's. F's and G's are normally 29mm/1-1/8" OD , and the mounting tubes are about 1.25" OD depending on whose brand.
While we're vaguely on the rocket subject, here's a shot of a launch we did last year in Alberta.. the rocket is 10 feet long and weighs 117 pounds, the motor is 6.3" OD with 40 pounds of propellant. Broke mach 1 at 1.7 seconds, peak acceleration 21 gees, reached mach 2.4 and climbed to 44,006'. The rocket was built by a cohort in CA, and I designed and built the motor, as a production prototype (and for fun). For rocketheads, the motor is a full O class "O6800" which at the point of liftoff here is producing about 1,850 pounds of thrust. That's a tad too high for a .90 powered F-20 I'm afraid.
The last shot shows the paint stripped off the nose cone by dynamic pressure. The stainless steel tip was okay though.
Hmm, getting a bit off topic, but hey pyrotechnics are cool and we were talkin' rockets so why not.
MJD