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Old 11-21-2006, 11:18 PM
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CPMcGraw CPMcGraw is offline
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
Exclamation New Plan -- Cherokee 38

I spotted the nose cone and body tube on the SEMROC website, and thought I'd toss an old favorite together to see what could be done. Mercy!

This is a 1.885X upscale of the long-body Cherokee-D, using Carl's BTH-70 tubes and his BNC-70HAC nose cone. The fins are TTW G-10, 1/8" thick. I used the LT-150 tube for the motor tube.

Length: 43.16"
Diameter: 2.497"
Fin Span: 11.377"
Weight: 28.70 oz

H123W-10......3033'......Dv 19 FPS......36" x 1/4" launch rod
H153-13.......3775'......Dv 25 FPS......36" x 1/4" launch rod
H45W-10.......4898'......Dv 17 FPS......60" x 1/4" launch rod
I125R-14......5514'......Dv 14 FPS......36" x 1/4" launch rod
I211W-14......5902'......Dv 8 FPS.......36" x 1/4" launch rod
I195J-14......6015'......Dv 11 FPS......36" x 1/4" launch rod
I240-15.......6616'......Dv 10 FPS......36" x 1/4" launch rod

The last motor in the list -- the I240-15 -- pushes the model to 1167 FPS, which is greater than Mach 1 at 70 degrees F. Now, only an experienced HPR builder can tell if this design would even hold up to that stress if built lightly, the way RockSim would expect it to be. I make no predictions beyond what the simulator suggests it could do. This is a genuine "what if", and I only offer it as a possibility.

Enjoy!
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