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Old 11-25-2006, 09:00 PM
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CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
Exclamation Cherokee 38 -- REVISED

Quote:
Originally Posted by Carl@Semroc
Thanks! The web site has been corrected. The correct diameter is 2.247"...


And now the model has been corrected to show the adjustments. I changed the model to use a P6 Altimeter and the CPR2000 parts kit. The mid-body coupler is now sealed at both ends with 1/8" AC plywood and holds the altimeter and the deployment charge kit. Imagine the model to still deploy from the nose, but it should separate at the coupler for prepping and maintenance, using screws to hold everything together. You can use up to 12" long motors, either reloadables or single-use types in the mount.

Any additional components required will affect the results, but probably not by much unless we're talking several ounces.

Length: 43.16"
Diameter: 2.247 (BTH-70)
Fin Span: 11.13"
Weight: 22.02 oz

All motors have NO delay charges, and NO deployment charges. Deployment is at apogee, controlled by the P6 altimeter. The list below is not exhaustive, but is a sampling of the better-performing motors when comparing altitude with Dv numbers.

G61W.......1786'......Dv 0.31 FPS......48" x 1/4" launch rod
H123W......3618'......Dv 0.32 FPS......36" x 1/4" launch rod
H45W.......5691'......Dv 4.81 FPS......48" x 1/4" launch rod
I211.......6180'......Dv 1.32 FPS......36" x 1/4" launch rod
I285.......6462'......Dv 0.05 FPS......36" x 1/4" launch rod
I435.......6479'......Dv 0.08 FPS......36" x 1/4" launch rod

Recovery as-shown is single-stage, with a 54" parachute.

Enjoy!
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