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Old 09-16-2007, 10:39 PM
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CPMcGraw CPMcGraw is offline
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
Exclamation New Plan -- Say Cheese

To inaugurate this thread with the first new plan we have the Say Cheese, which as the name implies, is a Camera Ship. It has been trimmed to reach 800' consistently on a D12-5, and is intended to fly the Aiptek Mini Pen like TBZEP uses in his modified Stormcaster.

The starting point for this design is a Screamin' Mimi, with the main tube cut into 12" and 6" lengths. To save weight, I used a simple 0.07" thick matteboard bulkhead and a tube coupler instead of a solid balsa bulkhead to join the payload body to the booster body.

Fins are standard 1/8" thick balsa.

A 48" x 3/16" rod is needed to reach a safe flight speed. The camera is listed as 45g, and I allowed 50g to account for the needed padding and support. With that much mass to move, even the reliable D12 can't push hard enough to get it off in less than 38".

Length: 25.75"
Diameter: 1.637" (BT-60)
Fin Span: 4.13"
Weight (with camera): 5 oz
Weight (without camera): 3.25 oz

If you fly the rocket without ballast, you will need to reef the parachute shrouds, as the Dv is above 25 FPS. The unballasted altitude is over 1030', or 330' better than with the camera. Use the 48" rod for unballasted flights as well.

Enjoy! And, if you build it before I do, you're obligated to share some in-flight videos!!!
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Craig McGraw

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