06-27-2009, 11:22 PM
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BARCLONE Rocketry
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
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Delta IV Medium -- 13mm Version
I said I thought a 13mm version might be forthcoming, and here it is...
The performance on the A3-4T is near perfect, though the delay is just fractionally short - the model is still climbing when the deployment occurs. Dv numbers are OK at about 12 FPS.
I did reduce the fin thickness to 0.035" to reduce some weight. This should not be an issue for 13mm flights, but I'd leave the 18mm version at 0.050"...
The only visible difference is in the smaller engine mount, and the final transition diameter being smaller to fit to the ST-5 tube. It creates a more scale-like taper. A decorative nozzle could be constructed for static display that uses a spent casing to fit inside the tube.
Enjoy!
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