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Old 06-27-2009, 08:38 PM
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CPMcGraw CPMcGraw is offline
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Join Date: Mar 2005
Location: Mobile, Alabama
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Exclamation New Design -- Delta IV Medium

Inspired by the GOES-O launch today...

This is the 18mm version. A 13mm version might be forthcoming...

Uses 4 clear Lexan fins, with tabs, 0.050" thick.

NOTE: This design will require Carl (SEMROC) to cut the special nose cone (BC-1045-D4M) and the solid booster rockets on his fancy alien technology tools. I've tried to get the shapes eyeball-close, so they might need tweaking to get it just right. They're good-enough for me...

The model requires long-delay engines to work properly. Start with the A6-4Q - do not use the A8-5. Move from there to the B6-6, then to the C6-7. Gentle Dv times for these engines.

Enjoy!
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File Type: rkt Delta IV Medium.rkt (68.7 KB, 128 views)
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  #2  
Old 06-28-2009, 12:22 AM
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CPMcGraw CPMcGraw is offline
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Exclamation 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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File Type: rkt Delta IV Medium 13mm.rkt (53.2 KB, 127 views)
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Craig McGraw

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