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  #1  
Old 11-15-2010, 10:57 AM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
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Exclamation New Design - Bee-Thirteen

Another "Schoolyard Sounder". A simple two-stage design for 13mm engines.

Length: 17.50"
Diameter: 0.908" (ST-8)
Fin Span: 3.71"
Weight: 1.30 oz

The only engine combination recommended is the A10-0T to 1/2 A3-4T. Reaches safe flight V on a standard 36" x 1/8" launch rod.

Average altitude is 420'. Average Dv is 17 FPS. Recovery is via 10" parachute (a SEMROC 12" parachute, cut down to 10").

Enjoy!
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Old 11-15-2010, 11:39 AM
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Doug Sams Doug Sams is offline
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Quote:
Originally Posted by CPMcGraw
Another "Schoolyard Sounder". A simple two-stage design for 13mm engines.

Diameter: 0.908" (ST-8)
Craig,

I like this for the same reasons. A ~1" diameter 2-stager on T motors is well suited for small field flying. I've come close to cooking up something like this before. Then I realized, I already had one - a Midget. Several, in fact

BTW, using your Rocksim file, I get a dv of 11.5ft/sec using the A3-4T as a sustainer. Altitude is less school-yard-friendly at 642', but it seems like a reasonable motor option, space permitting.

Doug

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Old 11-15-2010, 12:25 PM
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Nice one. Getting ready for the "coming soon" reintroduced A10-0Ts, eh? I probably have everything I need to build this one on hand.....
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  #4  
Old 11-15-2010, 05:42 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by Doug Sams
Craig,

I like this for the same reasons. A ~1" diameter 2-stager on T motors is well suited for small field flying. I've come close to cooking up something like this before. Then I realized, I already had one - a Midget. Several, in fact

BTW, using your Rocksim file, I get a dv of 11.5ft/sec using the A3-4T as a sustainer. Altitude is less school-yard-friendly at 642', but it seems like a reasonable motor option, space permitting.

Doug

.


I seem to be getting higher Dv's on my runs, anywhere from 20 FPS up to 36 FPS. The test with the 1/2 A3-4T gave me the Dv range I liked, so I kept it.

Also, an early test was using a 1x24 streamer, so the altitude risk could be reduced.
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  #5  
Old 11-15-2010, 05:46 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by BEC
Nice one. Getting ready for the "coming soon" reintroduced A10-0Ts, eh? I probably have everything I need to build this one on hand.....


Yeah, been wanting to do two-stagers for a long time, just not with B6 or C6 power. BARCLONE Field is a nice schoolyard; most in this county don't have anything nearly as large and as open as this one.
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  #6  
Old 12-26-2010, 01:42 PM
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CPMcGraw CPMcGraw is offline
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Default Fin Sheet

Here's the fin sheet pattern.
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