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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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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#2
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Quote:
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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YORF member #11 |
#3
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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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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#4
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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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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#5
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Fin Sheet
Here's the fin sheet pattern.
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#6
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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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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
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