10-23-2019, 07:14 AM
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BAR
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Join Date: Nov 2005
Location: WI
Posts: 1,847
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Nice set!
Semroc /eRockets has (or had) a BT-70 nose cone with the proper secant-ogive shape. Ah, here it is:
http://www.erockets.biz/semroc-bals...-sem-bnc-70hac/
I used that in a standard BT-70 instead of BT-70H, needed just a little hand sanding for the shoulder.
Then, when you're ready for 2.6", Sandman makes a perfect secant-ogive in basswood. I haven't yet asked him for a 4".
eRockets now has a BT-4 scale cone too! <Edit> I see BarGeezer has posted the MX version - take out the MMT, and makes a nice minimum diameter for Apogee 10mm motors.
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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org
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