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all of the htpb has been spoken for. Gerald

I have about 10 gallons of htpb (Firefox R45M) that I want to get out of my shop. I can bring it to balls 30 for pickup (not planning on shipping any so please don’t ask). Great price, PM me. Gerald

Not hot in NM in may, bring a jacket for the evening

FWIW I used system 3 t88 structural epoxy on the fin roots and filets were proline 4500. I fiberglassed tip to tip with west systems after "painting" the outer 1/2 inch of the fins with proline 4500. Heat issues will mostly be the fin edges and any protrusions from the body tube and the tip...

You need to setup the recovery parameters in OR and you'll get the right numbers, see this all the time. OR is better at transonic in my experience. Yesterday I flew my Tomach 54mm and OR simmed at ~ 19k ft while RS simmed ~ 16k ft. Actuall was 19147 ft by gps altitude and 18886 by baro...

Depends on the weight of the components and drag. Added weight usually culprit. Friction fit works just shear pins have a much higher success rate.

Personal preference for sure, I use shear pins for both the nose and the middle. Seen too many drag separations and the resultant carnage.

enjoy, I launched my 54mm min dia tomach today and hit 18,000+ and Mach 2 on a k1440!

Yes, Thanks for the recognition. I know of lot of folks here are Veterans like me and I just want to say thanks to each and everyone of you for your service not to mention your families for their support as well. Thanks! ETC(SS) retired

A bird in hand is worth two in the bush so to speak, I'd go with the 38 mm unless you have future plans for the 54 mm hardware in which case it wouldn't hurt to acquire it now. See how this hobby can really suck you in!