Thank you for your encouragement Kit.My approach to landing damage control is right-sizing chutes :=)
As far as Mach, I doubt a tube fin can punch though. OTOH, it's unclear to me that one must disintegrate when it gets close. The 1.5" BFT survived a J510 which simmed to Mach 1.33.
Ari.
I read somewhere that speeds approaching mach, the tube fins start acting like closed cylinders rather than open ended tubes. The tube fin fragments usually stay attached to the body tube but the tubes themselves basically explode.
You're probably right about my faulty description. I am only a certified rocket monkey (monkey see/monkey do LOL!) and not well versed in aerodynamic theory. The tube fins definitely appear to explode. Over pressure condition inside the tube? I don't know.Closed cylinders don't explode. Tube fins that explode don't behave like closed cylinders, they behave like fins that explode.
Ari.
This 'theory' does seem to fit the aftermath damage we see.
A beautiful presentation to cap off a fantastic achievement; bravo!
Iter, I'm building another 4" tube fin . What length fins do you do ? I have seen 1-1.5 times diameter is best . Mine is 36" tall 4" air frame with one caliber for fins 4", Will go with 54mm and be able to adapt down also I built the nose cone out of foam and glassed .
So there you have it. A rocket that has flown on 7 impulse classes, G to M. It burned a total of 12,467 Ns in one day. This is a rocket that flies on L0, L1, L2 and L3 motors. This is a rocket I can fly at Moffett with a 160 Ns impulse limit, and and one that I can fly on an M in the desert. This is a rocket that you can build for the cost of 2, 3"x48" blue tubes (2x $30) and a LOC plastic nose cone ($20).
All together now, just the liftoff photos.
It might be a couple of years before Leah is old enough to enjoy the desert. It's a long drive, and once you get there, if you get bored of rockets there are few distractions.Very impressive, from the materials used, to the style of rocket, to launching 1 rocket on such a wide variety of engines. The only thing I noticed missing was your little helper.
WOW congrats, , do you used TieBond to glue the fins with this one ?
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