First off, thanks for the reporting on the recent KISS flights. Mixed
success but hey, you guys went out there and flew a home made experimental
rocket. Achievement in itself.
When I read that the fins failed I paid closer attention to the fin design
as far as I could see it in 'before' pictures. This made me wonder why such
a conventional, low speed fin was chosen. I'm no rocket specialist but I do
believe in the old school philosophy "if it looks fast it will go fast". If
I was to build a rocket that was going to go close to Mach 1 I would have a
fin that is much more swept backwards. Why was a relatively straight fin
chosen? Does this have low speed advantages? Perhaps fins that are more
swept really are not more resistant to high speed flight for the same
surface area compared to straighter fins?
Examples of fin shapes I would consider are on the PML website like the
FIN-A-09 FIN-B-04. Of course I'm not at all influenced by the fact that my
PML Eclipse has 09 model fins :-)
Thanks,
Sander
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