RKeller
Well-Known Member
- Joined
- Jul 31, 2014
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I'm working on a DIY 3" glass kit and could use some help with the fin design. the kit I got came with 3/32 fin stock. I'm starting to wish I had upgraded to 1/8". nothing is cut yet so now is the time if I need to. basic specs,
Nose - 3" 5:1 Ogive with Al tip.
Payload - 16"
Booster - 36"
MMT - 54mm 12"
I have 6" x 36" 3/32" thick fin stock
I'm wanting to build a nice all around flyer, which is why I originally went with the 3/32 but open rocket is showing right around mach 1 with a K motor. I've started messing with finsim and so far I'm showing flutter right around mach 1 with both designs. not sure I'm using finsim correctly yet either. here are my current fin designs although I'm favoring the 2nd one at the moment. I'm looking for recommendations on how to design the fins so they won't flutter as well as recommendations on stability for transonic flight.
1st design, 3 fins
2nd design, 4 fins
Nose - 3" 5:1 Ogive with Al tip.
Payload - 16"
Booster - 36"
MMT - 54mm 12"
I have 6" x 36" 3/32" thick fin stock
I'm wanting to build a nice all around flyer, which is why I originally went with the 3/32 but open rocket is showing right around mach 1 with a K motor. I've started messing with finsim and so far I'm showing flutter right around mach 1 with both designs. not sure I'm using finsim correctly yet either. here are my current fin designs although I'm favoring the 2nd one at the moment. I'm looking for recommendations on how to design the fins so they won't flutter as well as recommendations on stability for transonic flight.
1st design, 3 fins
2nd design, 4 fins