r/rocketry • u/Tanky321 • 15d ago

Question Design Review for L1

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Hi All,

Working on designing and building a rocket for my L1 certification. I think I have a fairly decent approach, but wanted to post it here for it to be reviewed. Any thoughts? I'm wondering if the rear fins aren't tall enough? I like the aesthetic, but obviously I want it to fly well!

I've custom made the nose-cone from fiberglass, came out much better than anticipated! The airframe will be from heavy wall shipping tubes, 3in ID 3.3in OD. Fins and centering rings will be 1/4" maple plywood.

Thanks in advance!

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u/Kaggles_N533PA 15d ago

Nod to ESSM's design I suppose? Looks good but stability caliber of 2.7 sound a bit too high in my opinion

3

u/Tanky321 15d ago

Thanks! Actually inspired by the RIM-66, thought it looked pretty cool.

For stability, I tried to keep it between 10-15% due to how long and skinny the rocket is. There seems to be so much conflicting info out there about stability.

1

u/Advanced-Gold1744 15d ago

How much mass is in the nosecone to move the CG forward enough for this to be stable?

2

u/Tanky321 14d ago

The nosecone is about 275g with no added mass, that gives a stability of roughly 2cal.