Fin size, body length?

[Senior Space Cadet]

Tht

Everyone else is right as well, I just want to add that if you ever do high power, fins like that are a bad idea for a rocket expected to reach transonic speeds due to the likelihood of flutter. No problem at all for low power though.

As for your sim, your overall shape is fine, just make sure you complete the simulation by adding your recovery system, motor mount (if not a minimum diameter), and motor, and make any needed adjustments before you build it.

That's a ways off yet but I do think breaking the sound barrier would be a worthy goal.

 

[Ronz Rocketz]

The Spool rocket flies, just not very well.
https://www.apogeerockets.com/education/downloads/Newsletter352.pdf
Now I’m wondering what would happen if you put an engine in a music stand?

 

[Donnager]

Critique this for me, please?
Obviously a very preliminary design, but is there anything that just glares at you? Too long, too short, fins too small, too large? Or does this look like the start for a sound design?View attachment 423044

Design is very similar to a LOC Hi-Tech or a MAC Radial Flyer. Should be fine.