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2mm has been sufficient in my experience, but I wasn't sure whether it would be sufficient for a more powerful motor. I guess I could always put a couple of internal "reinforcement-rings" in if necessary. I am using 3D printing as part of the project. I'll see if I can use PETG, but if I have to...

Is it a bad idea to design a minimum diameter F-class rocket? My concern is the structural integrity of the rocket. I intend on 3D printing (PLA) it with a wall thickness of about 2-3mm. Does anyone have any experience with 3D printing minimum diameter mid-power rockets? Thanks

That's right, there isn't a motor in the second stage - intentionally. I wanted to see if ditching the motors/firststage immediately after burnout would result in higher altitude because there is no longer any thrust.

The two files below are a couple of designs I made in Open Rocket. What I don't quite understand, is that the single stage version reaches a higher altitude than the two stage version. I understand that the two stage version has extra drag due to the additional set of fins to maintain stability...

Thanks for the help guys, I think I'm set on my way now! I've uploaded my revised model which has been improved significantly. Due to the fact that I am going to be modelling the rocket in a CAD system, I won't get too caught up in much more detail since I have no idea what design changes I'll...

Sorry I didn’t explain that well, I meant “am I doomed to staying under 100m” as in I’d like the rocket to exceed 100m. I am trying to figure out if there is any rocket design that would allow that with 3 or 4 B6-4 engines and PBA structure.

Hmmm, I see, so weight is the primary issue. Since I am doing this through a university club, I am actually required to 3D print the rocket with PLA (~1.25g/cm^3) and a minimum width of 2mm. Does this mean that I am doomed to exceeding 100m?

Thanks for all the helpful responses!!! It seems like my best bet is to start familiarising myself with Open Rocket. I have attached a design that I spent today making. Disappointingly, it's only predicted to reach an altitude of <70m even with 4 B6-4 engines. With 3, it's significantly less. I...

I am designing a model rocket and am using 3 B6-4 Engines. Inevitably there will be perturbation of its trajectory by wind and engine/thrust inconsistencies. The way that I currently understand the Centre of mass (CM) and Centre of pressure (CP) in terms of correcting an altered trajectory, is...