Search found 5 matches

by Jim-K
Sun May 17, 2020 12:18 am
Forum: Scratch Built
Topic: Running in the 90's - my Aeronaut Project
Replies: 18
Views: 2915

Re: Running in the 90's - my Aeronaut Project

Just a couple of machining notes - you look like you know what you’re doing but I’ll add them anyway: - Have you considered abrasive water jet for flat material? Better machines can 5-axis the cutter head angle. - Think of machining carbon as abrasion rather than cutting. Diamond encrusted, carbide ...
by Jim-K
Sat May 16, 2020 11:55 pm
Forum: Scratch Built
Topic: Countersinking radial holes
Replies: 4
Views: 327

Re: Countersinking radial holes

What are the loads you are looking to react with the fasteners?

From memory, the remaining cylindrical bits of the holes do the work rather than the conical bits. Do your fasteners work hard, or could you work with smaller ones? You might get away with counterbores rather than countersinks?

Jim K
by Jim-K
Fri Jan 10, 2020 1:13 am
Forum: Scratch Built
Topic: Thunderbird 3 Build
Replies: 12
Views: 2256

Re: Thunderbird 3 Build

I’d be careful of the forum rules. I’m pretty sure that “combination chemical and ion propulsion” powered by “fusion reactors” will count as experimental rocketry. :shock:
by Jim-K
Wed Jan 08, 2020 11:34 pm
Forum: Scratch Built
Topic: Modular Rocket
Replies: 4
Views: 1748

Re: Modular Rocket

Starting at the top for no particular reason, I have a nose cone assembly. This assembly is just going to pop off the top with the ejection charge on the end of the motor. The typical nose cone (this one was from Apogee) will do this without modification, but the inner BT-70 does not suit the BT-80 ...
by Jim-K
Sat Nov 16, 2019 12:08 am
Forum: Scratch Built
Topic: Modular Rocket
Replies: 4
Views: 1748

Modular Rocket

With the summer warming up and no flying until April/May, I have started to tinker with a modular rocket design. My aim is to make different sections that can be stuck together to mix and match different motors, recovery, staging etc. So far, I have 3D printed some ends and tried our a few prototype...

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