Variable twist rate barrel for projectile stability testing (not gain twist)

[MJP]

"10,000 RPM; forwards, or backwards respectively.  This is fast in the grand scheme of things, but not fast for a precision lathe; or even a compared to a car engine cam shaft."

Well for the start cam shaft turns at half the engine speed so 10krpm cam speed is very fast as the engine will be turning 20000rpm
Just something I noticed.

Sealing the breech to spinning barrel will be challenging I bet. But interesting concept at least.

Marko

[subscriber]

Good points, Marko.

[E30_S50]

For testing purposes, you could maybe even use powder for your propellant...like .22 blanks or something. Then your seal won't matter too much. You would probably want to have a controlled way to bleed off even more pressure so you could control speed.

[subscriber]

Thinking outside the box, Matt; or the barrel