[AR] Re: Spin.
- From: Peter Fairbrother <peter@xxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 11 Nov 2021 21:02:30 +0000
On 11/11/2021 19:28, Matthew JL wrote:
Spinlaunch is just space guns wrapped in a new package.
A 230gr .45 ACP bullet from a Thompson M1A1 submachinegun has a muzzle
energy of 633J. At 800 rounds per minute that's 8.437 kW.
Allowing for 90% electrical-mechanical efficiency, a Turnigy 5500mAh
4S2P 140C Hardcase LiPo Battery weighing 543g can supply that much power
for 30 seconds plus.
Just sayin'.
Some more BOTE thinking: The force a spinning arm is proportional to the
rim speed, and thus the exit speed of the projectile. How does scaling
it up by a factor of 3 help?
Peter Fairbrother
(on heavy meds :)
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