[AR] Re: [AR] Re: [AR] Re: [AR] Re: [AR] Re: [AR] piston pumps and peroxide (was Re: [AR] “Transitioning...)
- From: George Herbert <george.herbert@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Sat, 8 Apr 2023 09:55:10 -0700
On Apr 7, 2023, at 11:36 AM, roxanna Mason <rocketmaster.ken@xxxxxxxxx> wrote:
This is how Rocketlab pumps both stages of its Electron rocket. Rare Earth
permanent magnet motors with Lion batteries in which half the battery pack it
jettisoned during stage one boost. A Coke can sized motor generates 50 HP.
Pretty cool.
Minor detail; on Electron, it’s the upper stage that drops a first battery pack
before continuing to orbit on a second. The first stage has too much upper
stage above it to justify a swap and drop; Mf savings is negligible there. For
upper stage it’s significant.
-george
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