[AR] Re: Turbopump prime mover

  • From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Sun, 06 Dec 2015 09:39:02 +0100

Am 06.12.2015 um 02:20 schrieb Nelson, Erik - 2:

You might not need to mill a flat. If you can see the impeller and it's shiny
enough you might be able to get a usable signal with something like one of
these.

http://www.amazon.com/CyberTech-Digital-Photo-Tachometer-Contact/dp/B001N4QY66

A microphone ( or some other acoustic pickup ) and your PC with a bit of FFT ? )

uwe


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