Mark, I was answering to this -
Yes, I believe it was Carl at Flowmetrics that built and successfully
tested that pistol pump. No pulsations either which you might expect.
Ken
I don't know about Flometrics piston pump, can you tell more?
Piston-LESS
A Google search for "Flometrics pistonless pump" will yield a ton of
material with enough detail to build one. It's a clever design. The
pistonless pump appears moderately easy to fabricate.
To me... the downside of the pistonless pump is the requirement to have a
tank of high pressure gas drive the pump (N2, CO2, other). Once the
tank/GSE/etc have been designed, does the pistonless pump offer any
advantage over pressure feeding the propellants? Don't know.
https://patents.google.com/patent/US7611333B1
https://patents.google.com/patent/US7007456B2
--MCS