Elon -- Piston friction where there is a plain oil film present is roughly
proportional to speed. Add hydrodynamic films and that throws the
proportionality off. This is pretty much the case whether it is a piston
traveling axially in a cylinder or a ring "gear" rotating in a geroter pump
outer housing. The geroter gear is far more predictable in the ability to
develop a hydrodynamic film so can be expected to be more effficient with
respect to friction.
Ed
----- Original Message -----
From: "Elon" <saltfever@comcast.net>
To: <neil@dbelltech.com>; <drmayf@mayfco.com>; "'Ed Weldon'"
<23.weldon@comcast.net>
Cc: "'land-speed submit'" <land-speed@autox.team.net>
Sent: Friday, January 02, 2009 7:05 PM
Subject: Hydraulic Hybrids
Ed thanks for the good info. Am I to assume that piston friction does not
increase with rpm?
Neil I remember that experiment but I think it was done with Kevlar. I don't
think carbon filament was invented at that time. I remember it as "proof of
concept only" and since it was successful there was no need to continue.
-Elon
-----Original Message-----
(Snip . . .) It supposedly had a carbon fiber "fiber" flywheel running in a
vacuum chamber. . . . Neil.
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