Snip
> > > From: "Ed Anderson"
> > > Date: 2004/08/04 Wed AM 07:16:02 EDT
> > > To: "Rotary motors in aircraft"
> > > Subject: [FlyRotary] Re: May not work above 8000 MSL was [FlyRotary]
> > > Re: Oil injection, and more
> > >
> > > You may be correct, Al. Without testing it would be hard to say.
> > >
> > > No question my theory could be wrong - but as you say something must have
> made Atkins come to the conclusion that the metering pump does not work above
> 8000. If his claim is valid - then there must be some cause related to
> altitude. The only part of the fuel metering system that would be affected by
> altitude that I can see is the oil feed from the shaft boss to the pump.
> > >
> > > We know that as pressure changes across an aperture will cause the flow
> rate to change - whether (as you point out) the difference due to altitude is
> significant enough to account for any lessening of oil flow is the question.
> Whether or not a few pi would ensure adequately flow sufficient CCs of oil will
> depend on the size of the orifice through which the oil flows. I agree if the
> aperture is sufficiently large then a few PSI change in pressure will make
> little (if any) difference in flow. However, if the orifice is small and the
> flow barely adequate to meet the needs say at 14.7 psi then 11 psi could lessen
> the flow. Not claiming that flow would cease, but it may well be diminished.
> > >
> > > My 0.02
> > >
> > > Ed 

Snip
 
> What about the vacuum of the rotors drawing the oil into the chambers? That
> happens at any altitude.
> Marc Wiese
> 

  Very good observation Marc! Isn't the rotor tip seal  past the oil injection jet

in the rotor housing before compression of the intake charge begins? IMHO

 

Kelly Troyer