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Neil,
This is what I'm doing on my high wing Super Rebel. I put the return line
low so I'm not spraying fuel into the tank. It is the center fitting. It is
about an inch above the pickups. It also gives the fuel some time to cool
off before going back into the pickups. My tech counselor had the same
opinion. The wing is upside down.
Barny
MGDQ 20bt
> Behalf Of Bob Darrah
> Sent: February 12, 2004 7:17 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: EFI Fuel Pressure
>
>
> ----- Original Message -----
> From: "Neil Kruiswyk" <neilak@rogers.com>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, February 12, 2004 5:57 PM
> Subject: [FlyRotary] Re: EFI Fuel Pressure
>
>
> > Scott,
> >
> > You're only dealing with a column of fuel 40" high and not the
> > weight of all 5 gallons. Assuming the return line is 3/8th inch ID
> > (which would be on the big side), 40 inches works out to a grand total
> > of 4.4 cubic inches of fuel, or, a grand total of .11 lbs/sq in.
> >
> > (Did I remember my grade 11 math correctly?)
>
> Close, but no cegar!
>
> The 40 inch high collum is all that counts. Makes no difference if it's
> a
> 3/8" line or 3" line. The pressure at the bottom of the colum would be
> just
> under 2 psi. But the column that applies here is how high above the
> pressure regulator does the return fuel have to go. If you plum it to
> the
> top of the tank, it will have to lift the fuel that high always-very
> consistent. If you plum it to the middle or even the bottom of the
> tank, it
> only has to pump it to the existing fuel level. Sure, it will very but
> only
> by the pressure differential of the vertical height of the tank at the
> rate
> of about 25 inches per psi.
>
> Bob Darrah
>
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>
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