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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Tue Nov 16, 2010 1:27 pm Post subject: Oil pressure |
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I purchased two 7.5 gallon 'cans' for the FLO FAST pump... one minute of
cranking and 5 gallons is put out through a rather long hose and up into the
RV-12 filler 'hole.' No lifting. Smooth and convenient....fill up at the
auto gas station, and crank the handle to deliver into the plane. Hose is
long enough for a high wing plane also. I am quite happy with the Flo Fast
'system.' As I recall the two containers plus the hand pump ran around
$250...I could be a bit off on that tho'
FWIW
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flyadive(at)gmail.com
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| Posted: Fri Nov 19, 2010 6:05 am Post subject: Oil pressure |
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Thom & Gaggle:
Speaking from strictly a mechanical engineer point of view:
If the leverage force and the rotational torque are equal the Fatigue Factor goes down with the Rotation Pump since there is a DEAD stop at the Top and Bottom of the leaver pump. Where you must overcome inertia at rest just to start pumping again.
Want to save some more energy? Make the handle longer.
Barry
[quote] I agree that in principle that cranking a full rev can be easier than operating a lever because the mechanical advantage is probably higher. But the crank type is so easy that a little harder should not be too bad. I bought one today and will be installing and trying it out on Thursday.
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Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
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“Everyone is entitled to his own opinion, but not his own facts.”
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Fri Nov 19, 2010 6:29 am Post subject: Re: Oil pressure |
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FWIW
I changed the rotational crank pump for the reciprocal lever pump as per my plan. The lever pump does require a little more effort but it does not pump 9 oz per stroke as advertised. It pumps 16 oz per stroke or 8 strokes per gallon compared to the 16 revolutions per gallon for the cast iron crank pump.
I did not time it but would say that it takes about the same time to pump equivalent amount of fuel, same work being done, just different motions.
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Thom Riddle
Buffalo, NY (9G0)
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