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From: "Alister Yeoman" <
yeoman@voyager.co.nz>
To: "Murphy Rebel Builders List" <
murphy-rebel@dcsol.com>
Subject: Re: Rebel Fuel Flows with O320
Date: Mon, 31 May 1999 08:55:38 +1200
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My tanks where tested when about 1/4 full, they were done again recently at
the 100 hr check, same results. 115 lts per hr individually, whats that in
US gallons? a bit over 25 gals per hour?
I found additional fuel in the tank made very little difference, the most
head is achieved in the drop between the tank and the firewall, obviously,
adding fuel to the tank didn't do much at all to flows.
I couldn't actually tell you what my maximum climb angle is, but one up and
light on fuel it is very steep!
Didn't some of the earlier kits have fuel shutoff valves that needed
drilling out because of flow problems?
Your flows seem a little low, you would need a minimum of 1 1/2 times
maximum engine demand. Say, 70 lts per hour minimum.
I was initially myself a little concerned that a steep angle of climb would
restrict fuel flow to the engine, that is one of the reasons I put inverted
J tubes on my fuel caps to positively vent the fuel tanks.
Even at climb speed there will be a positive pressure in the tanks
maybe 1/2 lb. --some one out will know the correct figure.) and this will
counteract any reduction in head by the increase in angle of climb.
( when pressure testing the fuel tanks for leaks, I found a 2lb pressure has
a head of around 1200mm.)
For the record, I put five fuel drains in, one in each tank, one on each
side at the lowest point and one in the gasculator ( I ducted cold air onto
the gasculator as well) forward of the firewall. I have done about 125hrs to
date and haven't had a blip out of the engine--very reassuring!
Hope this helps.
Alister
-----Original Message-----
From: Walter Klatt <
Walter_Klatt@bc.sympatico.ca>
To: (Murphy Rebel Builders List) <
murphy-rebel@dcsol.com>
Date: Monday, May 31, 1999 1:16 AM
Subject: Re: Rebel Fuel Flows with O320
Alister, how full were your tanks when you got that flow? What is your
maximum
climb angle?
In my tests, I set the plane on an incline to get a 15 degree climb angle.
That's considerably below the 3 point position. With only 1 gal US in each
tank,
I got the following results. One tank open gave me only 12 gph US, while
both
gave me 14.
At cruise level, I got 18 gph US with one tank and 19 with both. There was
an 8
'' difference in "head" between the two positions. I haven't yet tried it
with
more fuel in the tanks.
Alister Yeoman wrote:
Hi there,
Fuel flow is straight gravity, in the three point position I am getting
about 115lts per hour out of each tank individually, which is heaps.
I have positively vented my tanks ( vent into airstream) which will add
more
'head' to the engine.
Cheers
Alister
-----Original Message-----
From: Walter Klatt <
Walter_Klatt@bc.sympatico.ca>
To: (Murphy Rebel) <
murphy-rebel@dcsol.com>
Date: Sunday, May 30, 1999 9:07 AM
Subject: Rebel Fuel Flows with O320
Do Rebels with Lycoming O320's use an auxiliary fuel pump, or straight
gravity feed from the wings? If gravity feed, what maximum climb angle
did you use for your fuel flow test, and what test results did you get?
I am testing mine now, and fear that I may not have adequate fuel flow
with gravity feed at full power and maximum climb angle.
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Archives located at:
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*----------------------------------------------------*
*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
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*----------------------------------------------------*
*----------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*----------------------------------------------------*
