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Brooks,
Returning
to a single tank is not a great idea. One day, flying along, fat, dumb
and happy, you’ll forget you’re draining from one tank and filling
the other till it over-flows and you send your liquid gold overboard, out the
vent (Ask me how I know…) Best case, you’ll have gas
stains all along the fuselage. Medium case, you’ll smell gas in the
cockpit and suck up a seat cushion wondering what broke. Worst case, you
won’t have fuel to make you destination.
Andair make the perfect solution with their FS20-20 Duplex Fuel
Selector. Send the fuel back to the tank that it came from. (You
need to keep it simple for the stupid pilot.) No check valves to hang up.
Then like all other RVs flying, you run an hour on one tank, switch, run an
hour on the other and back and forth.
Neil
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Brooks Wolfe
Sent: Thursday, November 06, 2008
11:42 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Fuel
considerations
The airplane I
fly in my day job gave me an idea for my RV-7 rotary project. This
airplane requires the center tank to be burned first, then the wing tanks may
be used. To accomplish this, there are no sophisticated
electronics nor any active logic at work; there are simply check valves in
the system that allow the higher-pressure center pumps to push fuel ahead of
the wing tank's pumps. When the center tanks run dry, the
check valves close from reduced fuel pressure, allowing fuel from the wings
to flow.
Soo, if it works
for Boeing, it should work for a rotary, right? I figure in this case,
fuel lines would join together at some point with check valves to prevent
back-pressurizing the tank that's not being used. Switching tanks would
be a simple matter of turning one pump on, and the other pump off.
For simplicity, I'm only planning on return fuel to one tank.
RV-7 -- Wiring up
the EC2 for the engine's first run!
Rent our
"Sky's Landing" Beach House direct from us and save!
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