Subject: Fuel considerations --------------Boundary-00=_Z15Y8WA1VA4000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The airplane I fly in my day job gave me an idea for my RV-7 rotary proje= ct. 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 i= n 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.=0D =0D Soo, if it works for Boeing, it should work for a rotary, right? I figur= e in this case, fuel lines would join together at some point with check val= ves 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.=0D =0D Any thoughts?=0D =0D Brooks=0D RV-7 -- Wiring up the EC2 for the engine's first run!=0D =0D Rent our "Sky's Landing" Beach House direct from us and save!=0D Need a vacation? see http://vrbo.com/210620 --------------Boundary-00=_Z15Y8WA1VA4000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

The airpl= ane 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 sophistic= ated electronics nor any active logic at work; there are simply check val= ves in the system that allow the higher-pressure center pumps to push fue= l ahead of the wing tank's pumps. When the center tanks r= un dry, the check valves close from reduced fuel pressure, allowing fuel = from the wings to flow.

Soo, if it works for Boe= ing, it should work for a rotary, right? I figure in this case, fue= l lines would join together at some point with check valves to prevent ba= ck-pressurizing the tank that's not being used. Switching tanks wou= ld be a simple matter of turning one pump on, and the other pump off= =2E For simplicity, I'm only planning on return fuel to one tank.

Any thoughts?

Brooks

RV-7 -- Wiring up the EC= 2 for the engine's first run!

&n= bsp;

Rent our "Sky's Landing" Beach House direct from us and save!

Need a vacation? see http://vrbo.com/210620

--------------Boundary-00=_Z15Y8WA1VA4000000000--