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Charlie is correct. flew many years with a 1 pint header tank forward of
FW. My rationale was that the fuel got consumed rapidly enough that the
header tank always had cool fuel from tanks flowing into it. That said - I
did have it enclosed in a fiberglass box with air tubes running to it for
cooling. Also had the low pressure “prime” pump adding pressure to it
whenever taking off or landing. I think the 4-6 psi provided by the low
pressure pump had a lot to do with it never causing a problem. Once at
cruise the fuel consumption and cooling effect was such I did not consider it
any risk. In my opinion, take off on a hot day is the crucial test, once with
plenty of airspeed the cooling problem diminishes considerably. Slow and
high power on a hot day is the crucial regime in my opinion.
I always thought that having as large header tank had its own risk.
Yes, it might take a long time to heat up that amount of fuel, but then once
heated you are stuck with a lot of hot fuel in a larger say 2 gallon
header. I recall one unfortunate fatal accident where in my opinion I
think the large header tank contributed.
As we all know fire and fuel are essential ingredients to keep that hummmm
up front going. So stay smart on those decisions.
Ed
Sent: Monday, January 20, 2020 11:20 AM
Subject: [FlyRotary] Re: Fuel System Design for High wing
Aircraft
The holy grail is a returnless
system, to finish out the automotive style injection. :-)
Ed did use a very small header
tank; logic was that the recirculated fuel never stayed in the tank long enough
to begin to heat up. But he didn't vent the header back to either main tank. I
always thought that the unvented header was going to be the cause of his next
'glider' flight. If you add a vent line back to the main tank, it'll work
safely. (My BD4 had a similar system, but for a different purpose; the BD main
tanks had a tendency to unport in uncoordinated flight.)
There are other options, too.
We can talk.
What is the best method for handling return fuel in a high
wing? Fuel return to a small header tank sized to keep fuel temperatures low?
I think Ed Anderson may have used a small header in his RV6.
Asking for a friend with an airplane
addiction.
Bobby
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