dsbarno wrote:

Any idea on what would be  the best location for the crossover on a high
wing aircraft in relationship to chord and depth of tank.  Would 3/8 be
large enough? Planning on something flexible.  Putting 40 gallons on
each wing, one tank, with a single return line to one tank. Thinking
about putting return line above feed line about 2/3 of the way up in
depth on right wing. A 20 b engine.  Thanx

Barny

I am guessing but .11 square inches  is the area for 3/8 so 1/2 
with an area of .2 if you can handle it. Radius the openings that 
go into the tank if you can.
I would say near the back and bottom of the tank so you would get good 
cross over in a climb and at modest angles of attack during cruise. 
Perhaps two 3/8  would be easier. One at the front of the tank and 
one at the rear. In straight and level they both should flow.

BTW there is no real reason why you can not make them into a large
U shape and run them down the inside of the cabin, under the floor
and up the other inside. A water drain under the cabin in the U would 
be ideal. The return line could T into it at the bottom.
This would save some cabin head room in a strut braced high wing
configuration.
 
Paul Lamar
 
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