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   Re: Ed Sikora's question about locations of fuel sensors in the
header tank. I am planning to install two optical sensors to control the
transfer circuit and my present plan is to put them at one and two
inches from the top of the tank. I have measured the tank capacity and
liquid depth up to six gallons (the maximum the tank will hold without
being bonded against the forward deck, and calculated the quantities for
levels from there to the top. Came out with a nominal 11 gallons
capacity. The one inch sensor will turn the pumps off at 10.15 gallons,
while the two inch sensor will turn them on at 8.75 gallons. If I drop
the lower sensor down a quarter inch to 2.25 inches, the pumps will turn
on at 8.25 gallons. This is theoretical, of course, but I'm going with
it. If a problem develops with pumps turning on and off rapidly in
turbulence, in spite of slosh baffles in the header tank, I can always
add a time delay in the curcuitry that turns the pumps on.
   On the other subject, I discovered my 320/360 SFB outer wing panels
have no air vents in the D-section, the closed leading edge forward of
the main spar. There are four ribs, giving three unvented compartments.
I can use a drill on a long extension to reach in and put a hole in the
interior ribs, but don't know how to seal the honeycomb exposed by that
hole. Perhaps that isn't a problem. How did other SFB builders handle
this?
                                           Charles Keller

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