Fuel Wing Tank Vent Improved #127

Wing tank vent re-routed, to copy the S6 design.

Used only occasionally for longer flights my smaller version (of the two overhead types known of in the U.K) can readily take 15 litres of petroil, but I do know I then lose some through the vent pipe.

However, even using a lower fill to only 12 litres in December 2011, after an hour's flight I opened the connecting tap to drain it down to check it out. It eventually delivered 10L into my calibrated behind the seat fuel tank. Approx. 2 litres of costly fuel had gone AWOL.

I still blame loss in flight - when the fuel swills around in that rather flat tank - via the standard low level neck side vent pipe connection. It connects to a flexible pipe running down to the fuselage bottom centre slot,  to let fumes out safely.

I looked at the Rans S6 method for the forward facing wing tanks cap mounted vents and copied it with a length of copper pipe. The stub pipe off the S4 filler upstand is now hard plumbed with a short flexible tube to a copper inverted 'J' held firm by a jubilee clip. [Round the tank neck, just below & hidden from view under the centre wing top fabric cover].