Along the same lines, I have the Mk 1 setup with the fuel fill on the
top, but no sight gauge. I ran the vent line (1/4" nylon) up to the
area of the fuel filler, where there's a check valve at that high
spot, and thence back to the vertical fin via a T-fitting water trap,
accessible through the access panel for the trim servo. The actual
vent is a chunk of 1/4" ali tubing floxed into a hole in the fwd face
of the fin.
The check valve is a nylon T-fitting, with the hex fitting on one end
plugged with epoxy except for a vent hole, and a little ball bearing
and spring from the junk box. Turn the nylon fitting and adjust the
unseating pressure. Its purpose is to relieve any vacuum in the tank
should the vent line become plugged downstream. The fin location
provides pressurized air in flight. The motivation was this aesthetic
thing I have concerning an antler poking up from the fuse top. Should
work, no? Yes? Elegant even? :))
Regards,
Fred F., A063
"Bob.Harrison" wrote:
>
> Good Ideas?
> Yes. Put the vent pipe into an anti-siphon bottle in the roof and finally
> vent to atmosphere by passing a vent pipe from the high side of this bottle
> down the PORT SIDE through the Flap Drive slot. ie:- no external vent pipes
> to knock, any overflow discharges onto the ground and no vapours near the
> filler. Approved by the PFA on my schematic drawing .
> Regards
> Bob H G-PTAG
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