Hi Fred
Two concerns. One is 1/4" line. A drop of water can freeze and block the line.
Especially at high altitude. The second is that your line must have a downhill
course from the takeoff and cannot fuel or water collect in the down gravity
loop? Again, freezing or friction sound like a problem. (?)
Fred Fillinger wrote:
> 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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