I did a similar system on my ASH26e. Be aware that tubular composite kite
spar material is available in many nesting diameters. So you don't have to
use a brass or other metal outer tube. A larger composite tube is both
lighter and will glass in better. The you can use a smaller kite spar tube
for the stiff pee tube to extend out.

If the larger tube is installed at an angle aft, then there's no need to cut
the end of the extended tube at an angle to insure suction.

If the larger tube ends at the seat pan, and in an area that's hard to see
due to the seat cushion (like just aft of the stick), then you can install a
guide "V" to make it easy to install the smaller extension tube in flight. I
did this using a V made of stainless steel welding rod fixed to the seat pan
with some UHMW polyethylene tape.

If there's interest, I can post some pictures to the glider forum on this.

bumper
"Glen Kelley" wrote in message
...
Hi,

I have a system in my PIK-20 that works very well. I installed a brass
tube that has the appropriate ID to slip over a carbon fiber aerrow shaft.
I drilled a hole in the fuselage floor behind the stick and through the
outside of the aircraft. I then epoxied the brass tube in the hole and
cut to be flush on the bottom of the aircraft and the seat floor. One end
of the arrow shaft is cut at a slant to create suction in the airstream.
The other end of the arrow shaft is glued into a model airplane fuel bulb
(looks like a turkey baster bulb, but has a much smaller opening at the
bottom. You will have to size the arrow shaft so that you can insert into
the brass tube with the canopy closed. In my ship, this results in an
arrow shaft that is 20" long. The rear of the fuel bulb has a hole cut in
it to provide a friction fit (seal) around your willie.

When done, I flush it with a little water put a piece of paper towel in
the opening, and stow the assembly. Oh, And I use a bit of mylar over the
exit hole so that the hole is sealed unless the arrow shaft pushes the
mylar out of the way.

Works great - no muss, no fuss, no catheters and no yellow stains anywhere
on my ship.

Glen Kelley
"KP" wrote in message
oups.com...
Hi All
Like to install a relief tube system in my ASW-27 and looking for some
ideas.

Ken (KP)