On Thu, 25 Jan 2007 22:40:23 -0500, in ,
Morgans wrote:
If you were to use a small vent tube in addition to the flow tube, that
would eliminate the backup problem. It is just another point of
leakage, so to speak.

Of course, some of have aircraft with canopies, so theoretically, all we
need to do is slow to an acceptable speed, slide back the canopy, and pee
off the side... grin

Come to think of it, drilling a hole in the floor and running a tube
through there for a relief tube is starting to sound a lot better...