We use the catch tank option, a small polythene bottle on the pilots side,
on top of the footwell. In 300+ hours I doubt we have seen half a cup full
in total. We have the Airmaster prop so the engine sees high revs on take
off and typically 5000 cruise. Occassionally we might get a slight smell of
oil fumes, but not very often. I doubt the engine has in total burnt and
pushed out 1 pint of oil in that time.
Tony.
Original Message:
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From: Carl Pattinson carl@flyers.freeserve.co.uk
Date: Sat, 1 Nov 2008 13:47:09 +0000
Subject: Europa-List: Oil tank venting
When we originally installed our oil tank (5 years ago) the vent line was
routed to the side of the cowling. The end result is that there is a smell
of oil coming in from the NACA vent when the aircraft is climbing. I
suspect the location of the outlet pipe is also in the airstream resulting
in an excessive loss of oil as it is getting sucked out (and coating the
side of the fuselage).
I was under the impression was that the solution would be to route the vent
pipe via a collector bottle but reading the manual Europa recommend just
routing it to the bottom of the cowling (the bottle being optional).
My concern over the bottle arrangement is how long it takes to fill up the
overflow bottle with oil and how frequently one would need to remove the
cowling (to empty the bottle).
So, based on communal experience which is likely to be the best arrangement
- routing via the bottle or omitting the bottle and ensuring the outlet
isnt placed in the airflow where it could be sucked out.
One thought was to terminate the line at the exit of the exhaust stub
(using copper tube) which would hopefully vaporise and burn off any oil
that escaped. The arrangement would need to ensure no suction took place -
perhaps terminating using a T piece.
Suggestions please ?
Carl Pattinson
G-LABS
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