RE: [Acro] Re: FUMES IN COCKPIT
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Like Alex said, the fuel sloshes around and some of it comes out the fuel vent and may or may not get into your cockpit. This happens as you go through the knife edge in the T. If you watch somebody with a full fuel tank doing acro down low, you can often see the small spray of vapor coming off the fuel overflow or the little oil puffs coming out the overflow tube.
On Caps and some other aircraft the fuel overflow was moved down onto the gear leg, presumably to reduce the periodic smell of gas, but that led to an aircraft burning down when its venting gas ignited on the hot brakes and also I believe mud/grass/bugs plugging the overflow.
Obviously though the smell should not be anything more than a wiff, if the smell is persistent then there is something wrong and it should be checked carefully. Obvious things that can cause problems are old fuel lines which have a tendency to crack underneath the metal sheathing and cracked fuel tanks. Fuel lines are especially prone to problems if they were recently removed and reinstalled in a slightly different configuration. There is lots of good stuff on fuel system problems in the IAC technical tips books which you can get from the IAC.
From: Alex Belov [SMTP:firstname.lastname@example.org]
Sent: Thursday, April 04, 2002 10:34 PM
To: charles chadwick
Cc: iac list
Subject: [Acro] Re: FUMES IN COCKPIT
Happens in my T often in right knife-edge as little bit spills
overboard...after a while started looking forward to it and beginning to
like it. that stuff aint addictive, is it? :-)
Alex Belov, President
International Aerobatic Club Chapter 52
On Thu, 4 Apr 2002, charles chadwick wrote:
> I have been flying a friends S2B for a few weeks and notice gas fumes
> in the cockpit. They only seem to occur during acro. The plane has
> apparently had this problem for over four years. There is no visible
> evidence of a fuel leak. Any ideas on where to look and possible
> solutions. Thanks.
> Ron Chadwick