Hi! All.
Just back from the Oshkosh Experience. What a lesson in logistics and event
management. The site needs to be visited to be appreciated. Exceptionally
clean and tidy with all staff and Waste Management quietly busy behind the
scenes handling the needs of thousands of visitors to not only a
Homebuilders
Event but a Warbirds, Float Birds, Micro-Light and Military Air show
combined. I hope someone who subscribes to this forum from a more local view
point will pass on my appreciation to those concerned. Good to meet up with
many of the other world wide builders. Hope you all arrived home
safely,guys.
Sorry about the off topic ramble.....
with respect to flap drive slot closing may I point to the
flap/extensions/drive rigging guide tube and close out on G-PTAG. It works
well except with the question of fume ingress from the underwing loaded
aspect suggested below needing investigation although with my own Control
stick Boots fitted using carbon monoxide "tell tales" I don't seem to have
any such problems.
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: forum-owner@europaclub.org.uk
Subject: Re: Static pressure at fuselage openings
Sounds like the sealing of the flap slots against fumes ought to be a
mandatory mod.
Did you experience any real speed increase?
Duncan McF.
>
> The pressure in the aft fuselage area of N135TD (a monowheel XS) is
> considerably higher than the pressure in the cockpit. We had quite a
> cold breeze on the backs of our legs in the winter, due to air coming in
> through the aileron torque tubes. This was accompanied by an elevated
> level of carbon monoxide, which was higher in the vicinity of the
> control stick pivots. Theorizing that the high pressure under the wing
> would force air in through the flap drive slots, we fastened a strip of
> baffle seal (the sort shipped with our engine kit) to the bottom surface
> of the inboard end of each flap. This seals the gap between the flap
> and the fuselage, preventing ingress of exhaust gas (particularly on the
> port side), which eliminated all detectable carbon monoxide.
>
> Although the exhaust no longer gets in, we still have air flowing from
> the aft fuselage into the cockpit. The excellent leather stick boots
> from Mr. Leatherman have eliminated the breeze on our legs, but we get a
> steady flow of air out through the slot for the landing gear lever, even
> with the fresh air vents closed. The flap hinge slots on the belly are
> sealed with the fairings from the factory speed kit, which leaves the
> small openings in the bulkhead at the rear of the wheel well, the flap
> drive slots above the wings, and the trim tab slots at the tail. We
> don't know what is happening at any of these locations.
>
> Dave DeFord
> N135TD
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