Exhaust smells in the cockpitFergus, you are so right. The high
pressure air from under the wing is forced into the rear fuselage
through the slot of the flap-tube. This makes it impossible to drain any
air from the cock-pit area out through the tail-section. I had 5 holes
of 1" diameter drilled through the D-section, before covering it with
fabric, which only got exhaust fumes to the cock-pit from the rear!.I am
now in the process of sealing the lower flap-to-fuselage junction
completely with small, shaped tabs of flexible fiber-glass and tape to
be pressed against the fuselage along the under side of the flaps. This
should also stop the outward bulging of the doors at higher speeds.
Fairings attached to the main-wheel swinging arm as well as to the
fuselage behind the wheel are nearly finished and should provide a much
better seal to the wheel-well, which has to be a main source of drag as
well. I should be able to report the results shortly.
Regards
Peter Timm, # 110
----- Original Message -----
From: Fergus Kyle
To: EUROPALIST
Sent: Sunday, April 13, 2008 10:52 AM
Subject: Europa-List: Exhaust smells in the cockpit
Cheers,
There was a flurry of discussion when the fillets took
interest, which mentioned ingestion of exhaust through the flap slots
due to various configurations of flap (and earlier talk of CO through
the wheel slot, etc.) - and it may be so. The reason could be that the
cockpit area is of too low a pressure to prevent ingestion.
Remembering the DC9's system, it was then clear to me that a
pressurized cabin prevented such antics - and so have tried to arrange
that the cockpit be 'over-fed' with outside air and both temp and flow
be controlled by the exit. It then would seem wise to organise larger
than normal hot AND cold influx, adjust the ratio of each for comfort
and control the total flow by outlet valve. Whether I achieve this is
another thing.
Happy landings
Ferg
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Checked by AVG.
4/10/2008 5:36 PM
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