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yakjock(at)msn.com
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 Posted: Sun Jan 21, 2007 5:48 pm Post subject: Breathing Clean Air |
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Hi to all.
I have also been looking for ways to avoid the exhaust pollution in the cockpit. In “8” on longer trips over 5,000’ I wear oxygen whenever I can – it helps a lot but is not a total solution (I have a built in oxygen system on the new CJ to support both pilot and GIB).
On the new CJ “88” we (Shane Wease and I) have installed a NACA under the left wing well outboard of the exhaust trail with scat tubing bringing fresh air to eyeball vents fore and aft. Based on installations I’ve seen in other planes this should provide a very strong flow of absolutely clean air. It should also help to pressurize the cockpit a bit helping to keep the exhaust out. We have sealed every source of leakage we can get to including all the drain holes along the belly. We have also installed a totally new airtight bulkhead separating the cockpit from the hold area. We are planning a second air barrier to go forward of the tail assembly as the large gaps around the tail assembly seem to be a source of exhaust fumes coming back into the plane. In changing to a Sukhoi style exhaust system to fit the closed cowling, I am leaving the exhaust stacks longer than usual until I’ve had a chance to test the plane in flight for exhaust pollution. We will be installing a louvered air exhaust vent near the tail and will, if necessary, install a second small NACA to further ventilate the aft fuselage.
As soon as possible I’ll let you know how successful we are in this clean air fight; the first time I turn on the smoke and pull should give us the answer! (This time I hope that I will not be IMC as I was with Doug the last time!)
I look forward to hearing the progress others are making.
Hal Morley
[quote][b]
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dabear(at)damned.org
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| Posted: Sun Jan 21, 2007 6:36 pm Post subject: Breathing Clean Air |
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How did you make the rear bulkhead (cockpit/hold area) air tight as the
rudder cables run through there?
Yakjock wrote:
| Quote: |
Hi to all.
I have also been looking for ways to avoid the exhaust pollution in
the cockpit. In “8” on longer trips over 5,000’ I wear oxygen whenever
I can – it helps a lot but is not a total solution (I have a built in
oxygen system on the new CJ to support both pilot and GIB).
On the new CJ “88” we (Shane Wease and I) have installed a NACA under
the left wing well outboard of the exhaust trail with scat tubing
bringing fresh air to eyeball vents fore and aft. Based on
installations I’ve seen in other planes this should provide a very
strong flow of absolutely clean air. It should also help to pressurize
the cockpit a bit helping to keep the exhaust out. We have sealed
every source of leakage we can get to including all the drain holes
along the belly. We have also installed a totally new airtight
bulkhead separating the cockpit from the hold area. We are planning a
second air barrier to go forward of the tail assembly as the large
gaps around the tail assembly seem to be a source of exhaust fumes
coming back into the plane. In changing to a Sukhoi style exhaust
system to fit the closed cowling, I am leaving the exhaust stacks
longer than usual until I’ve had a chance to test the plane in flight
for exhaust pollution. We will be installing a louvered air exhaust
vent near the tail and will, if necessary, install a second small NACA
to further ventilate the aft fuselage.
As soon as possible I’ll let you know how successful we are in this
clean air fight; the first time I turn on the smoke and pull should
give us the answer! (This time I hope that I will not be IMC as I was
with Doug the last time!)
I look forward to hearing the progress others are making.
Hal Morley
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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