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rmfitz(at)hughes.net
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 Posted: Sun Oct 18, 2009 6:46 pm Post subject: CO |
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FWIW; The thread on smoke got my curiosity up so when the chance to fly
came up today I took a pocket CO meter along. On the ground, canopy
closed 14 ppm, flying w/ canopy closed "0". Then to change the airflow
I did some mostly positive acro ( loops & cubans) and it went up to 22
ppm. These are lower than I remember but some time back we put a metal
FOD cover in the tail which would block a lot of the airflow out of the
tail. That probably helped keep the CO out. With the ram air
ventilation of the Yak, closing the open space on the TOP of the
elevator bell crank might do more to obtain positive cabin pressure than
trying to seal cockpit leaks. I am not aware of anyone that has done this.
bob
52BN
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dsavarese0812(at)bellsout
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| Posted: Mon Oct 19, 2009 3:53 am Post subject: CO |
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Many of the Yak 52's do not have flap rod covers inside the cockpit. All 52's originally had the same type covers the Yak 52W and TW have. These openings inside the fuselage are a prime location for air leaks and of course CO as well.
You can help eliminate the cold air billowing into the rear cockpit and some of the CO too by making a soft cover to slide over the horizontal flap rods and affixing the soft cover to the inside of the fuselage. Use a scrap piece of leather or soft vinyl and cut out a "patch" that will fit over the opening on the inside of the fuselage. Cut a slot on one end of the patch so it will slide over the flap rod. Then cut a "star" pattern where the flap rod slides through the patch. Glue the patch to the inside of the fuselage with contact cement.
It's not perfect, but it sure does reduce the cold air tremendously and I'm sure it also helps to reduce the CO in the cockpit.
Dennis
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