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#21
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Andrew Gideon wrote in message gonline.com...
I thought I'd let you all know what's going on. First, a mechanic with whom we checked claimed to be familiar with the Cardinal's scoops, and said that the R182 had no such thing. Given that the tail structure of the Cardinal is so different from other Cessnas, apparently, this isn't too surprising. But I have to admin: I'm still not completely certain. However, we've had the extensions installed (although I've yet to see them; the airplane pulled out as I arrived at the airport yesterday). The airplane has flown 6.9 tachometer hours since then, and has been showing a steady zero reading on the CO detector. So...it looks good at the moment. - Andrew Sounds great! It's always nice to finally solve a problem. How much did you extend the pipes? I am also interested in how the FAA will view this. OK or not, as it is a mod to major component. 337 maybe? Congrats! Regards, Bruce |
#22
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Andrew Gideon wrote in message gonline.com...
Our Cessna R182 is getting CO in the cockpit. We've now had three different shops look at it multiple times, all to no (complete) effect. They've done things like resealing the firewall, the gear-wells, the exhaust, and the like. But still we get CO. We've swapped CO detectors around between planes, so the detectors' results are trusted. One interesting oddity: turning cabin heat on does seem to get rid of the CO. That's common. Its a well talked about myth that turning off the heater gets rid of CO. The CO comes around the slip stream and slips into the cockpit. Also, there really is no way to "turn off" the heat the doors just aren't that good. I carry a digital CO detector in my plane. After my last exhaust leak I got 1500ppm with the heat on and 800ppm with the heat off. Still more than enough to make you sad. What works well is to open lots of windows and blow a lot of air around. Diluting the air with fresher air keeps the ppm down. -Robert |
#23
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Robert M. Gary wrote:
: 800ppm with the heat off. Still more than enough to make you sad. What : works well is to open lots of windows and blow a lot of air around. : Diluting the air with fresher air keeps the ppm down. Sucks for a Cherokee driver that has only one 6x4" window. Lean 'er 'till she wheezes to keep the CO (and fuel burn, engine deposits, detonation potential, etc) down I guess. There's no acute effects of NOx are there? -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#24
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#25
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Since noticing this discussion I started looking more closely at the
location of the exhaust stacks on my Archer. They are forward and towards the pilot's side of the engine air intake. That makes sense since it allows the prop wash to swirl the exhaust gasses away from it. More interestingly the exhaust might swirl up past the pilot's vent window, possibly allowing CO etc to enter the cockpit if that window is not sealed well. This makes me wonder if some exhaust gasses might enter the Archer's cockpit during taxi, especially if a scoop is installed in the vent widow. -- Regards, Mike http://mywebpage.netscape.com/amountainaero/fspic1.html wrote in message ... Robert M. Gary wrote: : 800ppm with the heat off. Still more than enough to make you sad. What : works well is to open lots of windows and blow a lot of air around. : Diluting the air with fresher air keeps the ppm down. Sucks for a Cherokee driver that has only one 6x4" window. Lean 'er 'till she wheezes to keep the CO (and fuel burn, engine deposits, detonation potential, etc) down I guess. There's no acute effects of NOx are there? -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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