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Cherokee Carb Heat.
Is this just a technique or proper procedure?
All the Piper POH's I've seen say only use carb heat if you suspect carb icing. |
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Plus: Hey Jay is this a family event at Oshkosh you're planning? I've got
my non-flying family driving with me up to OSH and would like to meet some other local and non-local friendly folks! As a matter of procedure we don't use carb heat in the pattern at all in Pipers. In fact, in nine years of flying 140s thru 235s, I've only used carb heat "for real" once. (Of course, I don't fly IFR...) As for the Oshkosh get together being a "family event", well, my two children (ages 9 and 12) will be there, so I guess we'd better keep our clothes on for the most part! If you're gonna stop by, it would be good to sign the roster (see the post "Oshkosh Get Together Roster -- Sign in, please!") so we all have some idea of who's who... (By the way, did you see the invite at Green Castle?) -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
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Actually, I got in a situation in a cherokee (a 1980 Dakota) where the engine
was icing up and quitting just on the taxiway. By the time I got to the runup, the engine just died. Happened a few times, had the thing looked at, the conclusion was carb ice. On the ground, no less. Jose (for Email, make the obvious changes in my address) |
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Teacherjh wrote: Actually, I got in a situation in a cherokee (a 1980 Dakota) where the engine was icing up and quitting just on the taxiway. By the time I got to the runup, the engine just died. Happened a few times, had the thing looked at, the conclusion was carb ice. On the ground, no less. The main reason you don't need to habitually use carb heat with a Lycoming is the fact that they run the induction tubes through the oil sump. When the engine is warm, the hot oil tends to keep the carb warm. The situation you describe (cold engine, near-closed throttle plate) would be perfect for formation of carb ice if the humidity were high. George Patterson The optimist feels that we live in the best of all possible worlds. The pessimist is afraid that he's correct. James Branch Cavel |
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I just scanned my Warrior II POH for this. It says to use carb heat if you
suspect icing (anywhere, but particularly in descents with low throttle settings), and advises on how to check for the presence if icing. There's also an optional carb ice detection system available for my model. Unlike the Grumman AA1-C I fly, however, the descent checklist in the Piper says "CARB HEAT ON (if needed)" instead of an unqualified "CARB HEAT ON". I seem to remember hearing something about the location of the carburator intake under the hood in the Cherokee -- it gets pre-warmed air or something like that, and that's why it's not as likely to happen. There's a decent article out there about this, if you're interested: http://www.avweb.com/news/columns/182189-1.html. Happy Landings! "Hobbes1157" wrote in message ... Hi there. I've got a question about the carb heat in a Cherokee. I was told that you only need to apply it for a short while (5 seconds) while on downwind to make sure the carb is clear of ice. She (CFI) said that Pipers don't need it all the time as Cessnas do. Is this just a technique or proper procedure? Comments appreciated. Plus: Hey Jay is this a family event at Oshkosh you're planning? I've got my non-flying family driving with me up to OSH and would like to meet some other local and non-local friendly folks! Thanks, Nolan PPSEL, INST, commerial student IA24 (green castle) |
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David Megginson wrote in message ...
(Rocky) writes: A little trick that I learned back in the early 50's, and pass on to all who don't know of it, is using the PRIMER to keep the engine running if it shuts down for carb ice. The primer injects fuel directly into the intake manifold bypassing the carburetor and can keep the engine running intermittently and in many cases generate enough heat for the carb heat to become effective again. I've used this technique a few times in aircraft to get home. In Pipers (PA25 Pawnee while crop dusting) and Cessnas (C-172 and 177). Ol Shy & Bashful That's a brilliant suggestion -- I'm assuming that you leave carb heat on, so that there's still an air supply into the cylinders. All the best, David Carb heat is left on in the event that the generated engine heat becomes effective again to change the intake air temp. |
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