Not too long ago there was some discussion of icing and a question about the removal of air filters to prevent the engine from quitting. There was a comment made stating that it would take a lot of snow to plug the induction, and I believe the statement was made regarding a Cessna 180.
I'm bringing this up again because I think the statement might be misleading and I think the topic is worthy of more discussion apart from the thread where it originated.
I have previously reported an experience I had with a 150hp narrow deck on a PA-12 with a Bracket air filter.
"Last winter I made a flight and I was pushing darkness so I climbed high and went direct over some pretty inhospitable country to try and arrive before dark. It started running rough and I suspected carb ice. Carb heat helped some but the problem persisted and I tried to divert to country that was a little more survivable to a forced landing. After a few more bouts of ragged running and carb heat, I pushed in carb heat to see if things were good and the engine quit. Carb heat or alternate air got the engine back and I diverted to the nearest strip and made a precautionary landing. I drained all the sumps without a drop of water, and couldn't find anything wrong. The run up was normal so I took off and circled until I was more or less sure it was going to keep running and continued my flight through the friendliest terrain I could find, landing after dark at my destination.
I suspected that the bracket air filter had iced up, and before I made the return trip I washed all of the oil out of the filter with gas and dried the filter above a wood stove. The return trip was made through the friendliest country I could find without incident. I replaced the filter, but never did find anything wrong with it. "
I will include several more comments. At the time of my flight there was not a visible cloud in the sky, and there was no snow. The airplane did not appear to be making ice. Temperatures were below freezing at all altitudes Carb heat was not fixing my problem, It was saving my bacon by giving me alternate air. I was approx. 10 miles from the "Lost Coast"
I told a friend of mine about the experience. He said that some of the guys used to pull out the air filters to keep ice crystals from clogging filters during winter. He also said that the practice increases fuel burn.
I'm bringing this up again because I think the statement might be misleading and I think the topic is worthy of more discussion apart from the thread where it originated.
I have previously reported an experience I had with a 150hp narrow deck on a PA-12 with a Bracket air filter.
"Last winter I made a flight and I was pushing darkness so I climbed high and went direct over some pretty inhospitable country to try and arrive before dark. It started running rough and I suspected carb ice. Carb heat helped some but the problem persisted and I tried to divert to country that was a little more survivable to a forced landing. After a few more bouts of ragged running and carb heat, I pushed in carb heat to see if things were good and the engine quit. Carb heat or alternate air got the engine back and I diverted to the nearest strip and made a precautionary landing. I drained all the sumps without a drop of water, and couldn't find anything wrong. The run up was normal so I took off and circled until I was more or less sure it was going to keep running and continued my flight through the friendliest terrain I could find, landing after dark at my destination.
I suspected that the bracket air filter had iced up, and before I made the return trip I washed all of the oil out of the filter with gas and dried the filter above a wood stove. The return trip was made through the friendliest country I could find without incident. I replaced the filter, but never did find anything wrong with it. "
I will include several more comments. At the time of my flight there was not a visible cloud in the sky, and there was no snow. The airplane did not appear to be making ice. Temperatures were below freezing at all altitudes Carb heat was not fixing my problem, It was saving my bacon by giving me alternate air. I was approx. 10 miles from the "Lost Coast"
I told a friend of mine about the experience. He said that some of the guys used to pull out the air filters to keep ice crystals from clogging filters during winter. He also said that the practice increases fuel burn.
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