US 41CC losing power
04-28-2003, 07:45 PM
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US 41CC losing power
Have a US-41cc gasser that has a decrease in power after the engine warmes up at full throttle. Is it because there is not enough airflow to the engine inside the cowl causing it to get too hot or is it too lean or rich on the high end? Thanks in advance for any help you can provide.
04-28-2003, 10:01 PM
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US 41CC losing power
Can overheat if cowled in without enough outlet area. outlet erea should be at least 3 times the inlet area. If you can, fly it without the cowl to find out. lean mix or a combination can do it also.
04-28-2003, 11:31 PM
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US 41CC losing power
Yup, and exhaust air area if its still facing into the wind (a la Ultimate, etc) isn't doing much good. It has to be sucking the air out of the cowl. Tex.
04-29-2003, 03:00 AM
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US41
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From my own experience with the US41, aside from the possibility of not enough air exit space, you may be too lean. If the exit opening is sufficient, try opening your hi needle an 1/8 of a turn. If it improves, try another 1/8 turn. Mine acted like that until I richened it up and ran a couple of gallons through it. Once set up, these are good running and user friendly.
Phil
From my own experience with the US41, aside from the possibility of not enough air exit space, you may be too lean. If the exit opening is sufficient, try opening your hi needle an 1/8 of a turn. If it improves, try another 1/8 turn. Mine acted like that until I richened it up and ran a couple of gallons through it. Once set up, these are good running and user friendly.
Phil
