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Throttle Elevator Mixing

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Old 07-31-2004, 08:53 AM
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rightflyer
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Default Throttle Elevator Mixing

I was wondering if anyone has tried a throttle/elevator mix to adjust level flight? If so, where did you start?
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Old 07-31-2004, 12:32 PM
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Rodney
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Default RE: Throttle Elevator Mixing

If you are having trouble with climb/dive with throttle changes, you most probably have an improper thrust line set up. If the plane climbs drastically with increased throttle, add some down thrust until, when trimmed out for level flight at half throttle, it neither climbs or dives when you increase throttle, just speeds up.
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Old 07-31-2004, 04:22 PM
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N1903Z
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Default RE: Throttle Elevator Mixing

Hi rightflyer! I tried it on a Hobbico Superstar 40 RTF which has a flat bottomed wing airfoil. The high climb rate of the Superstar 40 at higher throttle settings is caused by the increased lift due to the resulting increased airspeed over the flat bottomed wing. I programed in 5% down elevator at full throttle. Elevator throw was 3/4" full up and 3/4" full down from the neutral position. It wasn't that good a solution but it did help. To get it to not climb at all at full throttle, I would have had to program much more down elevator. The problem with that was that at take-off, you have to constantly hold in some up elevator until after climb-out. If you released the elevator stick during climb-out, a nasty diving tendency would occur until a good cruise speed was reached. A better solution is what Rodney said. I didn't do the thrust line thing cause I was too lazy. I do wonder though why the designer didn't put in the proper downthrust in the first place.
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