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Sperry autopilot, how does it work?

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Tobus View Drop Down
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    Posted: 21 Oct 2011 at 10:54am
I have a question regarding the Sperry autopilot.

I can set it correctly: just fly straight and level on specified course, set the sperry to correct course, so both "match". Set throttle, props, mixture and elevator trim to get level flight, then set Sperry to "on".

The a/c flies on desired course, but altitude always slowly increases. I can not get it to fly level using the elevator knob on the sperry.

What am I doing wrong?

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papeg View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote papeg Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2011 at 2:23pm
Try reducing your throttle a little.
Greg
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johnep View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnep Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2011 at 8:29am
Natural tendency to gain height as fuel burns off reducing weight.
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Tobus View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tobus Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2011 at 9:08pm
Reducing throttles does not make sense, since I'm at normal cruise settings. In any case, it does not help for long.

I know of the natural tendency as fuel burns of, but it doesn't happen over time, but rather quickly after setting the sperry to on.

any other pointers?
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