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Old Mar 04, 2006, 07:24 PM
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Kings Park, New York
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GP Lancair EP Motor Not Straight??

Hi. I'm a heli guy that just bought a GP Lancair EP for a change of pace. I used to fly small planes, but havent built any yet. I noticed that the motor seems to be mounted crooked, so that if I look at the fuselage from the top, the prop shaft seems to be aiming to the right by about 10-15 degrees. Is that normal for a plane?? Is that done to compensate for the gyroscopic effect? Or did I just get a defective plane?
Thanks!
Ken
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Old Mar 04, 2006, 07:35 PM
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thermlin''s Avatar
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it should have some right thrust in it to compensate for torque. i cant be sure for this plane (i dont have one) but that sounds about right
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Old Mar 04, 2006, 08:21 PM
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I have one!! It is angled for compensation. It's not a problem. hehe.
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Old Mar 04, 2006, 08:25 PM
"I passed on the kool-aid"
Waco, TX
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2-3 degrees is pretty normal....if it really is 10-15 degrees then you have a serious problem.
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Old Mar 06, 2006, 01:06 PM
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Just some info back for you all. I sent a note to Great Planes asking about the off center motor. They said that it's normal, and on the Lancair ES, the motor should be 3-5 degrees right and 1-3 degrees down. I could be wrong about the 10-15 degrees; maybe it IS only 5 degrees right or so. I'm going to try to measure this with some grid paper, a protractor, and ruler. Just thought you all would like to know...
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Old Jun 25, 2008, 06:35 AM
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Lanseria airport South Africa
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Buddy - all Rc tractor (pull) aircraft have to incorporate side and down thrust to counteract tourque. It is a prominent feature of every RC aircraft (prop driven atleast) I have ever seen or flown.
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Old Jun 25, 2008, 01:32 PM
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Um...dig much?
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Old Jun 25, 2008, 09:32 PM
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i guess you have seen a the new parkzone cessnas and stuff yet they have about 30* of down in them
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Old Jun 27, 2008, 11:35 PM
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Lanseria airport South Africa
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haha, I was actually amaized during my initial training on the cessna caravan, the down and side thrust is so prominent it seems the spinner wants to dig a hole down and to the right
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