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Thrust angle

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Old 10-11-2018, 05:38 PM
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lamarkeiko
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Default Thrust angle



Damaged engine box


New engine mount box
I'm rebuilding a damaged nose on a Great Planes Revolver 60. I've built a new engine box that attaches to the first bulk head. I'd like to know if I need to have some engine thrust angle built in, or just ensure my prop shaft is centered to the cowl.

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Lamar
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Old 10-12-2018, 07:06 AM
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All Day Dan
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Lamar, IF no one really knows from experience, start out with zero and trim from there. Dan.
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Old 10-12-2018, 03:42 PM
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speedracerntrixie
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I would put 1.5 degrees right thrust into it and go from there.
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Old 10-12-2018, 04:46 PM
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Thanks for the reply back. I was thinking I might need some right thrust. How do you go about measuring 1.5 degree thrust? Is the first bulkhead used as a reference point?

Lamar
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Old 10-12-2018, 05:16 PM
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r ward
 
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if you can put a straight edge across the bulkhead that the engine mount is bolted to, center the straight edge on the mid point of that bulkhead and measure from the ends of the straight edge back to the tail of the fuselage. same measurement means the bulk head has no offset. shorter measurement is direction bulkhead is offset to for thrust angle. if offset is present,...shorter measurement should be right side looking from the tail of the plane.
with a 12 inch straight edge , 1-1/2 degrees should be a difference in measurement of about 5/16 - 3/8 inch.

Last edited by r ward; 10-12-2018 at 05:20 PM.
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Old 10-12-2018, 05:23 PM
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Offset the engine to the left 1/4" and then center the shaft in the cowl. That will get you really close. It doesn't take much right thrust to help keep the airplane straight during take off runs. The other consideration for right thrust is to keep up lines straight but precision aerobatics is not really in the Revolvers wheel house.
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