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cffd(at)pgrb.com
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 Posted: Sun Jun 28, 2009 8:07 am Post subject: Apparent Heavy Wing |
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Proper installation of the engine side thrust (about 3 degrees right for Jabiru, 912’s, Lycomings) will counteract Pfactor and torque. The offset is tailored for normal cruise. That is why in a Cessna 150 you hold right rudder during takeoff and climb at WOT.
The down elevator cable on my Zenith 701 is pulled to the right by a spring to keep it from rubbing the up elevator cable. This puts a torque on the stick to the left and thus the heavy left wing. I have a trim tab on the right flaperon to take out some, but not all of the heavy left wing. I have a jackscrew arrangement that pulls on a spring attached to the right flaperon rod for roll trim. When parked the stick always leans to the left. I can trim with any configuration of wing tank quantities.
Pfactor and torque are not the cause for making apparent heavy wings on Zenith aircraft.
Chuck D.
N701TX
[quote][b]
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Sun Jun 28, 2009 4:56 pm Post subject: Re: Apparent Heavy Wing |
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Don't forget asymmetrical thrust due to the difference in lift generated between the ascending and descending blades (different angles of attack.)
In level flight and reduced rpms such an effect is reduced.
Tim
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