Original Posted By: Michael Brusilow
Subject: Pietenpol-List: Re: trim>Engine offset is used too counteract engine torque. The nice thing about it>is that the amount of offset thrust you get changes with the power setting.>Engine at idle-(aircraft gliding) = no side thrust generated and none>needed. Engine at or near full power-(cruise or climb) =maximum side thrust>generated when it is needed. So the amount of thrust generated works with>the throttle.>The effect of a given control surface trim is primarily related to aircraft>speed. For example, the amount of rudder trim required to counteractengine>torque in cruise flight would be way too much when the throttle is reduced>(less torque) for descent (about the same airspeed).>Also, think about the take-off. When the power is advanced torque increases>right away but the rudder is not very effective until considerable forward>speed is attained. In the meantime offset thrust is still doing it's job to>help counteract that torque that is pulling you toward the runway lights.>Hope this helps.>it's job to help keep>-----Original Message----->From: Michael Brusilow >To: Pietenpol Discussion >Date: Thursday, November 05, 1998 5:08 PM>Subject: trim>>>>>>>understand>>why adding engine thrust offset is standard practice as opposed to making>>trim adjustments with the control surfaces or trim tabs. I'm looking fora>>general answer and any special considerations applicable to the Piet.>>Thanks.>>>>Mark Boynton>>Phoenix, Arizona>>>>>>>>Simple answer- The Piet does not have adjustable trim tabs.>>>>Mike B ( Piet N 687 MB )>>>>________________________________________________________________________________