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Old 12-17-2007 | 07:35 PM
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From: Elizabethtown, PA
Default RE: Is Right Thrust Really Needed For 3D


ORIGINAL: Ernie Misner

No problem Bill. I hadn't thought that through in some time, just had been taking it for granted for a while I guess, so really hoped I wasn't getting too far off.

What's amazing is that lots of folks don't understand the underlying reasons for right thrust. Many think it is to counteract the torque of the engine, but that would be roll-wise, not yaw-wise.

Another reason for right thrust that I have seen explained is that as the propwash curls towards the tailfeathers, it usually induces some left yaw from pressures on the rudder I guess.

Thanks for not ejecting me from the forum....:-)

Ernie
Sorry guys, my connection went down AGAIN right after I created my last response. Actually I was surprised to see it as I thought it did not make it through

Anyway, right thrust actually does two things, it does counter act some of the P-factor (propwash) by actually moving it forward on the vertical fin and it does help eliminate roll but it also does help eliminate some yaw as well.

I always tell people that want to learn basic aerodynamics and how a plane actually flies is to by a copy of Stick and Rudder from Amazon by Wolfgang Langewiesche. It's a very old book and is for full scale aircraft but it also applies to us as well. It's been around so long that the elevators are called "flippers" in it which back when my dad flew that is what they called them.

Ernie, you are essentially correct though, I invite everyone to talk to a full scale Mustang pilot that actually flies one with one of the huge 4 blade props and ask him what he has to do in level flight if he plants the throttle to the firewall, he'll tell you he has to stomp on the rudder to counteract P-factor and add left aileron to counteract the roll and has to slowly let them out once his speed builds.

I still stand by my original statement of properly trimming a plane certainly takes a lot of load off of you. I think Jake can relate to that. When he started in IMAC, myself and another went to fly with him and we flew his plane. We suggested trim changes and he mentioned he felt and saw diufference in the way the plane handled in all modes, I seem to remember he mentioned he still had to do certain things but a lot less of it and it was way more predictable.

Oh Ernie

Thanks for not ejecting me from the forum....:-)
I'm not that mean YET...

If we lose power once more I may become mean