Simviation Forum - Rudder on Take Off

Jun 3^rd, 2004 at 3:08am

MadDriver Offline
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In small planes, like the Cessnas, during full power on take off, the planes always get pulled drastically to the left. My joystick is calibrated, there is no wind, perfect weather.... any ideas? Also, on bigger planes, like the 737, it goes left slightly.

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Reply #1 - Jun 3^rd, 2004 at 3:30am

Eskimo Offline
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Don't worry, this is called the slipstream effect. Air disdurbed by the propellor gets pulled through it goes underneath the body of the aircraft and hits the tailplane on the left hand side thus creating yaw to the left. It is something we pilots must counter all the time in real life using rudder but you could try reducing the realism settings slightly to counteract the effect.

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Reply #2 - Jun 3^rd, 2004 at 5:19am

ozzy72 Offline
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In your realism settings just reduce the torque setting Wink

Alas in real life this is what happens.

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Reply #3 - Jun 3^rd, 2004 at 10:55am

chops Offline
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this is the exact reason why most twins spin their props in opposite (counter-rotating) directions. Before aircraft builders figured this out and both props on twins rotated the same way, you got MAJOR pull to the left. Just try the default Comet!

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Reply #4 - Jun 3^rd, 2004 at 6:31pm

afi0yz Offline
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Nor Cal

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This is just the pull from your prop turning in that direction, it happens in real life too but is corrected by giveing a little rudder in the oppisite direction, if you don't like it you can just turn p-factor all the way down in options.

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Reply #5 - Jun 3^rd, 2004 at 6:48pm

Hagar Offline
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Quote:

this is the exact reason why most twins spin their props in opposite (counter-rotating) directions. Before aircraft builders figured this out and both props on twins rotated the same way, you got MAJOR pull to the left. Just try the default Comet!

Hi Chops. Twins & multi engined aircraft with opposite rotating props are not all that common even today. The principle itself has been known almost as long as the first powered aircraft. They're not fitted mainly for convenience & ease of maintenance more than anything else. If the engines & props are interchangeable it's a lot less bother & also cheaper.

Most modern aircraft have adjustable rudder trim tabs which can be set to offset the torque effects. You can do this in the sim too. On older aircraft the rudder trim was often fixed or adjustable only on the ground.

PS. If the flight model is accurate the default Comet should pull to the right. The props on many vintage types rotate in the opposite direction to those on most modern aircraft.

« Last Edit: Jun 4^th, 2004 at 4:56am by Hagar »

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Reply #6 - Jun 3^rd, 2004 at 7:40pm

SnowmanSimon Offline
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I need help I get the same thing. and the p-factor and torque are all the way down...settings are all on easy and i turned off aircraft turbulance and it all went away but now my plane drifts to the right...I got this on FS2000 as well. Could it be a preset ruder thing and now that everything is there is nothing fighting it and the plane goes to the right.

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Reply #7 - Jun 3^rd, 2004 at 8:08pm

SnowmanSimon Offline
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I narrowed it down to weather and clear skies....but why do i always drift to the right and the same speed, angle....

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Reply #8 - Jun 4^th, 2004 at 4:45am

Hagar Offline
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Simon. Try recalibrating the joystick or whatever controller you use. If there's no crosswind I suspect this is the most likely cause of your problem. It will depend on the type of aircraft. Jets should not be affected by prop torque or P-factor. Most of the default FS9 props would veer to the left, not right. On multi-engined types make sure that all engines are running before attempting to take off.

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Reply #9 - Jun 4^th, 2004 at 8:11pm

nickle Offline
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US engines spin clockwise (cockpit view).
All require TO check list trim settings. Not given in sim that I know of. Cessna mild so feed a little left rudder on TO roll.
BR engines counter clockwise. Rt rudder trim settings esp Comet since both turn CC. Must have a locked tailwheel.
My Comet settings: p_factor_on_yaw =0.5 //was 1.0

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