PPRuNe Forums - View Single Post - A question about propeller torque during takeoffs
Old 23rd Jul 2015, 17:16
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Shaggy Sheep Driver
 
Join Date: Oct 1999
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You should NEVER use brake on take off, unless you've 'lost it' and are aborting the take off. You simply refrain from usuing full power until the rudder has sufficient authority to keep the aeroplane straight. Crosswinds will have an effect here, as well.

In the Chippy (145hp tailwheel), left foot goes forward with left hand at the start of the t/o roll. As speed increases less left rudder is needed.

In the Yak 52 (360hp nosewheel) you use full left rudder but you don't use full power until the rudder has enough authority to keep the aeroplane straight (doesn't take long in that hot ship! T/O gives a real shove in the back!).

The Yak has some unusual steering characteristics on muddy winter airfields. It has narrow mainwheel tyres so differential braking (the usual method of steering on the ground) is usually ineffective as the wheels simply lock and slide rather than restraining one side of the aeroplane. You can use course power changes to steer, however, as the torque from the engine will 'dig in' the right wheel on power application, and the left wheel on sudden power reduction.

This picture shows a little bit of left rudder still held on after take off as the aeroplane is at full power, in level flight, and accelerating:

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