Taking off in a straight line!!

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8 years 1 month ago - 8 years 1 month ago #8402 by kevinross
Replied by kevinross on topic Taking off in a straight line!!

ronp849 wrote: Can anyone answer this question?

When a model is taking off under max or near max power, it veers to the left. This is invariably explained as a result of torque reaction from the prop and is countered with right rudder.
The question is how does a torque about the roll axis, (prop reaction) get translated to a torque about the yaw axis, (veer to the left) when both wheels are firmly on the ground preventing any roll movement?


Torque reaction does affect the direction during take-off BUT by far the major cause is the anticlockwise (looking from the front) rotating slipstream from the prop. which strikes the vertical stabiliser / Rudder which on 99% of aircraft is above the centreline. Then there is nothing below the centre line to counteract the effect (an exception being the Dornier 335)
Last edit: 8 years 1 month ago by kevinross.

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