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Old May 10, 2015, 02:38 PM
mior is offline
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In this picture I see that the rear rotor is not aligned with the rudder. Is it right?
If yes, why?
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Old May 10, 2015, 10:36 PM
Ran D. St. Clair is offline
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Quote:
Originally Posted by mior View Post
In this picture I see that the rear rotor is not aligned with the rudder. Is it right?
If yes, why?
Yes, it is intentional. The 4 wing motors are 2 CW and 2 CCW so in theory they cancel each other out in terms of torque. There is nothing to cancel the torque of the tail rotor however. It turns CCW when viewed from above, so the plane would naturally yaw to the right. by leaning the tail rotor to the right it drags the tail to the right, and nose to the left so it all cancels out. The plane then needs to lean slightly left to counter the right thrust from the tail, but it is such a tiny amount you can't even see it.
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Old May 11, 2015, 04:18 AM
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Quote:
Originally Posted by Ran D. St. Clair View Post
Yes, it is intentional. The 4 wing motors are 2 CW and 2 CCW so in theory they cancel each other out in terms of torque. There is nothing to cancel the torque of the tail rotor however. It turns CCW when viewed from above, so the plane would naturally yaw to the right. by leaning the tail rotor to the right it drags the tail to the right, and nose to the left so it all cancels out. The plane then needs to lean slightly left to counter the right thrust from the tail, but it is such a tiny amount you can't even see it.
And what is the angle of rotor, please?
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Old May 11, 2015, 08:35 AM
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And what is the angle of rotor, please?
You can measure it from the picture, or do what I did and see which way the plane wants to turn and adjust it from there. It is not critical. Yaw control is weak on the XC-142, since it is controlled by the ailerons. If there is any headwind, or the plane has any forward speed it will weathervane into the wind anyway. If flown indoors in a small room it will yaw somewhat randomly due to the air recirculation within the room. If you want to see the trim point you need to be outdoors on a calm day and at least 4 ft. off the ground.
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