Torque

[TonyJoey]

Is the torque of an aircraft the same way the prop spins, or opposite which I have always thought it was, based on Newton's Third Law?

[Lusche]

Opposite

[texastc316]

isnt there a couple of planes that torque the opposite way of the rest ie: tempest? Or am I comfused again?

[Stoney]

isnt there a couple of planes that torque the opposite way of the rest ie: tempest? Or am I comfused again?

Technically speaking, that is not torque--its a characteristic called P-Factor.  But yes, you're correct--Tempest, Spit XIV, etc.

[texastc316]

thank you sir 

[BMathis]

P-factor, also known as asymmetric blade effect and asymmetric disc effect, is an aerodynamic phenomenon experienced by a moving propeller with a high angle of attack that produces an asymmetrical center of thrust.

 

[texastc316]

P-factor, also known as asymmetric blade effect and asymmetric disc effect, is an aerodynamic phenomenon experienced by a moving propeller with a high angle of attack that produces an asymmetrical center of thrust.

 

you lost me at hello 

[BMathis]

 

.........The p-factor is caused by the resultant velocity, which is generated by the combination of the velocity of the propeller blade in its plane of rotation and the velocity of the air passing horizontally through the propeller "disc". with the airplane being flown at positive angles of attack, the right (viewed from the rear) or downswinging blade, is passing through an area of resultant velocity which is greater than that affecting the left or upswiging blade. since the propeller blade is an airfoil, increased velocity means increase lift. Therefore the downswinging blade having more "lift" tends to pull (yaw) the airplane's nose to the left.  Or right with the Yak, Spit14, and Typhs...

Torque Is really described like this:

Torque is the tendency of a force to rotate an object about an axis (or fulcrum or pivot). Just as a force is a push or a pull, a torque can be thought of as a twist.
         Torque is also called moment or moment of force. This should neither be confused with the various other definitions of "moment" in physics nor with "momentum". In the context of mechanical engineering, the terms "moment" and "torque" are not necessarily interchangeable; rather, one or the other may be preferred in a specific context. For example, "torque" is usually used to describe a rotational force down a shaft, for example a turning screw-driver, whereas "moment" is more often used to describe a bending force on a beam.

The magnitude of torque depends on three quantities: First, the force applied; second, the length of the lever arm connecting the axis to the point of force application; and third, the angle between the two.


Ahhhh the wonders of Google 

[texastc316]

.........The p-factor is caused by the resultant velocity, which is generated by the combination of the velocity of the propeller blade in its plane of rotation and the velocity of the air passing horizontally through the propeller "disc". with the airplane being flown at positive angles of attack, the right (viewed from the rear) or downswinging blade, is passing through an area of resultant velocity which is greater than that affecting the left or upswiging blade. since the propeller blade is an airfoil, increased velocity means increase lift. Therefore the downswinging blade having more "lift" tends to pull (yaw) the airplane's nose to the left.  Or right with the Yak, Spit14, and Typhs...

Torque Is really described like this:

Torque is the tendency of a force to rotate an object about an axis (or fulcrum or pivot). Just as a force is a push or a pull, a torque can be thought of as a twist.
         Torque is also called moment or moment of force. This should neither be confused with the various other definitions of "moment" in physics nor with "momentum". In the context of mechanical engineering, the terms "moment" and "torque" are not necessarily interchangeable; rather, one or the other may be preferred in a specific context. For example, "torque" is usually used to describe a rotational force down a shaft, for example a turning screw-driver, whereas "moment" is more often used to describe a bending force on a beam.

The magnitude of torque depends on three quantities: First, the force applied; second, the length of the lever arm connecting the axis to the point of force application; and third, the angle between the two.


Ahhhh the wonders of Google 

God darnit, Mr. Lamarr, you use your tongue prettier than a twenty dollar hooker


ahh the wonders of Blazing Saddles

[Cthulhu]

.........The p-factor is caused by the resultant velocity, which is generated by the combination of the velocity of the propeller blade in its plane of rotation and the velocity of the air passing horizontally through the propeller "disc". with the airplane being flown at positive angles of attack, the right (viewed from the rear) or downswinging blade, is passing through an area of resultant velocity which is greater than that affecting the left or upswiging blade. since the propeller blade is an airfoil, increased velocity means increase lift. Therefore the downswinging blade having more "lift" tends to pull (yaw) the airplane's nose to the left.  Or right with the Yak, Spit14, and Typhs...

Torque Is really described like this:

Torque is the tendency of a force to rotate an object about an axis (or fulcrum or pivot). Just as a force is a push or a pull, a torque can be thought of as a twist.
         Torque is also called moment or moment of force. This should neither be confused with the various other definitions of "moment" in physics nor with "momentum". In the context of mechanical engineering, the terms "moment" and "torque" are not necessarily interchangeable; rather, one or the other may be preferred in a specific context. For example, "torque" is usually used to describe a rotational force down a shaft, for example a turning screw-driver, whereas "moment" is more often used to describe a bending force on a beam.

The magnitude of torque depends on three quantities: First, the force applied; second, the length of the lever arm connecting the axis to the point of force application; and third, the angle between the two.


Ahhhh the wonders of Google 

Yep  . And yes, what you're feeling at low speed and high throttle is torque. The magnitude which the ailerons need to overcome is a function of the relative rotational inertials of the prop and the rest of the airplane about the thrust axis.

Yaw due to P-factor is secondary, but it can complicate matters, especially if you're slow, pulling high alpha, and decide to really mash the gas pedal. Then the P-factor wants to yaw the aircraft into the wing that's already dropping due to torque, and you could find yourself slow and wings vertical (or inverted), something that really sucks if you're at 50 ft on approach.

[StokesAk]

you lost me at hello 

1+1=2   

[Ack-Ack]

1+1=2   

26+26= 42


ack-ack

[Frodo]

26+26= 42


ack-ack

         Gunman26

And I thought this was a thread on a long ago F4u dweeb!    

Frodo

[TonyJoey]

26+26= 42


ack-ack

  That was hilarious

BTW, thx snail

PS: Go Gutless Gastropods!

[Tilt]

i liked HT's definition better..............

1. Torque. a rolling force.
2. Slip stream, produces both roll force oposit torque  and yaw force.
3. P Factor produces both pitch and yaw forces.
4. Gyroscopic both pitch and yaw forces.

Torque by itself does not produce a yaw tendency, only a roll, as straiga describs it does produce a secondary yaw force do to increase load on 1 tire but this is very minor force.

The major force involved when starting a take off roll is only slip stream.

P factor and gyro, do not have any effect at the start of a take off roll.

Torque is computed simply

(Current HP) / RPM * 5252

Also torque is produce fairly linar to the throttle setting and is effected very little by the engine speeding up or slowing down.

HiTech