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# static thrust of tail rotor in pounds????

## static thrust of tail rotor in pounds????

(OP)
This is a very general question intended to gain a perspective. I am thinking of making a variable pitch prop. with blades tilting on spherical bearings to change pitch  . The tail rotos I have looked at have no helical twist which makes me wonder about their thrust output . If a rotor is about 6 feet in diameter turning approx. 2500 rpm what would be the thrust output at a given pitch angle . Thanks ED

### RE: static thrust of tail rotor in pounds????

The static thrust of the tail rotor, of a helicopter hovering, for example, is equal to the torque applied to the main rotor divided by the distance between their respective axes.  Once the pilot pushes a pedal, the balance is disrupted, and the heli turns.

Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout

### RE: static thrust of tail rotor in pounds????

(OP)
Thanks Steven for the answer.  The torque value for the main rotor I'm out to lunch on .  What would be a rough estimate of static thrust for a 6 foot diameter tail rotor say for a 4 person copter???  400lbs ??? 800 lbs??? I just figured the answer would be a common knowledge thing for people into helicopter flight.Maybe I'm out to lunch on that too.
Thankyou ED

### RE: static thrust of tail rotor in pounds????

There are a lot of variables to consider if one is to just calculate the required rotor torque.  Any guess without a lot more info would be, as you say, "out to lunch".

BTW, torque is measured in ft·lbs.

Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout

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