Torque

[Caldera]

Hey All,

I few pictures, please take a look.  RPM is in the green at 101% sitting on the ground with no movement.

 

No collective no pedal:

 

No collective full right pedal:

 

No collective full left pedal:

 

Why is the torque value changing?

Caldera

Just noticed, why is the Trim Ball Moving?

Caldera

[kgillers3]

Tail rotor is connected to main rotor. When you push pedal changes tail rotor blades collectively. Increasing the tq. Left pedal in this case also can droop your main rotor when your power limited. 
 

Now I’ve never been on the ground at flat pitch and dumped a bunch of right pedal in so idk what would happen with the tq. 
 

trim ball is changing because your tilting the helicopter in roll axis by changing the thrust from the tail rotor.  If your tail wheel was unlocked you’d see it tilt still but just not as excessively. 
 

Hope this answers your question @Caldera

Edited April 16, 2022 by kgillers3

[Kharrn]

as a further "read":

or if you prefer Casmos approach:

K

[Caldera]

OK  Thanks for the replies!

That is allot of torque for just the tail rotor.  But, as you say, being on the ground and unmovable must increase it to some degree.  I am surprised that it is that much as I often fly around at 80knots (or so) with just a total of around 50% torque.  I guess a lesson in slamming the pedal when already at a high torque value.  The instantaneous value could approach what I see above.

 

The whole Trim Ball thingy still baffles me a bit me.  As seen in the thread below.  I am still wrapping my brain around it mostly because I have been overthinking it.  But I do notice from this test, that even a small amount roll (and nothing else) also effects this indication to a very noticeable degree.  Even with the aircraft not moving and firmly planted on the ground.

 Caldera

Edited April 17, 2022 by Caldera

[bradmick]

You’re at 50% Tq at 80 knots because you are near to max endurance/ rate-of-climb airspeed, which is where drag is at its lowest for the helicopter. Power required here will be at the minimum for the helicopter. Between about 65 to 75 knots the drag curve sort of flattens out before rising again at higher airspeeds requiring more torque.