Vortex Unequal Piro Speeds

[waveydavey]

Anyone noticed that left and right piros are different speeds, or is it just my aging eyes. Got a good mechanical setup and gone through the setup again just to check but can't see a reason for it. Left is fine but right is slower

[GIXERMAN]

your Eyes Dave, moving on

[Granpappy]

I guess the tail rotor has to do more work against the MR torque turning right, and less work with the MR torque helping turning left.

[waveydavey]

I get that, but if I ask a gyro for 500 degrees per second then I expect the gyro to take care of it if it isn't. That's what I'm saying the mechanical setup is equal IE same travel either side of centre so if I can get the required one way then I would expect it to be the same the other way. It may be my eyes and theres no scientific way of checking it I suppose apart from someone with a stopwatch

[Granpappy]

Maybe this goes back to the old discussion of setting up the tail rotor in rate mode.

[raptorheli2]

I helped someone a long time ago with same complaint.......it was just deception as 10 piros either way with a stop watch proved.

[waveydavey]

Okay, I'm all ears, how will setting the tail up in rate mode adjust the rotation speed left and right. I can see it helping with stops but the rotation rate I don't get

[waveydavey]

I helped someone a long time ago with same complaint.......it was just deception as 10 piros either way with a stop watch proved.

I'll try that you might be right

[coolice]

Maybe this goes back to the old discussion of setting up the tail rotor in rate mode.

Hey Buddy.

I was going to suggest this, but in reality the rate mode setup usually only effects the stops.
During a pirouette, as Dave has said, it is the gyro itself which is commanding the tail to piro at a given rate of rotation in degrees per second based on the amount of stick input from the pilot, as they are rate demand. The same applies to the cyclic gyros.

Definetly the torque reaction will have an effect on the tail rotor performance to some degree, so maybe the Vortex can allow the pilot to tune the left & right piro rates to counteract any slight inaccuracy.

Ian

[coolice]

Okay, I'm all ears, how will setting the tail up in rate mode adjust the rotation speed left and right. I can see it helping with stops but the rotation rate I don't get

Hey Buddy.

In theory it can help, as the neutral position of the tail rotor blades will be applying tail thrust against the torque reaction of the main rotor on the fuselage, so tail thrust against the torque will be greater due to the increased tail pitch in that direction.
However as you have said, the modern rate demand gyro's control the piro/flip/roll rate of the model and not the amount of pitch/thrust the various rotors provide.

It might be worth trying, nothing to loose.

Ian

[coolice]

I helped someone a long time ago with same complaint.......it was just deception as 10 piros either way with a stop watch proved.

This will be fun to watch.... 1, 2, 3, 4..... ah balls I lost count :-) Start again.

Ian

[Granpappy]

Good point Ian. I'm thinking that the torque reaction is more likely to affect the turning speed. An analogy would be the difference between driving a car uphill compared to downhill depending which way the heli is turning.

[maddog7]

The other thing to consider at near max piro rate would be blade stall, past about 15 degrees you'll get no further thrust. If you're near that in both directions one way will be slower than the other despite the yaw rate demand. I'd think your piro rate would have be blinding to have that happen though.
All of that said, I've had similar situations occur a couple of times and just turned down the travel in that direction. Not with the Vortex though.
Cheers
D

[maddog7]

Could use a 120 fps smartphone to video it and work it out from that...............

[George J]

Just speed up or slow down one side, job done.