Throttle hold on the DX7

[groos]

When i use the throttle hold switch, not only the throttle moves to the zero position, but also the pitch decreases with about 8 %. This is also shown in the monitor function.
All the mix programms are inhibited.

What do i wrong??? Or is this a normal setup in the dx7?

Geerten, Holland

[BarracudaHockey]

Throttle hold has its own pitch curve.

[groos]

Thanks Andy, this problem is solved.
Is it also possible to set the rudder to a zero degree setting during throttle hold?

[BarracudaHockey]

What heli/gyro we talking about?

[groos]

It's a Hirobo gph 346 and a robbe 3d gyro.
It's a gyro with headinghold en normalmode.
I set the gyrogain channel to the gear switch.
Gear: +65% and - 65%
Rudd: L:70% R:70%

[BarracudaHockey]

I dont know if that has a driven tail or not, if it does leave it in heading hold, if not force the gyro to rate mode and I believe you can set an offset (i dont have one of those radios in front of me but I remember Ray doing it in his dvd series) that drives the t/r to 0 degrees pitch.

[DavidH]

Just my opinion. But if the tail is NOT driven. There is no reason to change the gyro from HH to normal mode. NON driven tail means the tail does not turn during an autorotation. So if the tail is not turning, no reason to change gyro modes. The gyro is not doing anything if the tail is not turning.

David

[groos]

Thanks,

The gph-346 has a driven tail rotor. So what do you suggest?
I want the tail rotor in the zero degree position. Or is the hh function enough to keep it there.

[DavidH]

Leave the gyro in HH mode. I have been using HH gyros for 10 years now. Only time they have been in Normal rate is for initial setup. LOL

David

[BarracudaHockey]

I'll explain my reasoning David.

On a non-driven tail with the gyro in heading hold any rotation of the boom will result in the gyro holding the tail pitch hard over. If you need to or decide to bail from the auto, with the gyro in HH mode the thing will do a piro or three before the tail rotor rpm comes up and the gyro gets hold of it. For you and me that might not be as much of a problem as some other people so I find it best to set newbs up to put the gyro in rate mode in throttle hold on non driven tail helis.

Driven tail, just leave it in heading hold and let it do its thing.

[TMoore]

I'll explain my reasoning David.

On a non-driven tail with the gyro in heading hold any rotation of the boom will result in the gyro holding the tail pitch hard over. If you need to or decide to bail from the auto, with the gyro in HH mode the thing will do a piro or three before the tail rotor rpm comes up and the gyro gets hold of it. For you and me that might not be as much of a problem as some other people so I find it best to set newbs up to put the gyro in rate mode in throttle hold on non driven tail helis.

Driven tail, just leave it in heading hold and let it do its thing.

Andy,

Rate mode will do it too. I've seen it. This is why I'm of the opinion that it doesn't matter.

TM