DX7 Gyro switching help

[Streetluge Chris]

I have watched all the videos but I am still going wrong somewhere.
I have set the Gear channel to Gyro
When Gyro sens I have put in
Rate
0:35%
1:70%
F.mode
norm:0
Sunt:1
Hold:1
But when I flick the gear switch it does not switch from H/H to Rate.
I have been told that u should always fly H/H anyway.
If I set the f.mode norm to 1 In stays in H/H
How should it be set up?

401 clone gyro

[wibplus]

Hi, on my DX7, the gear channel is set to gear. That makes the gear switch work.
The % settings on the gear channel endpoints I have set at +75% and -75% and the gear switch then is able to switch from HH (upper position on switch) to Rate (lower position on switch).
Those % values work for me, you might need to use your own values for your settings.
Hope this helps.

[trillian]

Yeah, when you setup the gyro to 'auto' it only enables switch position 0 or 1 per flight mode. So flipping the switch will have no effect because the gyro gain is being selected by the flight mode.

If you want to be able to flip the switch in the same flight mode, for example when flying in normal mode to flip the switch from 35% gain to 70% gain. You'd need to set the gear switch to 'gear' instead of 'gyro'.

What happens then is you use the ATV values to set the gain. Keeping in mind the ATV on the DX7 is 150, so the number you'll get will be higher than the actual gyro gain percentage since 150 increments are spanning the range of 0 to 100% (so for example 70% gain would show as something like 105 on the travel adjust). But this way one value can be set when the switch is up and another when the switch is down and this will apply to all flight modes.

Since I never want to accidentally go into rate mode I have mine setup uisng the gyro menu and just set the gain for HH and use the same for all flight modes.

[Streetluge Chris]

Whats best? Should i just set so it in H/H all the time by changing FLT to 1.
Also how are the end points set (gyro 401 clone)is it in the DX7 or the gyro.

Should I set the tail servo up in rate mode or H/H ok
I am a slow learner but getting there.

[wibplus]

Whats best? Should i just set so it in H/H all the time by changing FLT to 1.
Also how are the end points set (gyro 401 clone)is it in the DX7 or the gyro.

Should I set the tail servo up in rate mode or H/H ok
I am a slow learner but getting there.

Hi Chris, set the tail servo up first. You should have the mechanical setup correct before attempting to set the gyro up. Do not use trim on the rudder settings to get it mechanically right. It will never be right if you use trim.

Next, set up the travel on the tail slider so that it goes end to end without actually touching . This is done with the gyro itself (if it's the same as the GY401).

Next, set the tail up in rate mode so that it will hover without drift.

The endpoints in the DX7 (channel 5) will set the piro rate. That determines how fast the heli will turn or pirouette.

You can then decide whether to always use HH mode or, if you wish, you can have both HH and rate modes available.

Cheers, Bill

[coptermanic]

Personal choice:
The GY401 prefers to initiate in HH. And I prefer to fly my 600 in HH, so irrespective of my flight mode, the gyro is always in HH. However, I have selected the RUDDER D/R switch to activate the gyro from HH to RATE, so that I can check things out, or release the HH momentarily.

AUX2 ch - F.MOD GEAR ch - GYRO
GYRO SENS - RUDD D/R,
and I set the gain % at the GYRO SENS menu option.

But as ever, there are other ways to do it. This works for me, and I understand what is happening, which is not usually the case for me and electronics!!!

[barryorbik]

Thanks to all you guys for answering a question I was about to post, as I have just acquired my first HH/rate gyro and was wondering the same thing.

Have fun

Barry

[trillian]

I will just add to the above. Using the GY401 I do not ever touch rate mode. (I can always get rate mode simply by lowering the gain setting to below 50% but I have no desire to fly in rate mode)

I setup the tail linkage mechanically so that the servo centre puts the servo horn at roughly 90 degrees and the tailrotor is at zero pitch. I then set the travel limit on the gyro so that the pitch slider goes all the way but does not touch the ends causing any binding / stress on the servo. This often requires a bit of fine tuning of the linkage using the ball link at either end until you get maximum travel in both directions. The travel adjust for the rudder in the TX will control how fast the piro rate is. I generally leave it at 100.

Once the mechanical setup is done I set the gain at an approximate value (around 65/70% gain) and then fly the heli to see if there is any drifting or wagging.

Sometimes with the 401 you may have a wide gain range in which it seems to hold just as well. My latest heli uses a GY401 and Align 650 servo. I started at 70% gain and it flew fine with no issues. I bumped it up to 80% and still no wagging.

[coptermanic]

+1 on that set-up Sheryl.

[Streetluge Chris]

I will just add to the above. Using the GY401 I do not ever touch rate mode. (I can always get rate mode simply by lowering the gain setting to below 50% but I have no desire to fly in rate mode)

I setup the tail linkage mechanically so that the servo centre puts the servo horn at roughly 90 degrees and the tailrotor is at zero pitch. I then set the travel limit on the gyro so that the pitch slider goes all the way but does not touch the ends causing any binding / stress on the servo. This often requires a bit of fine tuning of the linkage using the ball link at either end until you get maximum travel in both directions. The travel adjust for the rudder in the TX will control how fast the piro rate is. I generally leave it at 100.

Once the mechanical setup is done I set the gain at an approximate value (around 65/70% gain) and then fly the heli to see if there is any drifting or wagging.

Sometimes with the 401 you may have a wide gain range in which it seems to hold just as well. My latest heli uses a GY401 and Align 650 servo. I started at 70% gain and it flew fine with no issues. I bumped it up to 80% and still no wagging.

Thanks everyone
this is what i have i have done I had to turn the pot down alot on the 401to around 60 70 to set the end points.Is this to much.
Also I seem to have zero pitch on the tail is that wright.

[coptermanic]

If you set the gyro up to initialise in HH, when you power up, there should be no pitch on the tail blades, and the slider should be mid shaft.

When the rotors start turning and torque is then created, the gyro will sense the turning and react by putting correcting pitch to the tail blades which counters the torque. Exactly the same as what happens in the air!!

[Streetluge Chris]

Thanks a lot for I now understand it alot more next is throttle curves and pitch.

[coptermanic]

......go on.................