Dual Rates with GPRO

[Granpappy]

Hi folks,

I've just set up my first flybarless cab, a TREX 500 Dominator with GPRO. I don't pretend to know what half the settings do in the parameter menu so I just set it to 'Beginner'.

I've noticed however that the control throws are still quite aggressive. Is it possible to set 60% dual rates in normal mode just to tame it on it's maiden flight or will this upset the GPRO contoller.

Any advice would be most welcome. Thank you.

Graham

[Rachel]

As long as you do it after the set up, I don't see a problem

[tourerjim]

When you say the throws are aggressive is this on the bench or in flight, reason i ask is when you select beginner mode the heli's cyclic is very relaxed so if you've not flown it yet I would suggest for the first flight 30% expo 20%D/R, i would be concerned if its what you've notice on the bench as this is not what happens in flight.

Ive assign a 3 position switch & set the following.
switch poss 0, 30% expo 20%D/R
switch poss 1 15% expo 10% D/R
Switch poss 2 default.
I done this for the initial flights after fitting the Gpro's & now i only use switch poss 2

[Granpappy]

On the bench. Perhaps I should bite the bullet and fly it and see what happens. The one thing I did notice on the TR setup is that when you set the travel limits in GPRO you end up with 25% stick movement either side of central doing nothing. I've set the ball link on the servo arm as close to the center as possible but there is still to much travel for the slider on the TR hub. Maybe it's worth setting dual rate on the Tx before setting up on GPRO so at least you get control movement over the full range of stick movement. Perhaps I'm thinking too deeply and should just go and fly the thing. :-)

[tourerjim]

On the bench. Perhaps I should bite the bullet and fly it and see what happens. The one thing I did notice on the TR setup is that when you set the travel limits in GPRO you end up with 25% stick movement either side of central doing nothing. I've set the ball link on the servo arm as close to the center as possible but there is still to much travel for the slider on the TR hub. Maybe it's worth setting dual rate on the Tx before setting up on GPRO so at least you get control movement over the full range of stick movement. Perhaps I'm thinking too deeply and should just go and fly the thing. :-)

In the gpro software edit setup there is a setting were you set the tail slider travel limits, you need to set this prior to any D/R & expo.

From what your saying you've done this & with beginners mode you should be fine.

[Granpappy]

I will post how it works out. The one thing I am not comfortable with is full yaw range with about an inch of stick movement. I know with the old gyros you used to have to set the end points by programming them into the gyro, but I used to set the dual rate on the Tx yaw control before setting the gyro. That always worked and I would have good range on the Tx stick.

[coolice]

Hey Buddy.

Don't worry too much about what you see on the bench as far as control throw and reaction, as the FBL gyro's are rate demand and so throw in the required pitch change to achieve the desired rate or rotation/yaw asked for by the pilot. WHen the model is static the FBL unit doesn't notice a change in the models attitude and throws in more control deflection to get one.

With the Gpro and any FBL unit really, the main focus is on the bench setup, get this right and the rest becomes easier. The Gpro is very intuitive and as long as you follow the on screen instructions you will be fine.
When doing the setup leave all channel dual rates and exponential at zero, then once setup go back in a dial in the D/R's & expo you want to run.

With the control throws, taking the tail as an example as you've mentioned it, this can be adjusted up or down within the PC software. As you may then remember from years back it is a balancing act of choosing the right length servo arm to keep the travel limits as close to or slightly above 100% to maintain perfect resolution.

Keep us posted and any questions please fire away.
.

[Granpappy]

It's a dream. It's rock steady and I'm grinning like Cheshire cat. I love GPRO and everything in the setup procedure is so logical. I set the gyro to go from AVC to Norm on switch B for tail following on circuits and that worked a dream as well. The only thing I forgot to do was copy the Norm pitch curve over to Throttle hold. When I hit throttle hold on landing in nearly splayed the skids. Whoops. But it didn't half run down quick. Lol.
Thanks to everyone for your great advice. I'm now officially a Flybarless fan.

[tourerjim]

That's great news & good for a review for others thinking of getting a Gpro as it hasn't done so well since its launch.