Need help

[cantw8tofly]

I have a trex 700 nitro pro with a Robird controller. I bought it ready to fly and the seller programmed my T7c for me.

About a month later my T7c shot craps on me ad would no longer transmit. I purchased a 14SG and set it up the best I could with the old settings I had in the T7c. First thing I noticed was that my swash plate was no longer level at low throttle. Then I also noticed that I have an extreme amount of negative pitch at low throttle and not any where near enough positive pitch at half stick and full throttle.

I have been fighting with this thing for a month now and im so pissed off that im ready to just sell the damn thing and forget about it. But I love this heli and just want to fly it again so I need some help.

I try to adjust the settings in the controller to make everything level and get the correct pitch to fly. Then the program tells me that I am out of adjustment and I need to adjust the servo arm.

This is where I am very confused. Why would I have to adjust the servo arms if I never moved anything mechanical? I thought maybe it would be best if I just reset the controller and started from scratch. This turned out to be a HUGE mistake as now its so messed up that I have no idea how to even begin to fix it.

Should I take the controller out and make sure that all my servo are centered and level with just the receiver before I try and set up the controller?

I really need help if someone has the time.

Thanks

[Mercuriell]

You shouldn't need to adjust your transmitter at all, just set swash type to single servo (H1) and all trims and subtrims to zero. Then start afresh with your Robird and work through the very nice setup menus on the PC software.

It's probable that the channel outputs are quite different between your new Futaba and previous transmitter, for the same stick positions. One of the first tasks in FBL setup is to calibrate the FBL to the stick centre and travel extremes of the transmitter - hope this helps!

[PowerDyne]

My suggestion here would be to look into some Adjustable Servo Arms that fit your servos output shaft spline.

If they are Futaba Splined (25T) then KST and Protek both make servo arms that should work for you.

JR Splined servo arms of the adjustable variety are also available.

If you are getting the servo arm too far out error, it's more of a warning than anything else. You really do need to get them as close to centered without subtrim as you can but with some servos you just can't. That's where looking into those adjustable arms is going to help a lot.

Aloft Hobbies carries the KST Arms
https://alofthobbies.com/kst-alloy-2...servo-arm.html

You want to set up your Tx as H-1 Swash. Then make certain your pitch curve is linear 0-100. calibrate your Tx to the Robird so all your channels move the correct way.

Go to mid stick, and set up the servos using the adjustable arms. Basically, you just install the servo arm hub, then the arm itself slips onto it, and you lock it in place with two screws.

Your servo ball distance from center will also need to be within a specific range. Robird recommended distances may vary from the manufacturer's specifications. In that instance, go with the manufacturer's recommended ball distance, and if that throws things too far out on the geometry for the Robird, then you can use the Robird recommended distances to see if that helps.

As for the difference in the upper and lower pitch ranges, you have to set that up in the Robird software. It may require lengthening or shortening your servo to swash links, and your swash to grip links as well to get even throws.