Gyro Gain on Futaba

[deej101]

Hi Everybody,

Apologies in advance, but I new to all of this. I was given a Futaba FP-T7UHP PCM/PPM transmitter with a FP-R128DF Duel rate receiver along with a nitro heli.

I dont believe I have the guts to fly the Nitro yet, so I purchased a second hand trex450XL to start with etc. I keep hearing and reading alot with people mentioning Gyro Gain on the transmitter to rid tail wobble. But I have hunted high and low through the transmitters menu's and through the manual, and I cannot find mention of Gyro Gain.

From looking at the transmitter it appears to be quite a number of years old. So my question is, does this transmitter have this setting or can it be implamented through ATV or any other settings within the transmitter?

If not, could any one suggest a transmitter? I dont have stacks of ££, so something affordable and future proof(ish).

Thanks in advance
Deej

[robgt]

The gyro gain will likely be controlled from the ATV on channel 5 (if your gyro gain plug is connected to channel 5 on the receiver).

Cheers,
Rob

[deej101]

Hi Rob,

Thanks for the quick reply. Could you advise what settings on the ATV I would use? It has a range of 30-110% for both up (Rate) and down (HH).

I have it connected to CH7 as CH5 is somehow linked to Pitch control.

Thanks again
Deej

[Made2Fade]

Channel 6 should be your pitch mate... then you can add your gyro gain to either channel 5 or 7
What gyro is it and what tail servo are you using?

[robgt]

Is the heli a 450 XL CDE or HDE (CCPM or mechanical mixing)?

Sounds like the setup needs a going over to make sure it's good to fly...

Also, those ATV numbers sound odd - maybe it's peculiar to that radio and I'm not familiar with it.

If you have the full range of percentages available to you on both sides of the switch (rate and HH modes) then a good starting point on a GY401 gyro is 40% (based on a 0% to 100% scale).

Increase or decrease as needed. Other gyros may need a different starting "safe" value...

Cheers,
Rob

[deej101]

Hi Rob,

Pitch is indeed CH6. If I connect the Gyro gain to CH5, and I flick the switch, CH6 twitches to centre and becomes non responsive until the switch is flicked up. Hence why I have it connected to CH7 as nothing appears to happen except for changing modes on the gyro.

The Gyro is a SKYA LX303 JB-08 with a SG90 servo (had a stock Align servo already fitted when I bought it).

Bare in mind Im just starting off, and I dont want to spend the world on this (just yet), so £40 odd servos are not possible at the mo.

Thanks
Deej

[robgt]

I would recommend going through every page of settings in your Tx and making sure it is set properly. It sounds like switches have been assigned oddly and should be sorted out before you go much further to avoid headaches.

Hopefully someone with a good grasp of this Tx will pop up to help you with switch assignments, if necessary.

Cheers,
Rob

[deej101]

Thanks for your super fast replies Rob. I was expecting a long wait. But im very impressed.

The thing is I have been through the menus and set any control not recommended to INH (Inhibited) so, essentially its at its minimum. I cant see any Channels assigned anywhere or any mixing (as they're off).

Deej

[robgt]

There are two menu sections on modern Txs - I'm not sure how old this Tx of yours is?

Example, on the Spektrum DX7, the model selection menu is accessed by pressing the buttons normally pressed to enter the main menus, but doing that while the Tx is powered off, then powering it on with those buttons pressed in.

There could be a similar option on your Tx - and there could be switch assignment options in there?

Do you have the manual for the Tx?

Cheers,
Rob

[deej101]

I found an electronic manual for it, downloadable from this link:

http://www.futaba-rc.com/manuals/notes-7uhf-7uhp.html

Unless I have missed it, there is nothing there for any hidden menus.

Deej

[robgt]

Just had a quick scan through the manual and stopped at the section on swashplate types.
If your heli is a CCPM heli, I'm not sure this Tx will work with it?
The manual stats it has 2 swashplate options. 1 Servo mode, which is used for mechanical mixed helis (swashplate balls are 90° apart) and 2 servo mode, which I have no idea about? CCPM would be 3 servo mode which is not listed in the manual.

Cheers,
Rob

[deej101]

Im using the transmitter with a Trex450 HDE. All works fine, appart from a bad tail wobble im getting, and everywhere suggests upping the gain. I've played with the ATV for CH7 (Gyro gain connected to), and unless there is something else wrong with the heli, the wobble wont go!

So finding out if I 'can' adjust the gain in some way would put my mind (and flying) at ease.

Im getting the destinct impression that this transmitter might be best past its use by date.

[paulh]

I don't think it's the transmitter that's at fault. If you get a tail "wobble" I assume its a horizontal wobble, Then you need to LOWER the gain settings.

I still have a FF7super fp-t7ups and it still works although I did buy a new tx as it didn't support ccpm mixing that said you can buy a box that does this for you mounted on the heli. Don't bin the tx yet it can alter the gain setting.

[deej101]

I don't think it's the transmitter that's at fault. If you get a tail "wobble" I assume its a horizontal wobble, Then you need to LOWER the gain settings.

I still have a FF7super fp-t7ups and it still works although I did buy a new tx as it didn't support ccpm mixing that said you can buy a box that does this for you mounted on the heli. Don't bin the tx yet it can alter the gain setting.

Hi PaulH,

Thanks for your input, how did you manage to alter the gain on yours?

Thanks in advance
Deej

[robgt]

It is likely to be set using the ATV settings on Channel 7 (where you have plugged the gain gyro lead into the receiver).

Page 8 of the manual.
Cheers,
Rob