Futaba 8J

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07 Nov 2017 17:48 #14528 by Simon O
Futaba 8J was created by Simon O
I could do with some help guys.
I have put a 6 channel Futaba s-fhss receiver in a model of a WACO that I have put together. Ch1 is ailerons, 2 is elevator, 3 is throttle, ( in my case it's to the speed controller) and ch4 is rudder. I have bound the receiver, but I'm having problems getting the ailerons to function. All other functions work correctly. The aileron servos are on a Y lead. What ever I do the servos work together in the same direction. I have connected the servos individually to ch1 and they will operate as you would expect. I have taken out the Y lead and put the servo plugs in ch1 and ch6. Still both servos work in the same direction of travel. All settings in the transmitter are factory settings. Any ideas how I can get the servos turning in the left/right directions as I need them to be?
Ideas gratefully received
Simon

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07 Nov 2017 18:07 #14529 by kevinross
Replied by kevinross on topic Futaba 8J
I would never use a Y lead with separate aileron servos. Far more logical to use ch 1 & 6 - then reverse the channels as required. Using two channels, you can program individual end points and differential.
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07 Nov 2017 18:32 - 07 Nov 2017 20:07 #14530 by Phil Ford
Replied by Phil Ford on topic Futaba 8J
I assume you are using two aileron servos Simon. The Y lead is not the issue , it is just sending an identical signal. So then one of them is installed the same way round as the other, ie output shaft both facing same way. Either that or one of them is rotation reversed.See images below

Note: I have found on quite few HK models and such like have a factory reversed servo in one wing. Century Riot did so I found out. Had to buy the servo set just to get the right one.:(

Image 2. No good unless you are able to reverse servo.
image 1. What you should have normally
Last edit: 07 Nov 2017 20:07 by Phil Ford.
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07 Nov 2017 18:53 #14531 by Simon O
Replied by Simon O on topic Futaba 8J
Hi Phil
The servos are not specified by hobbyking, however I found a piece on you tube where someone has put one together, shown it flying and given the info on which tunigy servos they used, I copied their spec, however they did not specify 'aileron servos' just a model number
Simon

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07 Nov 2017 19:02 - 07 Nov 2017 19:09 #14532 by Phil Ford
Replied by Phil Ford on topic Futaba 8J
Is this the 1300mm Waco bi-plane as below ? Can you upload a picture of how the servos are mounted anyway?
Last edit: 07 Nov 2017 19:09 by Phil Ford.

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07 Nov 2017 19:19 #14533 by Simon O
Replied by Simon O on topic Futaba 8J
Yes Phil it's the 1300 Hobbyking. I'm not familiar on how to upload pics to the forum I'm afraid.
Simon

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07 Nov 2017 19:33 - 07 Nov 2017 19:35 #14534 by JRI
Replied by JRI on topic Futaba 8J

kevinross wrote: I would never use a Y lead with separate aileron servos. Far more logical to use ch 1 & 6 - then reverse the channels as required. Using two channels, you can program individual end points and differential.

Totally the right way to go!!! Wont' cost you more than a couple of quid to bin the Y-lead and put in two servo extension leads instead.
Last edit: 07 Nov 2017 19:35 by JRI.
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07 Nov 2017 19:57 #14535 by Simon O
Replied by Simon O on topic Futaba 8J
O.K. I have plugged the servos directly into channel 1 & 6. Servo on 1 works fine, the servo on chan 6 not responding at all.

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07 Nov 2017 19:58 #14536 by Simon O
Replied by Simon O on topic Futaba 8J
My setup is pic 2 Phil

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07 Nov 2017 20:00 - 07 Nov 2017 20:09 #14537 by Phil Ford
Replied by Phil Ford on topic Futaba 8J

Simon O wrote: Yes Phil it's the 1300 Hobbyking. I'm not familiar on how to upload pics to the forum I'm afraid.
Simon


My setup is pic 2 Phil Sorry my error. I have edited that post. Please re-read it. Oooh! Then one definitely needs reversing.:(

Oh well. Simple answer is put one servo on a different spare channel and mix them together, therefore being able to reverse on the TX the servo direction of the problem servo. Problem solved.;) Make sure that no switch is assigned to Ch6 (normally flaps). Don't ask me regarding the mixing as I am a JR and Taranis man.:lol:
Last edit: 07 Nov 2017 20:09 by Phil Ford.
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