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Aug 09, 2019, 10:52 PM
Corsair Guy
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HiTec TTX650 Transmitter/Flaps Question


Hello.

I recently bought an E-Flite Timber 1.2 PNP. I have a Tactic TTX650 transmitter and I installed a Tactic TR625 receiver in the plane. The plane flies great. But I can not figure out how to get the elevator to coincide with the flaps with a three position toggle switch. I had no problem with my elevator and flaps with my De Haviland Beaver, when I hooked that up.

Anyway, I have been through the radio manual several times and have not figured out what I need to accomplish this.

The problem can be described as: when I put the 3 position flap switch into position number 1, the flaps move down just a little - where in actuality, they should not move at all, as that is the normal "flap up" position. Next, when I move the flap switch into position number 2, the flaps return to "normal up" position. Finally, when I move the toggle switch to position number 3, the flaps drop to full deflection.

I am about at my wits end in trying to figure out as to why this is happening. If you have any thoughts at all, it would be much appreciated.

Thank you very much.

Jim
Last edited by corsairguy; Aug 10, 2019 at 10:21 PM.
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Aug 13, 2019, 06:47 PM
AA6JB
Bajora's Avatar
Jim

I am pretty sure Hitec has nothing to do with the Tactic line of radio transmitters? They were one of Hobbicos brands.

It has been a while since I owned or played around with a TTX650 or TTX850 transmitter but I don’t recall the flaps being that difficult to configure? I think pages 25 and 26 of the manual may help you? (Link HERE)

I think adjusting the circled values (in the jpg below) will control your flap deflections for each of the three switch positions? But without a transmitter here in front of me, and with my bad memory, I cannot be 100% sure.
Last edited by Bajora; Aug 13, 2019 at 06:59 PM.
Aug 19, 2019, 09:07 AM
Corsair Guy
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Timber Flap Rudder Fix


Wow, I get to answer my own question.

I got it figured out and it now works fine. First, I removed the propeller from the motor, which is always a good thing to do when working on a plane and making adjustments. Next, I removed the flap servo covers. Then I unscrewed the 3 screws that hold the plastic triangular plate that holds the servo down and in the servo mount. Next, I pulled the servos up and out of the servo holders. From there, I was able to remove the servo arm. Once the servo was free, I turned on the transmitter and connected the battery to the receiver. In observing the servo movement, I then replaced the servo arm back on the servo spline........., but not at its original location. I moved the arm several degrees and then put it back on the servo. This turned out to be fairly close to where it needed to be with the flap in the full up position. I repeated the process and then had the full up flap position exactly where I wanted it. Then I lowered the flaps to half way down and they worked properly and then finally to full flap down and that worked great too. So I then repeated the whole process for the other flap and they both work fine. Note: I did have to remove some wing material from the servo arm area - for clearance - and some more material that was under the linkage and the clevis also because of "binding" in that area.
Aug 19, 2019, 09:13 AM
Corsair Guy
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Timber Flap Rudder Fix


Hello Bajora.

I figured out, back on August 11th how to do this, so I get to answer my own question. I had also posted my question on Hobbysquawk, with no results, but my perserverance and process of elimination helped. However......., thank you so very, very much for all of your help here and the time and effort that you put into your response. That is very much appreciated.
Thank you again.
Jim

I got it figured out and it now works fine. First, I removed the propeller from the motor, which is always a good thing to do when working on a plane and making adjustments. Next, I removed the flap servo covers. Then I unscrewed the 3 screws that hold the plastic triangular plate that holds the servo down and in the servo mount. Next, I pulled the servos up and out of the servo holders. From there, I was able to remove the servo arm. Once the servo was free, I turned on the transmitter and connected the battery to the receiver. In observing the servo movement, I then replaced the servo arm back on the servo spline........., but not at its original location. I moved the arm several degrees and then put it back on the servo. This turned out to be fairly close to where it needed to be with the flap in the full up position. I repeated the process and then had the full up flap position exactly where I wanted it. Then I lowered the flaps to half way down and they worked properly and then finally to full flap down and that worked great too. So I then repeated the whole process for the other flap and they both work fine. Note: I did have to remove some wing material from the servo arm area - for clearance - and some more material that was under the linkage and the clevis also because of "binding" in that area.


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