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Parkzone ultra micro T-28 Trojan (RTF) problems

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J Myers III21/04/2012 21:25:33
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So just over a week ago I recieved my Parkzone ultra micro T-28 Trojan from Kings Lynn Models. I have flown it once with no problems. But today I set it all up and I noticed the aircrafts elevator is not working. I opened up the fusalage to check if anything was not plugged in but the only things I can plug in or out is the rudder servo lead and the motor lead.

I don't know what to do, should I connect the rudder servo to the elevator so that left/right (rudder) will control the elevator?

Allan Bowker21/04/2012 22:57:11
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Swapping over the servo's to another channel is a good way of testing things.

I would give Kings Lynn Models a call on Monday, their service has always been good for me.

J Myers III21/04/2012 23:01:07
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Thanks for the reply, is it possible to swap them on the transmitter that came with it? As I got the RTF version.

And yeah I will defiately give them a call, have you had a similar experience? If so what did they do? Thanks in advance!

Alan Randall21/04/2012 23:01:36
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Sounds like a warranty issue to me if the linear servo is not working.

I would have expected it to be the aileron lead that plugs into the receiver board, as the rudder and elevator are usually driven by the two linear servos on the board.

Do both servos on the receiver board move, as I have known the heat shrink on the push rods to come loose so that the push pull motion is lost on a push rods.

J Myers III21/04/2012 23:07:32
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Yeah, it's the aileron lead that plugs into the receiver and the rudder and elevator servos are on board. What part is the heat shrink?

Biggles' Elder Brother - Moderator21/04/2012 23:18:38
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A bit of coloured tube shrunk on to the end of the push rod to hold the wire in place.

BEB

Alan Randall21/04/2012 23:24:16
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The push rods are often in two parts and are joined by overlapping the two parts and fastening them using black heat shrink tube. Sometimes the heat shrink is not tight enough and allows the two parts of the push rod to slide past one another rather than operate the control surface. I have had this problem with a Park zone Micro Cub. Not sure without looking if the T28 push rod is the same, but I would guess it is as I would imagine that's how the factory zeros the control surfaces during manufacture. I would expect the heat shrink join to be near the adjustment bow in the push rod, or near the servo.

Edited By Alan Randall on 21/04/2012 23:25:17

Edited By Alan Randall on 21/04/2012 23:26:43

J Myers III21/04/2012 23:34:55
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@ BEBUltra micro t-28 trojan

Allan Bowker22/04/2012 16:24:34
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Are all of the 3 linear servo's moving?

You should be able to see them moving the black push rods with the top off the plane and the battery connected.

A linear servo

Alan Randall22/04/2012 16:34:34
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J Myers III22/04/2012 18:30:52
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181 forum posts
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The rudder and the aileron servos move but the elevator is dead.

Simon B22/04/2012 21:05:50
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Glad I saw this thread. I have one and the servos are just chattering wildly and only the motor is responding to controls. I was worried it was something i'd done, but I'll get it off to Horizon tomorrow.

Alan Randall22/04/2012 21:20:39
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446 forum posts
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I would say you have two alternatives, either return it all to KLM, or carefully remove the receiver/servo board and return it to Horizon with proof of purchase. You could ring them first and see what they say, I have always found them helpful. I suspect they will send a new board.

Simon B22/04/2012 21:24:14
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1936 forum posts
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I'm just posting the plane over rather than trying to prise the boards out...

Allan Bowker22/04/2012 22:44:53
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1627 forum posts
227 photos

If the elevator servo isn't moving then it could be caused by a fault on the board, motor or jammed gears.

I would speak to Horizon Hobby or Kings Lynn Models to see what your options are Ghost.
Seems like a return under warranty.

J Myers III23/04/2012 07:20:18
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181 forum posts
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Thanks for the advice guys, I'll give KLM a call later today. yes

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