Parkzone Sukhoi su-26xp rudder problem
01-26-2011 | 05:40 AM
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Parkzone Sukhoi su-26xp rudder problem
I bought a parkzone su-26xp last week.
I've binded it to my dx6i and am using the recommended 'Normal' settings for DR and expo. When carrying out preflight checks I noticed the rudder is binding. It fails to return to center after input and stays around 2 or 3 degrees short of straight. I can straighten it out with a little opposite input but that's no good once it's in the air. It also suffers from servo chatter as soon as the flight pack is connected. Are they all like this?
I've binded it to my dx6i and am using the recommended 'Normal' settings for DR and expo. When carrying out preflight checks I noticed the rudder is binding. It fails to return to center after input and stays around 2 or 3 degrees short of straight. I can straighten it out with a little opposite input but that's no good once it's in the air. It also suffers from servo chatter as soon as the flight pack is connected. Are they all like this?
01-26-2011 | 05:52 AM
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RE: Parkzone Sukhoi su-26xp rudder problem
The "bind" can be from several things. Start off by removing the linkage from the servo and see if the servo travels the full range and returns to center when you put the rudder stick on the DX6i back to center. If it does not return to center on it's own, meaning after you move the stick to the right then back to center and the servo does not go back to center, then it's a servo issue. If it does, then it may be that the servo linkage just isn't connected up so that it centers after release.
It could also be a bind in the linkage itself. To check that, again, disconnect the linkage from the servo and move the rudder by hand and see if you detect a binding in the linkage. If so, then try to find where it is binding and fix it. It may be just a matter of a bent pushrod or perhaps something in the fuselage hole that is causing it to bind.
CGr
It could also be a bind in the linkage itself. To check that, again, disconnect the linkage from the servo and move the rudder by hand and see if you detect a binding in the linkage. If so, then try to find where it is binding and fix it. It may be just a matter of a bent pushrod or perhaps something in the fuselage hole that is causing it to bind.
CGr
01-26-2011 | 01:37 PM
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RE: Parkzone Sukhoi su-26xp rudder problem
I have to older PZ 26. I had the same issue with the elevator. It was caused by the way the top have of the fuse was taped on. (created inteference with the control surface wires). And also found one of the control wires was underneath the servo arm. The control wires are very sensative to any interference.
01-26-2011 | 04:01 PM
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RE: Parkzone Sukhoi su-26xp rudder problem
Hmmm Ok, Bill. That's something to put in the notes section of my next book!!! 
just kidding.
Servo/control surface problems can come from a lot of things, many are not the usual problems we face with glow power, as you so well pointed out.
What's tough is the way the smaller electrics are constructed.. with really flimsy - light-weight control rods that really need care when working with them. Add to that what you found, well, you can end up with a real problem child. Hope that clears up his problem. Sounds reasonable.
I have one of those XPD8's that have the electronics in a small compartment on the top, under the "canope". Not a lot of room, and the servos are mounted in a sort of wierd position on the side of the fuse. I have not flown it yet, but I imagine that this thing would be one of those prone to strange problems too. That's one solution I will have to keep in mind when I play with that beastie.
CGr.
just kidding. Servo/control surface problems can come from a lot of things, many are not the usual problems we face with glow power, as you so well pointed out.
What's tough is the way the smaller electrics are constructed.. with really flimsy - light-weight control rods that really need care when working with them. Add to that what you found, well, you can end up with a real problem child. Hope that clears up his problem. Sounds reasonable.
I have one of those XPD8's that have the electronics in a small compartment on the top, under the "canope". Not a lot of room, and the servos are mounted in a sort of wierd position on the side of the fuse. I have not flown it yet, but I imagine that this thing would be one of those prone to strange problems too. That's one solution I will have to keep in mind when I play with that beastie.
CGr.
01-27-2011 | 09:42 AM
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RE: Parkzone Sukhoi su-26xp rudder problem
ORIGINAL: CGRetired
Hmmm Ok, Bill. That's something to put in the notes section of my next book!!! just kidding.
Servo/control surface problems can come from a lot of things, many are not the usual problems we face with glow power, as you so well pointed out.
What's tough is the way the smaller electrics are constructed.. with really flimsy - light-weight control rods that really need care when working with them. Add to that what you found, well, you can end up with a real problem child. Hope that clears up his problem. Sounds reasonable.
I have one of those XPD8's that have the electronics in a small compartment on the top, under the ''canope''. Not a lot of room, and the servos are mounted in a sort of wierd position on the side of the fuse. I have not flown it yet, but I imagine that this thing would be one of those prone to strange problems too. That's one solution I will have to keep in mind when I play with that beastie.
CGr.
Hmmm Ok, Bill. That's something to put in the notes section of my next book!!!
just kidding. Servo/control surface problems can come from a lot of things, many are not the usual problems we face with glow power, as you so well pointed out.
What's tough is the way the smaller electrics are constructed.. with really flimsy - light-weight control rods that really need care when working with them. Add to that what you found, well, you can end up with a real problem child. Hope that clears up his problem. Sounds reasonable.
I have one of those XPD8's that have the electronics in a small compartment on the top, under the ''canope''. Not a lot of room, and the servos are mounted in a sort of wierd position on the side of the fuse. I have not flown it yet, but I imagine that this thing would be one of those prone to strange problems too. That's one solution I will have to keep in mind when I play with that beastie.
CGr.
01-29-2011 | 08:55 AM
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RE: Parkzone Sukhoi su-26xp rudder problem
It was indeed the top fuselage, it was pinching the control rod. A quick trim to the foam and all is well. Thanks for the advice!
