swash plate servos , not central

[Ryoken]

well after the boom being repaired, i seem to have yet another bloody problem ,
ill try to explain , simplified.

with no power to the servos if you put them at 90 degres , the swash plate is perfectly level, power on the transmitter and the servos , (re centre themselves.
one goes nearly up to the top . (front left) looking from rear of the heli
front right one goes down alot
and the one at the rear , goes down aswell ,

i know i made a preset in the tranny for the phoenix , but im using another memory setting , so that i wouldnt have caused any porblems,
right , this is the stupid Q, when you power the heli up. should all the servos , go straight out to 90 degrese.
if they dont do i have to remove the horn and re set them so they are ?

god that was one of the most stupid questions ever

[GIXERMAN]

Disconnect motor power up, put throttle stick to middle and they should be 90 degrees, If you have crashed may have moved horn on splines in impact.

[BenScoobert]

Don't worry, we are all full of them.

Centre the servo horns as you have seen, it may not be perfect centre, you can adjust this with sub trim on your TX or setting son your fbl controller, depending on what you are using. Best to get a swash leveling tool of some kind, or use a cable tie technique. Once swash is true then level the head.

[Ryoken]

yeah i had a really , really small impact other day , just enough to put 2 lines in the tail boom (rotor impact) , no idea how it happened tbh , i was only skitting along the floor, (training balls attached)
really annoying thing is i have just paid out to get 3 new servos fitted, and a re align after the huge crash i had , and the damn things needs re doing again , this is getting to be very expensive hobby.
even if i alter the trims on the tranny they wont bring them down far enough.
so let me get this right..... you can move the servos by hand with power off, and when you power them up they will automatically center?. tranny off.
so i needs to......

remove horns from servos,
re attach so there at 90 degrees.
get alignemt tool or cable tie to align swashplate.

do servos jump out of alignment alot?

[BenScoobert]

Remove servo horns, tx on with no trim or sub trim and centred sticks, remember throttle hold or disconnect motor

power heli, servos will centre, put horns on servos at near as 90 degrees as they will go, then find subtrim in your menu and line them up dead on 90 degrees

step 1 done

it is an expensive hobby, what heli is this and tx?

[Ryoken]

kds 450 qs with a kds k7x2 tranny. Ben.

[mattscupoftea]

Did the above answer your question?
I may have missed a previous post, but if not, maybe you can give a little more information - what heli, flybarred or flybarless, servos setup from new or as they were before a crash, etc.
I guess from what you've said that you had a previous setting, so perhaps it's a repaired heli after a crash. In that case it seems strange that the servos have changed - perhaps the gears or the servo horns stripped? It may well be worth opening them up and checking, if you are confident to do that. . .

[Ryoken]

Hi. Matt .ill make it breif
bought it ,
3 days later crashed it
3 servos stripped , main rotors broke , repaired by model shop .
all ive done is scooted round the floor with my training balls on
took it to work other night , scooting on floor ,next thing i know main blades hit tail boom , again , heli poorly.
bought tail boom , repaired myself .. yay me
while i was waiting for bits , set up a profile on my tranny for the phoenix, been playing on that.

fixed heli , powered it up , swash plate servos , ALL are out of align,
and im buggered if im going to pay 60 quid for some one to re align the damn things again

[mattscupoftea]

What heli?

[Ryoken]

kds 450 qs

[mattscupoftea]

I would guess though, that when they replaced the servos, perhaps they didn't put power thru them before they put the horns on?

As far as I work out, servos have a 'range' - a bit like a dial on a stereo for example. they only centre when you put power thru them, and I would assume only when they are connected to a receiver that has a signal from a tranny.

So when you put the horns onto the servos, you would normally power them up, making sure the tranny trims and subtrims are centered, and you will hear them 'zip' to centred. Then you can set the horns to their intended 90 degree position and screw them in place.

If the servos are installed already, just unscrew the screw in the horn, prize (gently) them off, disconnect the motor (mark the leads to make sure you can get them back in the right 'order') and power up the receiver, with the tranny on already. Centre trims and subtrims, centre sticks (assuming you have the pitch curve so that you get 0 degrees at centre stick, which i think with most trannys is 50 percent at midstick) relocate the horns as instructions suggest (often 90 degrees to servo) and screw them back on. Oh, don't forget to reconnect the motor, although not with the power on, and not if you are going to bench test the setup.

You shouldn't need to send it back to the shop to get that done, but perhaps get someone that knows to check the heli over after you've done that.

Also remember to bench test thoroughly - make sure it's perfect before you try to fly again, or it'll cost you. . .

Hope some of that helps. . .

It's a bit generic, but it might help.

[Ryoken]

cheers for the reply Matt, however to get to the little screw , you have to remove the servos, so you cant get a little screw driver in to get to them ,
and to get to the servos you have to split the main chassis apart

http://www.kdsclub.com.ar/descargas/...er1-ingles.pdf

[1chris]

yes its areasonably expensive hobby I have spent £15000 in 3 years of doing it, so your journey is only just beginning!!!

[mattscupoftea]

Hmm it looks to me like you can remove the servos from the chassis without taking it apart. Of course, the servo horns will be connected to the heli via linkages to the swash, but if you pop the linkages off the ball-links on the swash, you may be able to extract the servos. Oh and you will have to remove the anti rotation bracket to free up the rearmost, elevator 'ball link' (the one where the ball is set halfway along a bar) and slide the linkage off that part to free the servo.

Just ensure that you know which way up the servos go in the model, so that you can set the horns in place when the servo's out of the 'chassis' then reinsert.

Alternatively, if you had asked someone in a shop to sort the heli out for you, and paid them money to do it, perhaps you should take it back in to them, mentioning the problem that you have observed, and see if they have an answer for you? It seems odd that they wouldn't have set the servos correctly when they put it back together. . . Perhaps they didn't, and will be able to advise. . .

[Ryoken]

been , playing , ive found out if i remove the gyro from the rear of the chassis , i can get a little screwdriver into it to remove the horns
so ive done this ,,,,
killed power , (motor wire too)
removed the 3 servo horns for the swashplate
re aligned to 90 degrese with powr on.
everything ,looks ok ,
bad news
fired up the tranny , servos go out of alignment, wonder if its a tranny fault ?
or setting , its set to heli 3 (swash and 3 servos)
but at least i know how to remove the servos , and re set up