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0| lewma
rrApprentice San Diego, CA |
R90SE Vibration Problems GuysI've been battling this problem for a while now and have ran out of ideas.I had to replace the bearings in my OS91SZH because the originals rusted for some reason. During the rebuild, I also replaced the piston ring. Since I've gotten everything back together, I now have a real bad vibration issue even when the engine is just idling. During idle, I can see the boom supports moving, the horizontal stab is moving at both ends and the GY611 is also having trouble.Anyone else had this problem ? It can't be anything but the engine/clutch, right ? I've dialed in the cooling fan, it looked fine.Help!
mark |
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 BJames111
rrElite Veteran San Diego, California |
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| MrArgus
rrNovice uk |
bad vibrations can be many things
one.. which i've experienced is not having the engine lined up correctly |
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| Dino Spadaccini
rrElite Veteran USA |
motor the os sz motor is known for the vibs try and put another motor in there like a c spec or a new ys sr both of my sz are out of the helis counldnt take the vibs in the heli anymore my cspec is in one and a Ys sr in the other, what happens when your hovering are the fins vibing is the fuel tank getting bubbles in it etc the vibs at an idle are not somthing i get to worked up about but if you are flying and hear a humming sound as you pass though mid stick and it goes away then you have a bad vib from the motor, one other place to look at is the t tube make sure the ends are running true pull the boom off the the heli and the tail off to and spin the t tube and see if it move a little off center like about 1/16 ish that ok but if you see it move more than a 1/4 off center that could be a problem in the tail if you are seeing problems there shakes in the tail fins at allCapt USA Align Factory Team Align - Conquer Your heart Team Futaba |
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| Bart B
rrKey Veteran chicago illinois |
 . BTW it's the SZ motor... |
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| Dino Spadaccini
rrElite Veteran USA |
buzz when is it buzzing in a hover or on the ground like i said i dont put much weight in the buzz on the ground with the motor at and idle if you are hovering and you have a buzz then you need to look at your heli, the first poster stated he changed every thing including the bearings in the motor i would then point to the motor or fan so check the shafts etc then work toward the motor at the endCapt USA Align Factory Team Align - Conquer Your heart Team Futaba |
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| lewma
rrApprentice San Diego, CA |
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| Dino Spadaccini
rrElite Veteran USA |
header if you are using a sb 18 you have to cut the frame away some you need the space for when adjusting the motor forward or aft make sure the starter cone turns free also pull the motor and see if the fan is running true dial it to see how far its off anymore then 2 thous that no good could be the problem and is the motor new it not look at your bearingsCapt USA Align Factory Team Align - Conquer Your heart Team Futaba |
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| lewma
rrApprentice San Diego, CA |
Dino You're right, I'm using the SB-18 muffler. I'll remove some frame to get the clearance. I already dialed in the fan and it was around 2 thousandths. I've never had vibration like this before, even on my gassers! |
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| Dino Spadaccini
rrElite Veteran USA |
more well let look at what is moving at idle the fan clutch and the start shaft what about the run out on the crank start there you might be sending a vib in the frame set from the muffler header rubbingCapt USA Align Factory Team Align - Conquer Your heart Team Futaba |
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| lewma
rrApprentice San Diego, CA |
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| MrArgus
rrNovice uk |
One more thing Another thing that happened me when i built a new 90 was that i used a second hand main spur grear from an old crashed 90. (91T does not come with new kits)This old gear coupled with the new pinion caused noise/vibrations.The problem was not that the gear was damaged in the crash but that the mesh was never correct and it had worn away a bit from one side of each tooth.replaced the main spur gear and shoved the pinion up against the main gear and have never had this problem again (btw i used to put a piece of paper between the gears when meshing... not any more!)my 2c, works for me. |
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| Dino Spadaccini
rrElite Veteran USA |
good wow never thought about the main gear thats a good one thanks MrArgusCapt USA Align Factory Team Align - Conquer Your heart Team Futaba |
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| lewma
rrApprentice San Diego, CA |
main gear that's good to know however I doubt that's contributing to my problem as the gear is not even moving as the clutch has not engaged. |
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| arceye
rrVeteran UK |
By tiny I realy mean tiny, I had a similar problem with vibes in my 90 where the tail servo was very gittery upon spool up and it was so scary I never lifted the heli off the ground. In the end it was tracked down to the tail output shaft being bent. I must say again the bend was tiny like not even noticable when the shaft was spun in a lathe but it was enough to cause the bolt that holds the tail control rod pivot bolt to snap with hi frequency vibration. The biggest sign I got was the tail control rod was vibrating badly and the tail servo was gittery during spool up ( the servo was only gittering because the bend in the shaft was causing the push rod to move forward and back very fast so the servo was trying to re-center itself. ( it looked like the gyro was having a fit )Hope this helpsAndy Kasama Head :( The Blingiest DOWNGRADE a Raptor can have |
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| lewma
rrApprentice San Diego, CA |
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| Dino Spadaccini
rrElite Veteran USA |
try this i went back and read your first post again if you can try this see if some has a R90 at your field with a differant motor other than a OS sz and try that the sz motors have a vib in them no matter what you do , i have gone back to the c spec in one its smooth as glass now and the other has a YS SR which is super smooth too just my thoughtsCapt USA Align Factory Team Align - Conquer Your heart Team Futaba |
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| Dalieo
rrApprentice SW FL |
2. I greased the bearings in the head with the greaser. 3.I changed the t/r drive shaft and went back to just one bearing support - keep in mind its still a short boom, I also greased this bearing. 4. I went to a metal fan, 1 magnet timed with piston TDC. I did try drilling into a vane but missed a hair and went all the way through the fan. 
5. I also noted that the holes in the aluminum horizontal fin bracket were drilled at an angle so when tightened it wanted to have a cant leaning about 30 degress left. So I dremmeled some material off the ends of the boom supports so when tightened the cant was gone. I dont like having to twist/pressure something then lock it into place... it should fall in by itself.My head speeds are 1770 1900 and 2000. Its a pretty smooth heli now.Hope that helps..Dale |
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| lewma
rrApprentice San Diego, CA |
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 FenderBean
rrElite Veteran Huntsville Alabama |
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