Chasing a vibration - HeliFreak
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Titan X50 Thunder Tiger Titan X50 Helicopters


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Old 10-15-2012, 09:10 AM   #1 (permalink)
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Join Date: Jan 2007
Location: virginia
Default Chasing a vibration

I have a X-50e that has a troubling vibration problem.

I am running 12s, Castle ICE2 80HV in gov mode with 500kv motor (Scorpion) and stock 15t pinion. Using BeastX with MKS servos @ 6v through Castle pro BEC. Everything on the heli is stock with the exception of Edge 623 main blades and KBDD tail blades.

The heli spools up and hovers nicely. Transition to forward flight is good. Change head speed in ST1 and ST2 to approx 2000 to 2100 according to calculator (never actually tached) all good. The Heli will handle easy aerobatics, stall turns and Loops no problems.

Now comes the problem. From an inverted hover (still stable) I pull negative collective and push the heli away in a gentle rainbow. Just past the top of the arc, I center the collective and continue to push the cyclic to return to upright level hover. As soon as I add positive collective at the bottom of the rainbow, the heli begins to vibrate. I can hear it as soon as it starts and when I back the heli in towards myself, I can see the vibration in the tail fin and skids. The vibration will not stop in the air. I have to land and take back off to get it to stop. This is 100% repeatable, several people have flown the heli and it always happens.

I have been through the heli mechanically and nothing jumps out. No main shaft play. bearings feel good. I did add an extra torque tube bearing just to see if it made a difference. Drive gears and autorotation all feel good with no slop or play.

I am at a loss on this one. Has anybody experienced a problem like this? Suggestions?

Dennis
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Old 10-24-2012, 01:58 AM   #2 (permalink)
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if you grab the tips of the blades and lift up and push down do you have excessive slop?
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Old 10-24-2012, 09:59 AM   #3 (permalink)
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There is not any slop, or what I would call slop. The blades move up and down, but not excessively. I don't seem to have the in/out play in the grips that others have talked about with this heli.

I did try a set of Radix V2 FBL 625 blades and the problem was significantly reduced.

It's definitely something involving headspeed, dampers, blades or some combination of all of them.

Dennis
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Old 10-25-2012, 10:05 AM   #4 (permalink)
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My Nitro X50 FBL vibrates at any RPM above 1500 and just not little vibrations but huge hurt your hand when you put it on the tail boom.

Good luck. I've been trying to track mine down after 4 months and after replacing every part on the damn thing.

I'm using mine as a martini shaker.
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