600N making hight pitch squeal as it starts to take off

[jessdigs]

My 600N idles fine, but when I go to take off it makes a squeal. Started after it was introduced to a pine tree in the park. I replaced the usual main gear, auto gear, main shaft, feathering shaft, tail boom, tail unit (belt drive), bearings on the main shaft, main blades, tail blades.
I feel like I am chasing a ghost. Before I tear it down and start digging in, investigating and replacing everything, I figured I would check in here, and see if the brilliant mins at h.f. have heard of this.
Could it be the bearings in the y.s. .50? Could my swash have taken too hard of a hit and it is bad? Could it be my clutch? Any info appreciated. Thanks. -Jesse

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[ticedoff8]

Check the starter shaft and starter shaft bearings.

[jessdigs]

Ok, I didn't think of that. I will give it a shot. Thanks

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[Drivelayer]

I had a similar issue on an electric 550. Turned out to be the swash, which seemed to turn freely but when I pulled it off heli and worked it by hand I found two things
1) swash spun free with no drag but sounded like it had no oil. A new swish actually has a little bit of resistance from the lube.
2) when turned slowly I could feel one spot that had a minor catch, it was hard to feel.

[cmouton]

Sounds like a slipping clutch. If not, the oneway in the maingear that slips, but I will put my money on the clutch...

[bullitt]

I bought a used 600n with a ys 56 and had a squeel appear after 3 or 4 flights.Also noticed the sequel was the loudest when flying away. I inspected all the clutch related bearings which appeared fine.It turned out to be the engine main bearings.
The squealing was loudest when the exhaust stinger was facing me while flying,which is actually a very good indication as the squealing makes its way through the exhaust pipe outlet.
good luck

[jessdigs]

I was worried that might be it. I have not had a chance to tear into it yet, I have been flying my electrics. I am just going to have to tear it apart and check all of the points mentioned. Someone at the fun fly yesterday mentioned it might be the fan rubbing on the shroud, but it sounds more of a metallic squeal

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[bullitt]

please give an update when you are able to change your bearings.

[jessdigs]

I will. I have been focusing on my long term 700N build. I have been working on it since valentine's day. I bought an airframe and started buying parts. I just finished it this weekend, so I will be back to working on the 600N. I did buy a new swash just to try that also. I will post back when it is completed

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