Does anybody want to guess what's wrong?

[supertoyz]

I built a new Velocity 50 N2 with OS 55 a few months ago. I've flown about 2 gallons through it breaking it in and getting it tuned. I haven't flown it in about a month since I was waiting for a new Revglo and Arizona Regulator to replace the Align 2 in 1 unit. I got the new components installed yesterday and went to try it out today. It cranked over for a few seconds and then the head caugt and twisted out of my grip. For some reason the clutch is locked up tight turning the correct direction but I can easilly turn the clutch bell by itself if I go backwards. Any idea's what I'm going to find when I open it up?

[forvols]

The crankshaft nut is loose.

[Kneedragger75]

We can guess for days but in a situation like this you will have to disassemble the
heli and find what went wrong. Often times when one part fails or comes loose it
takes others with it.

[755 robert]

I would say the clutch has come loose from the main crank shaft.Turn it one way and it loosens out and binds..Good luck let us know what you find..

[john.hopkins]

EDIT... I re read post.. Wrong solution suggestion.. Sorry.

[supertoyz]

Well it's apart, still not sure what's wrong, looks like possibly a bearing failure. I took the engine out and everything was tight and looked good. The clutch bell was still installed and when I turned the starter shaft the clutch would turn which then would turn the head. I dropped the clutch bell and the starter shaft was locked inside the bell. The shaft runs through bearings in the upper bearing block and clutch bell into a one way bearing inside the clutch shoe. It should turn freely everywhere except the clutch shoe. I got it out with a few taps on a center punch, the bearings turn freely and the shaft looks ok. I reinstalled the shaft back through the bell and bearing block, there was some resistance but it went in ok. It now turns but does have some drag. I'm not sure what happened or why so I ordered all new parts, hopefully that solves the problem

[bad007]

Oneway locked on the starter shaft, S#%t happens

[supertoyz]

No that wasn't it....one way and starter shaft are fine. It's the regular bearings the shaft passes through on it's way to the one way bearing. For some reason it was seized tight inside one of the four bearings it passed through. I pressed it out and pushed it back in. It turns but not as smooth as it should. I think it's the bearing inside the clutch bell.

[gfcused]

I had this happen for me twice on my N2.. What happens is that for some reason the starter shaft get stuck in the clutchbell/pinion.. This happen to my friend as well, and he ripped the maingear trying to start his heli..

Seems best solution is to go for MIkeKimC's mod with Align startershaft and ABEC OWB
https://www.helifreak.com/showthread.php?t=398937

[Jotto]

This is a common problem on the Velocity, caused by poor production tolerance. The starter shaft gets stuck inside the pinion.

What I did was to attach the shaft to a drill and sand it down a bit. Upgrading to an Align shaft is probably a better solution in the long run, but I didn't have the patience to order new parts.