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GSPI · 10-27-2013, 09:41 PM

Quote:

Originally Posted by 52Heli

Shaft broke 6" off ground today exact same spot with Lynx frame stiffener.
Looks like i need the Lynx owb as well. The break damaged the bearing
above the pulley as well. Luckly on a shaft, stripped main gear and bearing.

Hold on. You are saying that you had a failure with the brace in place? Please, please document this with photos if you wouldn't mind. I want to see the failure if you could show it to me. PM them or put them out here on the board so everyone can see. I need to see the airframe and the broken shaft if you could. I'm interested in what caused this one with the brace in place. How long have you had the brace in place? Have you had any other failures or crashes with this heli before this shaft failed? Just some questions of interest.

Thanks in advance.

mallstott · 10-27-2013, 09:57 PM

Yes, more info please! This is the first I've heard of a break with the lynx stiffener in place. I thought it was a complete fix. I do have the owb as well, but my understanding was this was a flex issue, so the bearing shouldn't matter.

Mike

Sent from my Xoom using Tapatalk 4

nartac · 10-27-2013, 10:13 PM

Quote:

Originally Posted by mallstott

Yes, more info please! This is the first I've heard of a break with the lynx stiffener in place. I thought it was a complete fix. I do have the owb as well, but my understanding was this was a flex issue, so the bearing shouldn't matter.

Mike

Sent from my Xoom using Tapatalk 4

the bearing does matter. Well, at least part of the OWB anyway. Since the part of the shaft where the Jesus bolt goes through, there is not much of steel left on that site. With the OWB, it does have a metal sheath that strengthens this area along with the OWB riding on it as well as the aluminum tail gear.

I would say along with frame stiffener, it's double protection.

GSPI · 10-27-2013, 10:53 PM

Quote:

Originally Posted by nartac

the bearing does matter. Well, at least part of the OWB anyway. Since the part of the shaft where the Jesus bolt goes through, there is not much of steel left on that site. With the OWB, it does have a metal sheath that strengthens this area along with the OWB riding on it as well as the aluminum tail gear.

I would say along with frame stiffener, it's double protection.

Exactly to what I'm trying to understand what happened. If the failure is a shearing rather than a fatigue fracture then it could be a problem with the Jesus bolt shearing the main shaft from looseness in it's mounting. The OWB helps to reduce that force on that Jesus bolt.

Txseaaggie · 10-27-2013, 11:14 PM

Quote:

Originally Posted by nartac

Since the part of the shaft where the Jesus bolt goes through, there is not much of steel left on that site.

Crazy idea. With the OWB that doesn't use the lower jesus bolt has anyone ever tried to fill in the hole with some JB Weld or something?

Sent from my DROID RAZR using Tapatalk

helibus · 10-28-2013, 07:33 AM

Quote:

Originally Posted by surfshopguy07

Crazy idea. With the OWB that doesn't use the lower jesus bolt has anyone ever tried to fill in the hole with some JB Weld or something?

The OWB still gets bolted onto the mainshaft.

Txseaaggie · 10-28-2013, 10:17 AM

Quote:

Originally Posted by helibus

The OWB still gets bolted onto the mainshaft.

Oh I thought it just gets clamped on. Misunderstood that

52Heli · 10-28-2013, 05:32 PM

Camera battery is dead at the moment will post tonight. The brace was put
on before the first flight. Purchased new no crash's prior to the snap. I was under the impression that the stiffner fixed the problem as well until yesterday. Have two of these things and both are grounded till the other upgrade can be ordered and installed.
Almost bought align wishing now I would have.

terryv83 · 10-28-2013, 05:45 PM

If you're talking about the 250 dfc, I've heard they're worse then the 300x with problems. Imho the main shaft problem is a known one, so if you're thinking of buying an align , please do that and spare us who have imbraced the issues and are trying to rectify them instead of slaging off the product

52Heli · 10-28-2013, 06:49 PM

Yes your right the broken main shafts are known that's why I add the Lynx
frame stiffner. However, as others an myself are unaware that will not
keep the main shaft from snapping. I hope my post helps others so
they install what needs to be on the heli to prevent costly damages and
any accidents from happening.

As far as align don't think I have heard about any main shafts snapping
but tail wag yes. Big difference.

terryv83 · 10-28-2013, 07:37 PM

Please don't take what I wrote as a personal attack on you, wasn't meant to be. I think the main frame sucks on this heli as well, I post a pic later of how I braced it, I never got the lynx brace, and I'm not snapping shafts anymore. I'm not saying my method is perfect but it seems to work. Like you say every person new to this heli we can help prevent having the problem the better. I think lynx is making a complete carbon fiber frame for this heli, this should fix the problem. Too bad Blade hasn't found a fix or if they have they aren't sharing it.

52Heli · 10-28-2013, 08:13 PM

Pic's

mallstott · 10-28-2013, 09:05 PM

What blades were you spinning? I don't think it matters, but just curious. Were you in idle up? Any idea on the head speed?

Also can you take another pic showing the other side of the head pieces where the break is? I don't know it it means anything but from the angle it appears the your break is to one side of the whole, where mine looked more centered. Could just be the camera angle.

thanks,
Mike

Sent from my Xoom using Tapatalk 4

GSPI · 10-28-2013, 11:08 PM

Quote:

Originally Posted by 52Heli

Pic's

Ok thanks for posting that. Slightly different failure than I've seen in the past. That very well could be the shearing from the Jesus bolt. I need to study this failure for a little.

nartac · 10-29-2013, 10:56 AM

Quote:

Originally Posted by 52Heli

Pic's

looking at this picture, I see that your bearing has fallen apart. I can only guess that there was vibration due to this failed bearing which caused stress on the shaft and thus eventual failure of the main shaft due to stress fracture.

I think in this case, frame stiffener or no, it wouldn't really prevent the shaft from breaking but with the addition of OWB, it may help a little.

I never fly with any signs of vibration. I land immediately and tear it down to inspect.

52Heli · 10-29-2013, 07:20 PM

Running lynx blades hovering not a lot of head speed. As for the break its not
100% even across. One side of the break is more even than the other. When the shaft snapped it pulled the section of the bearing off due to the break. The bearing itself
was not bad. When pressing the shaft back together it looks like the machine work is
off some but that could be due to the break. In my opinion this wouldn't happen if a decent frame was put on this heli from the get go. The frame on the 130 is stronger and stiffer. As for the pic's the shaft kept rolling around due to the collier and lock nut.

BRANDON L · 10-29-2013, 08:19 PM

The shaft snapping is the cause of all five crashes I have had with the 300x. 2 of them had the lynx fame stiffener but it was because i was running a high head speads with the wicked motor and i push this thing to it's limits. But the last crash the shaft snapped on a tic-toc and slammed down right in front of me. Scared the crap out of me. So ive been waiting for a main shaft fix to repair my 300. Lynx comes to the rescue again for the 300 fans

52Heli · 11-02-2013, 08:08 PM

Replaced shaft and installed lynx Hub on a stock gear. Had to sand the inside of
the stock gear to get the hub to sit flush. Used stock screws to mount hub to
the gear. I can see the bearing removing the added stress of the shaft especially flying
stock main gear and motor. Flys nice and smooth.

10-28-2013, 08:13 PM	#32 (permalink)
52Heli Registered Users Join Date: Apr 2012	Pic's Attached Thumbnails

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10-27-2013, 09:57 PM	#22 (permalink)
mallstott Registered Users Thread Starter Join Date: Oct 2013	Yes, more info please! This is the first I've heard of a break with the lynx stiffener in place. I thought it was a complete fix. I do have the owb as well, but my understanding was this was a flex issue, so the bearing shouldn't matter. Mike Sent from my Xoom using Tapatalk 4

10-28-2013, 05:32 PM	#28 (permalink)
52Heli Registered Users Join Date: Apr 2012	Camera battery is dead at the moment will post tonight. The brace was put on before the first flight. Purchased new no crash's prior to the snap. I was under the impression that the stiffner fixed the problem as well until yesterday. Have two of these things and both are grounded till the other upgrade can be ordered and installed. Almost bought align wishing now I would have.

10-28-2013, 05:45 PM	#29 (permalink)
terryv83 Registered Users Join Date: Jan 2009	If you're talking about the 250 dfc, I've heard they're worse then the 300x with problems. Imho the main shaft problem is a known one, so if you're thinking of buying an align , please do that and spare us who have imbraced the issues and are trying to rectify them instead of slaging off the product

10-28-2013, 06:49 PM	#30 (permalink)
52Heli Registered Users Join Date: Apr 2012	Yes your right the broken main shafts are known that's why I add the Lynx frame stiffner. However, as others an myself are unaware that will not keep the main shaft from snapping. I hope my post helps others so they install what needs to be on the heli to prevent costly damages and any accidents from happening. As far as align don't think I have heard about any main shafts snapping but tail wag yes. Big difference.

10-28-2013, 07:37 PM	#31 (permalink)
terryv83 Registered Users Join Date: Jan 2009	Please don't take what I wrote as a personal attack on you, wasn't meant to be. I think the main frame sucks on this heli as well, I post a pic later of how I braced it, I never got the lynx brace, and I'm not snapping shafts anymore. I'm not saying my method is perfect but it seems to work. Like you say every person new to this heli we can help prevent having the problem the better. I think lynx is making a complete carbon fiber frame for this heli, this should fix the problem. Too bad Blade hasn't found a fix or if they have they aren't sharing it.

10-28-2013, 09:05 PM	#33 (permalink)
mallstott Registered Users Thread Starter Join Date: Oct 2013	What blades were you spinning? I don't think it matters, but just curious. Were you in idle up? Any idea on the head speed? Also can you take another pic showing the other side of the head pieces where the break is? I don't know it it means anything but from the angle it appears the your break is to one side of the whole, where mine looked more centered. Could just be the camera angle. thanks, Mike Sent from my Xoom using Tapatalk 4

10-29-2013, 07:20 PM	#36 (permalink)
52Heli Registered Users Join Date: Apr 2012	Running lynx blades hovering not a lot of head speed. As for the break its not 100% even across. One side of the break is more even than the other. When the shaft snapped it pulled the section of the bearing off due to the break. The bearing itself was not bad. When pressing the shaft back together it looks like the machine work is off some but that could be due to the break. In my opinion this wouldn't happen if a decent frame was put on this heli from the get go. The frame on the 130 is stronger and stiffer. As for the pic's the shaft kept rolling around due to the collier and lock nut.

10-29-2013, 08:19 PM	#37 (permalink)
BRANDON L Registered Users Join Date: Jan 2013	The shaft snapping is the cause of all five crashes I have had with the 300x. 2 of them had the lynx fame stiffener but it was because i was running a high head speads with the wicked motor and i push this thing to it's limits. But the last crash the shaft snapped on a tic-toc and slammed down right in front of me. Scared the crap out of me. So ive been waiting for a main shaft fix to repair my 300. Lynx comes to the rescue again for the 300 fans

11-02-2013, 08:08 PM	#38 (permalink)
52Heli Registered Users Join Date: Apr 2012	Replaced shaft and installed lynx Hub on a stock gear. Had to sand the inside of the stock gear to get the hub to sit flush. Used stock screws to mount hub to the gear. I can see the bearing removing the added stress of the shaft especially flying stock main gear and motor. Flys nice and smooth.

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