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OriginalGum · 02-03-2012, 07:02 PM

Hello, all... I appreciate your help. After buzzing through a Double Horse and a Volitation, I decided to purchase a better quality heli... therefore I bought a Walkera UFLY, and I love it. HOWEVER... the gears that contact the main fly gear strip unbelievably so! After replacement of the front gear yesterday, I took it out to fly today and stripped the drive shaft itself. I have parts on order, but was wondering if any one here could give instruction on how to replace the Tail Driven Shaft (HM-UFLY-Z-11)? Also, are there any specs that I need to work within when replacing? I think part of my problem was that when I replaced the bevel gear to drive the tail rotors yesterday, I must have pushed the boom and assembly to far forward, thereby creating to much friction upon the shaft...

Regardless, I appreciate your insight... I am a newbie, and I am an easily confused newbie at that! Please take that into consideration... Thanks!

MasterOnion · 02-07-2012, 10:29 PM

I have the same predicament on my Uflys after running the tail rotor up against concrete - sheared the tail gear right off at the main gear. Hopefully there's an answer somewhere on this forum.

MasterOnion · 02-07-2012, 10:44 PM

See post #5 here
https://www.helifreak.com/showthread.php?t=328961

OriginalGum · 02-09-2012, 09:34 AM

Hello, MasterOnion... I appreciate your reply and the information that you found for me...! However, I was able to replace that shaft and, I can't believe it, everything STILL works! I was making it much harder than what it needed to be. In fact, I disassembled the entire tail rotor assembly, thinking this was a necessity... it wasn't. I removed the entire boom and with a pair of needle nose pliers removed the shaft. The ends of the new shaft were keyed for the gears, so I just made sure that the keyed ends were flush inside the slots of the gears by tapping the opposite end of the shaft against the table I was working on, replaced the steering gear with a new one that meshes with the main fly gear, put everything back together and now it works fine. I did have to do some tweeking with the tail rotor assembly (having disassembled it) but, wow... after a couple of hours, its all done and flies great. I appreciate your help. I hope your week is shaping up well, and happy flying! Mike

MasterOnion · 02-20-2012, 12:58 PM

I was out of town for a week and had to order parts from HeliDirect, but I too ended up taking apart the entire tail. After a week, I worked on it again and managed to find a place for all of the parts

. My carbon fiber shaft had sheared off at the tail gear that is driven off the main gear. So, I replaced that plastic gear, carbon rod (very hard to get the bearings off, yet they slide right on the new shaft), my slightly bent tail boom, and also discovered I had broken the plastic pieces holding on the horizontal and vertical fins (nothing some CA can't fix). I was going to a club indoor flying session, but test flew it and found that I no longer have enough tail rotor torque to avoid spinning. Maybe it's the heavier Harken blades I put on the mains, but I think maybe I didn't get the tail rotor shaft properly engaged to its gear that meshes with the rear gear on the carbon tail torque tube (I'm making up names for things here; I'm a noob). There seems to be a small little metal pin in the metal shaft to the tail rotor - maybe that was supposed to be inside between the rear bearings and engaged in the plastic gear that supplies power to the tail? Either the tail is slipping (because that pin is not engaged?) or my increased blade weight has increased the main rotor torque.

02-03-2012, 07:02 PM	#1 (permalink)
OriginalGum Registered Users Join Date: Feb 2012	Walkera Tail Shaft replace Hello, all... I appreciate your help. After buzzing through a Double Horse and a Volitation, I decided to purchase a better quality heli... therefore I bought a Walkera UFLY, and I love it. HOWEVER... the gears that contact the main fly gear strip unbelievably so! After replacement of the front gear yesterday, I took it out to fly today and stripped the drive shaft itself. I have parts on order, but was wondering if any one here could give instruction on how to replace the Tail Driven Shaft (HM-UFLY-Z-11)? Also, are there any specs that I need to work within when replacing? I think part of my problem was that when I replaced the bevel gear to drive the tail rotors yesterday, I must have pushed the boom and assembly to far forward, thereby creating to much friction upon the shaft... Regardless, I appreciate your insight... I am a newbie, and I am an easily confused newbie at that! Please take that into consideration... Thanks!

02-09-2012, 09:34 AM	#4 (permalink)
OriginalGum Registered Users Thread Starter Join Date: Feb 2012	Hey I DID it! Hello, MasterOnion... I appreciate your reply and the information that you found for me...! However, I was able to replace that shaft and, I can't believe it, everything STILL works! I was making it much harder than what it needed to be. In fact, I disassembled the entire tail rotor assembly, thinking this was a necessity... it wasn't. I removed the entire boom and with a pair of needle nose pliers removed the shaft. The ends of the new shaft were keyed for the gears, so I just made sure that the keyed ends were flush inside the slots of the gears by tapping the opposite end of the shaft against the table I was working on, replaced the steering gear with a new one that meshes with the main fly gear, put everything back together and now it works fine. I did have to do some tweeking with the tail rotor assembly (having disassembled it) but, wow... after a couple of hours, its all done and flies great. I appreciate your help. I hope your week is shaping up well, and happy flying! Mike

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02-07-2012, 10:29 PM	#2 (permalink)
MasterOnion Registered Users Join Date: Jan 2012	I have the same predicament on my Uflys after running the tail rotor up against concrete - sheared the tail gear right off at the main gear. Hopefully there's an answer somewhere on this forum.

02-07-2012, 10:44 PM	#3 (permalink)
MasterOnion Registered Users Join Date: Jan 2012	See post #5 here https://www.helifreak.com/showthread.php?t=328961

02-20-2012, 12:58 PM	#5 (permalink)
MasterOnion Registered Users Join Date: Jan 2012	I was out of town for a week and had to order parts from HeliDirect, but I too ended up taking apart the entire tail. After a week, I worked on it again and managed to find a place for all of the parts . My carbon fiber shaft had sheared off at the tail gear that is driven off the main gear. So, I replaced that plastic gear, carbon rod (very hard to get the bearings off, yet they slide right on the new shaft), my slightly bent tail boom, and also discovered I had broken the plastic pieces holding on the horizontal and vertical fins (nothing some CA can't fix). I was going to a club indoor flying session, but test flew it and found that I no longer have enough tail rotor torque to avoid spinning. Maybe it's the heavier Harken blades I put on the mains, but I think maybe I didn't get the tail rotor shaft properly engaged to its gear that meshes with the rear gear on the carbon tail torque tube (I'm making up names for things here; I'm a noob). There seems to be a small little metal pin in the metal shaft to the tail rotor - maybe that was supposed to be inside between the rear bearings and engaged in the plastic gear that supplies power to the tail? Either the tail is slipping (because that pin is not engaged?) or my increased blade weight has increased the main rotor torque.

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