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wichmanj · 09-14-2008, 11:02 PM

I recently had to rebuild my R90 Se. I had replace the tail rear gears. flew a couple times and now the gears seam to click or catch. i opened case to see if gears are stripped again. look good. I dont see anyway to adjust any help???

JimLerch · 09-15-2008, 12:52 AM

The new gear kit should have come with shims. If the gears are loose, put a shim between the tail rotor output shaft gear and the tail housing. Of course, I've never needed the shims, as everything was tight already. YMMV

OH, and did you check the forward bevel gears?

Also, did you put a brass ring (or heat shrink) on the gears to prevent the pin from being
thrown during flight? See image below.

http://lerch.no-ip.com/Heli/Raptor_T...d/DSC01643.JPG

Also, since we are on the topic of tails, did you upgrade to the stainless steel tail rotor hub with integrated male threads? PV0499 You REALLY need to if you have not! The Aluminum hub is prone to throwing blades, even if carefully assembled!

wichmanj · 09-15-2008, 10:46 AM

I didnt upgrade the tail i will order that part today. I also didnt heat shrink the pin. I will take a closer look at the forward gears. and let you know

thanks

wichmanj · 09-15-2008, 09:17 PM

do you glue the brass rings on? where do you get them? what size?

JimLerch · 09-16-2008, 10:28 AM

The brass rings are fabricated from hardware store thin wall 1/2 brass tube (Ace Hardware, over in the metal section, NOT plumbing pipe!!)

Cut to length with tubing cutter, then "sized" with a 10mm main shaft and a hammer. The pipe cutter rolls the ends in a little, the main shaft becomes an anvil and the hammering straightens out the rounded cut end. Also, the fit is just a friction fit, so you need to hammer it out for a perfect fit (easier to do, than to say) (A little CA or Epoxy won't hurt, but isn't neccisiary as once assembled the pins can't go anywhere)

PLEASE, do something about the pins. They will depart the airframe in flight if YOU don't do something about it! I also have a pretty good Idea what your thinking as you read this. "I assembled it properly, per the manual, and used loctite, they are fine" Sadly, you will find out that you are wrong (just like I did) it is only a matter of time until the pin comes loose and you experience the fun of "LTE" Loss of Tail Rotor Effectivness.

wichmanj · 09-16-2008, 12:21 PM

i ordered the pv0499 today. I will stop and get some tubing and get that done. Do you do this on the front and rear gears?

JimLerch · 09-17-2008, 09:53 PM

Yup, you need three rings,

one ring for the tail housing bevel gear
two rings for the front boom housing. (one ring on the bevel gear, the other on the straight gear)

nellie7532 · 09-25-2008, 07:56 AM

I have now rectified this little issue.
I removed the 3 pins, applied loctite & replaced them, unfortunately I can't get to anywhere that sells the pipe, soooooo I hunted round the house and found some permanent markers.....(see where i'm going yet?), I removed the top off 1 & it was a perfect interference fit, so I cut it to size & glued it in place then used a stanley knife to apply a shamfer for a nice fit. This should work well as I presume if the pin does move it will not have enough inertia to punch through the plastic top. Lovely jubley
Thanks for the heads up on this.
While we're here can any1 tell me how far in the torque tube should go into the ends? mine only seem to go in about 8mm, is this ok?

09-14-2008, 11:02 PM	#1 (permalink)
wichmanj Join Date: Jan 2008	r90 tail trouble I recently had to rebuild my R90 Se. I had replace the tail rear gears. flew a couple times and now the gears seam to click or catch. i opened case to see if gears are stripped again. look good. I dont see anyway to adjust any help???

09-15-2008, 12:52 AM	#2 (permalink)
JimLerch Registered Users My HF Map location Join Date: Nov 2007	The new gear kit should have come with shims. If the gears are loose, put a shim between the tail rotor output shaft gear and the tail housing. Of course, I've never needed the shims, as everything was tight already. YMMV OH, and did you check the forward bevel gears? Also, did you put a brass ring (or heat shrink) on the gears to prevent the pin from being thrown during flight? See image below. http://lerch.no-ip.com/Heli/Raptor_T...d/DSC01643.JPG Also, since we are on the topic of tails, did you upgrade to the stainless steel tail rotor hub with integrated male threads? PV0499 You REALLY need to if you have not! The Aluminum hub is prone to throwing blades, even if carefully assembled! __________________ James Lerch - Raptor 90, JR Vibe 500E, Gaui 550E, Xcell Razor* (*=On Loan) http://lerch.no-ip.com/atm (My homebuilt telescope site) http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project) http://www.youtube.com/profile?user=JlerchTampa (my you-tube crash videos) http://lerch.no-ip.com/Hat_Cam ("Hat Cam" for recording flights)

09-16-2008, 10:28 AM	#5 (permalink)
JimLerch Registered Users My HF Map location Join Date: Nov 2007	The brass rings are fabricated from hardware store thin wall 1/2 brass tube (Ace Hardware, over in the metal section, NOT plumbing pipe!!) Cut to length with tubing cutter, then "sized" with a 10mm main shaft and a hammer. The pipe cutter rolls the ends in a little, the main shaft becomes an anvil and the hammering straightens out the rounded cut end. Also, the fit is just a friction fit, so you need to hammer it out for a perfect fit (easier to do, than to say) (A little CA or Epoxy won't hurt, but isn't neccisiary as once assembled the pins can't go anywhere) PLEASE, do something about the pins. They will depart the airframe in flight if YOU don't do something about it! I also have a pretty good Idea what your thinking as you read this. "I assembled it properly, per the manual, and used loctite, they are fine" Sadly, you will find out that you are wrong (just like I did) it is only a matter of time until the pin comes loose and you experience the fun of "LTE" Loss of Tail Rotor Effectivness. __________________ James Lerch - Raptor 90, JR Vibe 500E, Gaui 550E, Xcell Razor* (*=On Loan) http://lerch.no-ip.com/atm (My homebuilt telescope site) http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project) http://www.youtube.com/profile?user=JlerchTampa (my you-tube crash videos) http://lerch.no-ip.com/Hat_Cam ("Hat Cam" for recording flights)

09-17-2008, 09:53 PM	#7 (permalink)
JimLerch Registered Users My HF Map location Join Date: Nov 2007	Yup, you need three rings, one ring for the tail housing bevel gear two rings for the front boom housing. (one ring on the bevel gear, the other on the straight gear) __________________ James Lerch - Raptor 90, JR Vibe 500E, Gaui 550E, Xcell Razor* (*=On Loan) http://lerch.no-ip.com/atm (My homebuilt telescope site) http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project) http://www.youtube.com/profile?user=JlerchTampa (my you-tube crash videos) http://lerch.no-ip.com/Hat_Cam ("Hat Cam" for recording flights)

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09-15-2008, 10:46 AM	#3 (permalink)
wichmanj Thread Starter Join Date: Jan 2008	I didnt upgrade the tail i will order that part today. I also didnt heat shrink the pin. I will take a closer look at the forward gears. and let you know thanks

09-15-2008, 09:17 PM	#4 (permalink)
wichmanj Thread Starter Join Date: Jan 2008	do you glue the brass rings on? where do you get them? what size?

09-16-2008, 12:21 PM	#6 (permalink)
wichmanj Thread Starter Join Date: Jan 2008	i ordered the pv0499 today. I will stop and get some tubing and get that done. Do you do this on the front and rear gears?

09-25-2008, 07:56 AM	#8 (permalink)
nellie7532 Join Date: Sep 2006	I have now rectified this little issue. I removed the 3 pins, applied loctite & replaced them, unfortunately I can't get to anywhere that sells the pipe, soooooo I hunted round the house and found some permanent markers.....(see where i'm going yet?), I removed the top off 1 & it was a perfect interference fit, so I cut it to size & glued it in place then used a stanley knife to apply a shamfer for a nice fit. This should work well as I presume if the pin does move it will not have enough inertia to punch through the plastic top. Lovely jubley Thanks for the heads up on this. While we're here can any1 tell me how far in the torque tube should go into the ends? mine only seem to go in about 8mm, is this ok?

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