blue gears on G4?

[cudaboy_71]

hey all,

i'm building one of hotheli's SEV2/G4 combos and i'm having trouble with the belt drive gear mesh.

i know the G4 was originally designed for use with the white gears (right?) does anyone know of any issues with using the blue gears?

issues:

#1 with the G4 main shaft bushing installed, there is still about 1/4" play between the larger main motor gear and the lower rear gear. it's not sloppy loose; but, i can use a finger on each side of the gear and easily move it up and down on the one-way bearing shaft. this might not be a big issue except.....

#2 there is considerable grinding between the lower blue gear and the blue gear of the tail drive gear assembly. i've studied it from all angles and it doesnt appear that anything is rubbing. but, it grinds considerably less when the upper main gear is in its upper-most position rather than seated completely on the one-way bearing shaft (as i described in point #1)

so, back to the main question: are there any known issues related to the use of the blue reduction gear sets?

[WillJames]

I have #2 pretty bad on my G4. After 3 flights it touches the counter gear shaft about 1/4 of the way around. Looks like to me the main gear is pretty badly out of round.

[Rotorworkz]

I believe Henry is using the Blue gears I have not tried anything else as I have a stock pile of white standard gears

[WillJames]

HC is running the White main gear and the blue tail drivegear.

[Rotorworkz]

[quote="cudaboy_71"]

#1 with the G4 main shaft bushing installed, there is still about 1/4" play between the larger main motor gear and the lower rear gear. it's not sloppy loose; but, i can use a finger on each side of the gear and easily move it up and down on the one-way bearing shaft. this might not be a big issue except.....[qoute]

Is there physical changes to the gear dimension other than dia. like height?

[quote="cudaboy_71"]
#2 there is considerable grinding between the lower blue gear and the blue gear of the tail drive gear assembly. i've studied it from all angles and it doesnt appear that anything is rubbing. but, it grinds considerably less when the upper main gear is in its upper-most position rather than seated completely on the one-way bearing shaft (as i described in point [quote]


make sure the oneway is flush with the top of the gears "oneway bore"

[philipfrank]

i got out today and burned down two packs doing my standard flip flop pirouette routine for the first time since building up the G4 frames and getting my bugs worked out.

it went very well. all of my drive gears are white. do i need to consider the blue tail reduction gears?

i'm running a 430L 3550. i have no clue what my head speed is but in v-curve my throttle runs between 80 and 100. (8103)

i've had to pull out a little pitch to keep it from bogging. i'm still running plastic head parts and a modified swashplate but it flys pretty good but could use more punch. more than i can outfly at the moment otherwise.

[cudaboy_71]

Is there physical changes to the gear dimension other than dia. like height?

not sure. kit didnt come with the white gears to measure. i can probably find some somewhere to measure. but, that's kinda what i was hoping one of you all could tell me.

BTW, upon looking closer i see that there is some flashing on the bottom of the large gear that is rubbing on the tail drive gear assembly. i think this is the source of the 'grinding'. i'm going to disassemble and shave the flashing and see if things are smoother.

i loctited the jesus bolt in though...looks like some fun to be had breaking that loose without spinning the nut in the plastic nut stay.

[cudaboy_71]

i tore into it. i think i've found the source of my gear slop. what do you guys make of these pix:

http://www.easilyfreaked.com/misc/heli/trex/bluegears/thumbs/IMGP4719.jpg
click for large pic (http://www.easilyfreaked.com/misc/heli/trex/bluegears/IMGP4719.jpg)

this just showing my oneway is flush with the top of the gear.

http://www.easilyfreaked.com/misc/heli/trex/bluegears/thumbs/IMGP4720.jpg
click for large pic (http://www.easilyfreaked.com/misc/heli/trex/bluegears/IMGP4720.jpg)

the one way shaft installed

http://www.easilyfreaked.com/misc/heli/trex/bluegears/thumbs/IMGP4721.jpg
click for large pic (http://www.easilyfreaked.com/misc/heli/trex/bluegears/IMGP4721.jpg)

fully assembled, the upper gear still shows about 3/16" of shaft through the top of the assembly. when following the G4 instructions, I placed the included aluminum spacer on the shaft above the gear assembly. now the large blue gear has this 3/16" it can slide up and down the one way bearing shaft until it hits the spacer.

anyone else's installation look like this?

[cudaboy_71]

i love talking to myself :D

anyway, it appears the G4 instructions neglect to tell you to replace the stock spacer above the gear.

Install Main shaft assembly when shaft passes through bottom bearing install Aluminum gear spacer as shown in top right.

Install Main drive gear and securing screw onto main shaft and secure in place with Jesus bolt.

i feel dumb :o i guess that would be common sense for veteran trex builders. this is my first and it has never been assembled as a stock SE. i'm going from box to G4.

it still grinds a little. but, the slop is gone. i guess the rub will wear in.

thanks for all the replies.

[Rotorworkz]

i love talking to myself :D

anyway, it appears the G4 instructions neglect to tell you to replace the stock spacer above the gear.

Install Main shaft assembly when shaft passes through bottom bearing install Aluminum gear spacer as shown in top right.

Install Main drive gear and securing screw onto main shaft and secure in place with Jesus bolt.

i feel dumb :o i guess that would be common sense for veteran trex builders. this is my first and it has never been assembled as a stock SE. i'm going from box to G4.

it still grinds a little. but, the slop is gone. i guess the rub will wear in.

thanks for all the replies.



Its ok to talk to yourself as long as you don't reply......... in public :wink: :lol:
As for the spacer I will add it to the instructions thanks for pointing it out.

Take a side view pictures of your heli and post it so I/we can maybe solve the rubbing

[cudaboy_71]

http://www.easilyfreaked.com/misc/heli/trex/bluegears/thumbs/IMGP4723.jpg
click for large pic (http://www.easilyfreaked.com/misc/heli/trex/bluegears/IMGP4723.jpg)

here's the side view. the tail drive gear assembly shaft looks slightly tweaked...or the gear on the shaft does. the gears also do not mesh perfectly top to bottom. i did take an exacto and shave the upper gear to eliminate a slight rub. the grinding is no longer present. but, i'm still curious about the alignment of the gears. but, i see nowhere to adjust either.

of note: all the blue gears were NIP. that is, these were not removed from the SE frame. these came in new header card bags with the appropriate hardware also included. so, i know i didnt bend the shaft or damage the gears in disassembly. this is how the G4/SE combo is shipped.

[Rotorworkz]

here's the side view. the tail drive gear assembly shaft looks slightly tweaked...or the gear on the shaft does. the gears also do not mesh perfectly top to bottom. i did take an exacto and shave the upper gear to eliminate a slight rub. the grinding is no longer present. but, i'm still curious about the alignment of the gears. but, i see nowhere to adjust either.

of note: all the blue gears were NIP. that is, these were not removed from the SE frame. these came in new header card bags with the appropriate hardware also included. so, i know i didnt bend the shaft or damage the gears in disassembly. this is how the G4/SE combo is shipped.

It may be the angle of the picture but it looks like the main gear is setting a little low, not sure if it is enough to cause that kind of rubbing but being I am un familar with the blue gears you may have to press the one way in a little farther in order to allow more clearance hmmm.... also the TR pulley "gear" seems taller sorry I can't answer these direct as I don't own any of the blue gears. I may just have to order a set to look at or if someone reading this if You are running these gears could you let us know if you see something.

Charley

[kookboy]

I ran the blue gears without any problems in my G4. Had to align the bearing/spacer a little but it worked great.

[cudaboy_71]

Had to align the bearing/spacer a little but it worked great.

thanks kook. what does that mean exactly? did you have to put the oneway further down or up in the main gear? and, what did you do to get the lower rear drive gear meshing with the tail drive gear assembly?

[TerryBelanger]

I'll shed some light on this when my frameset comes in!!

[bowman]

cudaboy!
I was Thinking, maybe the blue gears don't fit on the G4 which would have been a bummer.
but if you look at kookboys G4 set up on the show "you'r G4trex Thread"

he's gears line up perfect. dunno if you've seen that allready :dontknow

Maybe something to do with the gears, sleeve. :roll:

[andrewt1971]

Hi Cudaboy,
I had the same problem assembling my G4 frame with the Align blue gears, I ended up turning a new main shaft spacer that was 1/16" shorter than the Rotorworkz one that was supplied. I know this doesn't help you but at least you know your not alone!!

[WillJames]

I used the stock spacer that comes with the kit. It took me a while to get the auto bearing right to make it all line up perfectly but thanks to the killer auto bearing tool, I'm good to go.

Should have my 3400 today. :)

[cudaboy_71]

is this the auto bearing tool you are talking about?

http://j.b5z.net/i/u/2041425/i/zzzzzzzzzzzk10273a.jpg

i dont have one...yet. wanna make sure i get the right tool.

[philipfrank]

it looks like the blue gear below the belt pulley is too high. it looks like it needs to be pressed down just a bit on the shaft.

[cudaboy_71]

thanks phillip i'll look into that

[WillJames]

No Cuda, I am using hte Rotorworkz one, it is a lot easier to use and you only need both hands to do it. Very easy to fine tune the auto bearing plaement with.

Here is the link to the tool.

http://www.helifreak.com/about11123.html

Will

[cudaboy_71]

and you only need both hands to do it

HA! thanks for the link.

[SteveL]

Sorry for the late reply...computer took a lightning strike.
Blue gears are the same as white near as I can tell. Here is the problem: No 2 gears align makes are the same You may have to slightly adjust the position of the one way.
I have been running the blue ones for a while (hoped they were straighter but no Joy)

[thomasm]

Will both the Align HS1152 (for X / XL) and HS1153 /for SE / XL) fit on the G4?
I broke some teeth on my main gear, and need a replacement....so why not upgrade?