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T-REX 600 › Gray TT gears weaker than white?
06-05-2009 01:14 AM  8 years agoPost 1
cudaboy_71

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sacramento, ca, u.s.

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I've had my 600E converted to TT for going on a year now, with the original white TT gears that came with the H60118.

well, two weeks ago i had my first crash with that heli and i stripped out the front TT gears.

I had a set of H60147-03 (front gear set for nitro) on the shelf already, so i replaced the gears with that.

Today, 2 minutes into the 11th or 12th flight on the gears i heard the aweful sound of gears stripping in the air. i was in the middle of a tail-standing aileron roll--i got it level, inverted before the tail completely let go and i had to hit T/H...landed the heli square on the head tearing up the main blades and little else.

question: has anyone had issue with the gray gears being softer than the white? or are the gray gears different enough to be ONLY for nitro and not the electric?

just curious if this was a fluke, as there's really no way to install the gears wrong.

if it ain't broke, break it.

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06-05-2009 01:51 AM  8 years agoPost 2
baddynergy

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sierra madre, ca- usa

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Exact same gears, just a different color. The theory behind the grey gears for nitro was it stays cleaner.

I have never stripped a gear in the 2yrs I have had my 600n

**Unattended children will be givin a shot of espresso and a puppy**

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06-05-2009 01:58 AM  8 years agoPost 3
duceduc

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Saitama-Ken, Japan

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Me neither. I only changed out the grears to find a vibration problem.

Duc S
Do It! Do It!™
AMA:REVOMIX
RCK:24005615-01

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06-05-2009 02:55 AM  8 years agoPost 4
cudaboy_71

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sacramento, ca, u.s.

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I have never stripped a gear in the 2yrs I have had my 600n
well, that's not fair. you're using nitro gears on a nitro heli. your testimony has little to do with the electric issue, if one exists.

but, i'll try again...i still have another set of gray gears.

but, a $100 set of blades ever 12 flights is going to get old quickly. i'll pay extra attention to how the tailbox goes together this time. but, you have to really try to mess it up.

just thought i'd see if there's a known issue before trying again.

if it ain't broke, break it.

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06-05-2009 08:00 AM  8 years agoPost 5
krashtagain

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ohio

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There is NO difference in the gears other than the color of them . I fly 600N's and 600E's and have had white gears in the nitro as well as grey gears in the E and to be honest I have mixed matched grey and white because that's all I had . Once again there is NO difference other than the color .

If you're not living on the edge you're just taking up space !

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06-05-2009 11:19 AM  8 years agoPost 6
Ben-T-Spindle

rrProfessor

Central Illinois

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It could be that the color additive makes has an adverse effect on the gear strength.

... BTS

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06-05-2009 11:33 AM  8 years agoPost 7
30636086

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Tacoma, WA

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The theory behind the grey gears for nitro was it stays cleaner.
Thats what I heard too! That the reason of gray in Nitros was that it wont show as much as white.

I dont suffer from mental iIlness, I actually enjoy mine!

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06-06-2009 01:04 AM  8 years agoPost 8
outhouse

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auburn ca

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I asked this same question last year lol and got the same results as posted here bud

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06-06-2009 01:52 AM  8 years agoPost 9
cudaboy_71

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sacramento, ca, u.s.

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but did you have the same problem, or just curious?

'cause if you had the same problem, then i can start keeping score.

p.s. you still flying out at lincoln at all? i havent been out there in a coupla months.

if it ain't broke, break it.

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06-06-2009 04:47 AM  8 years agoPost 10
30636086

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Tacoma, WA

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I have had both colors in mine and like krashtagain said I have mix-mached colors and no problems.
Today, 2 minutes into the 11th or 12th flight on the gears i heard the aweful sound of gears stripping in the air.
Maybe you had a bad one or your tail hit ground enough to weaken it in a prior flight? and just gave up under pressure while you were flying? I did that once too! I landed in uneven spot and the tail tap the ground, nothing seemed to be wrong but 2 flights latter gear striped in the air while under load. I heard a unknown tic-tic-tic, and found out that it was missing 2 teeth and half of the third. I put a set of white gears right there and put it back in the air. The white gears still in it!

I dont suffer from mental iIlness, I actually enjoy mine!

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06-06-2009 05:34 AM  8 years agoPost 11
cudaboy_71

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sacramento, ca, u.s.

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Maybe you had a bad one or your tail hit ground enough to weaken it in a prior flight?
had more than a week passed since i put them in i'd say maybe. but, in this case; unequivocally no. i remember every flight since last friday night when i put the grays in. i typically pull to a 3' hover and t/h auto in to my comfy little portable carpet flying pad. nothing out of the ordinary in these gears' lives....save the last flight.

if it ain't broke, break it.

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06-07-2009 02:17 AM  8 years agoPost 12
outhouse

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auburn ca

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no bud

finishing up the divorce and flying up here

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06-07-2009 10:05 PM  8 years agoPost 13
helibatics

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Cheshire, UK

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Was it the bevel gear that stripped in the air?

I have really good mesh on all the bevel gears on mine but the mesh between the straight cut gear on the main shaft and the tail 'lay shaft' is really loose and the gear loading will be all wrong overloading the teeth.

I cringe every time I pull a hardish piro stop in case the gears let go. There's nothing to adjust the gear mesh on this gear.

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06-07-2009 11:12 PM  8 years agoPost 14
cudaboy_71

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sacramento, ca, u.s.

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yes, it was the bevel gears. there's nothing to adjust on the bevels either. the straight gears (to the auto gear) were fine.

however, i think the problem may have been the bearings. i pulled the tail last night to replace the gears, got the bearings repressed back on the gear (everything seemed fine up to this point). but, when i popped the bearings back into their journals and started to screw down the case the bearings got notchy. and, as i tightened it up the gear was very difficult to turn.

not having the H60125 bearings readily available i just replaced the entire H60122. so, now i have white gears in it again.

no test flight yet though. when i powered on my swash wasnt level...looks like the servo jumped a spline when i landed on the head. i just took off the servo wheel and rotated it on tooth. but, the Vbar did NOT like that. almost lost the brand new set of blades. it was up on one skid and going over. T/H just in time!!!

if it ain't broke, break it.

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T-REX 600 › Gray TT gears weaker than white?
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