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T-REX 250 › Bearing slop?
01-14-2009 05:34 PM  9 years agoPost 1
docjoe

rrElite Veteran

Stockton, CA United States

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I've been flying my 250 for a few weeks now, crashed about 3-4 times and had to replace several parts here and there. I have noticed in the head that there is a lot of slop developing in the bearings of the mixer arms that go to the blade grips and those that go to the swash. Also, I've noticed some slop on the tail slider bearings as well.

Is anyone else having this problem? Is anyone replacing the bearings with higher quality bearings?

Joe
We haven't seen Colonel Angus around these parts for years!

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01-14-2009 06:08 PM  9 years agoPost 2
tohot

rrApprentice

Santa Clara

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No i have not had any problems with it.Mine flys rock sold .

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01-14-2009 06:19 PM  9 years agoPost 3
Jag72

rrProfessor

South of Boston

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Yeah...
I have Noticed a LOT of slop in the upper mixing arms and everywhere else you mentioned also...so I bought all new parts to replace them ....but the funny thing is that even though they are loose the machine still flies great...

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01-14-2009 06:56 PM  9 years agoPost 4
docjoe

rrElite Veteran

Stockton, CA United States

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I got onto Boca Bearings and got a part number:

99MR681-XC-X10

It's a 10 pack for RC uses at $8.99.

Joe
We haven't seen Colonel Angus around these parts for years!

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01-14-2009 10:05 PM  9 years agoPost 5
TaleGunner

rrElite Veteran

Deer Park WA

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yes sloppy but still flys well for what it is

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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01-14-2009 11:32 PM  9 years agoPost 6
FS+

rrApprentice

BKK

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slop on mainshaft bearings.. the mainshaft should bigger 0.05mm.
you can try rotate mainshaft in bearing and look inner race.

Happy helicopter

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01-15-2009 03:25 AM  9 years agoPost 7
caseyjholmes

rrElite Veteran

Portland, Oregon

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Yeah I notice a good amount of slop on the main shaft bearings too.
Grab the head button and push back and fourth and the mainshaft wiggles pretty good. A little bit in the mixing arms as well.
I think I'll just leave the mixing and washout bearings as they are but I wouldn't mind a fix for the mainshaft.

You do notice the slop when you do pitchy maneuvers like tic tocs.
It gives a little wiggle when it's vertical at pitch change
I used to just anticipate that on the 450 and worked it into my thumbs memory to correct it real time.

I got another bearing question..
Did anyone shim the play in their flybar cage? (add thin tiny washers between the flybar cage arm and the flybar bearings?) Mine has a .2-.3mm gap of play I could do without to achieve better rotor balance consistency.

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01-15-2009 11:39 PM  9 years agoPost 8
FS+

rrApprentice

BKK

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problem is mainshaft too small. Mainshaft should fit with inner diameter of bearing not loost as now.

Did anyone shim the play in their flybar cage?

it me.. 1 thinest washer in spare bag, i put one side but other not.

Happy helicopter

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01-16-2009 12:48 AM  9 years agoPost 9
caseyjholmes

rrElite Veteran

Portland, Oregon

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Very nice! It fits! Good work.
I will devise something soon as well for this area. It could help with vibration.

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01-18-2009 01:15 AM  9 years agoPost 10
demosa

rrVeteran

Tigard, Oregon, U.S.A.

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Another way to eliminate the slop in the flybar cage is to squeeze the two ends of it while tightening the set screws in those ends.

Simple and works great. Do not squeeze too much or you may bind the bearings the flybar is riding on...

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01-18-2009 01:41 AM  9 years agoPost 11
caseyjholmes

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Portland, Oregon

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Another good idea. Thanks!
I will try one of these ideas soon.

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01-18-2009 12:17 PM  9 years agoPost 12
Learn to Fly

rrKey Veteran

Yalesville Connecticut

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Another way to eliminate the slop in the flybar cage is to squeeze the two ends of it while tightening the set screws in those ends.
+1


Jeff
Believe nothing you hear, and half of what you see...

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