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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Blade grip thrust washer assembly
09-15-2009 04:16 PM  11 years ago
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flyingquisinart

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Detroit Area

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Blade grip thrust washer assembly
Have a question,

I've always thought that the assembly is basically the same on each helicopter (only owned a couple):

Large ID grooved washer goes inboard toward the hub (grooves facing out), then the bearings/cage, then the larger ID grooved washer at the outer end, then either a washer, radial bearing, etc, depending on the helicopter.

Is the larger ID thrust washer always inboard? I ask because I bought a replacement grip set for my HDX450 (now 4mm instead of 3mm)and the only way they will fit in the grips is to put the smaller ID washer at the hub and the larger ID washer outboard. They reason they will only fit this way is that the smaller ID washer has a slightly smaller OD than the other one, and fits down into the grip all the way where the larger ID washer is also larger OD and will only fit so far into the grip.

Trying to figure out whether the HDX grip design is wrong or if some helis have the larger ID washer at the grip side. I would think there would be too much slop the way these grips are designed. I test flew it this way, but I have other problems I need to sort out, one being a weak battery and maybe ESC problems so I can't really get a long enough test flight to see if I'm happy with this. It does seem sluggish on collective, but that might be a battery issue.
must have been a downdraft
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09-15-2009 05:16 PM  11 years ago
Swoop

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Newark, DE USA

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The larger hole washer goes in first because it rotates with the grip and the larger hole is extra clearance around the spindle, which does not rotate. Reversing this could cause the inboard's ID to rub the spindle causing unwanted friction.

I'll check my trex450 manual, but I'm pretty sure it says the same as described above and I know for sure Raptor does.

It sounds like a problem with the bore in the grips or wrong thrusts. Check out the trex450 thrusts, I think the inside and outside washers have the same OD, however not sure if it will fit HDX grips. You could also try opening the ID up on the washer that fits all the way in.
Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35
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09-15-2009 05:23 PM  11 years ago
playfair

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Rochester, NY

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The smaller ID thrust ring is always toward the blade, as it centers the bearing. I've had some tight squeezes on my 600; press it in if you have to, just don't mare up the grooved race.
The sky is our canvas
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09-16-2009 08:21 AM  11 years ago
Dennisu

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Langley, B.C. Canada

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flyingquisinart

The larger ID and OD race goes inboard on the feathering shaft. This makes it loose on the shaft and fit tight in the grip. The outboard race has a smaller ID and OD making it fit tight on the feathering shaft and not on the grip. The outer race is affixed to the shaft and inner race is affixed to the grip. It must be this way as this is the only way the bearing can work.
He who dies with the most toys ..... Wins!
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09-16-2009 02:06 PM  11 years ago
flyingquisinart

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Detroit Area

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Thanks, that's pretty much what I thought. I sent an email to helidirect about it - that the thrust washers were wrong for those grips. They can either figure out exactly which ones are right, or better yet just send me the Align grips.must have been a downdraft
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Blade grip thrust washer assembly
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