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Home✈️Aircraft🚁Helicoptere-Elec-Helicopters New or Limited ActivityNext-D › Main shaft too loose in bearing blocks??
03-28-2012 02:58 AM  7 years ago
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Taipan

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Sydney, Australia

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Main shaft too loose in bearing blocks??
I have the NextD metal blocks in my Ballistic. Whenever I pick it up by the head & walk to the flightline I can feel the mainshaft rocking inside the bearings!

It feels like the the mainshaft is slightly too narrow for the bearings??

It flies fine otherwise & a few other brands of helis have the same rocking/play including my old T-Rex 600Es.

Still, a 3rd/bottom bearing block would be nice. I noticed 4 holes in the frames for this, looks like a stepped/downward 'D' cut bearing block could be made to fit.

Anyone notice the same rocking thing?
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03-28-2012 11:20 PM  7 years ago
Sky Dancer

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Bryan, Texas

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I always wick a small amount of green loctite between the top bearing and the mainshaft. It firms up the fit nicely and never becomes loose again.

Whenever I remove the mainshaft, I simply pull the upper main bearing block at the same time....

Don C
Keep up your rotor speed !
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05-03-2012 05:55 AM  7 years ago
Taipan

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Sydney, Australia

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Forgot about this thread. Nice idea mate however it would drive me nuts trying to get the bearings off the mainshaft.
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05-04-2012 03:59 AM  7 years ago
Sky Dancer

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Bryan, Texas

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The only time I've changed out the main shaft bearing was after a crash and then I just replaced the main shaft as well.

But, to replace the bearing without replacing the shaft I just set the bearing on top of an open vise (mainshaft pointing down) and tap the main shaft. It usually pops loose without much trouble.

Don C
Keep up your rotor speed !
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05-04-2012 10:12 AM  7 years ago
MikeyD_From_Indy

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Carmel, In

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I had the same issue, did what Sky dancer said and it went away.

Thanks SD!
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07-12-2012 11:46 AM  7 years ago
Taipan

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Sydney, Australia

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A while ago after an auto mishap I green loctited the main shaft to the upper bearing. No more play there but could feel a little in the bottom bearing. Then a mate had a bash of my heli & his stickbanging loosened the shaft collar about 0.5mm & breaking free the loctite, doh!

Flew loose again for a few flights then checked the main shaft, it had two slight grooves from spinning inside the bearings!! Put in a new shaft & loctited to both bearings. Is now rigid as & zero play, the way it should be.

I still think a 3rd bearing block is a good idea to spread the load as the 2 existing bearings are rather small. IMO all 700E helis should have thrust bearings on the main shaft like Kasama helis. The force on the existing bearings must be insane while doing punch outs, hard stops etc.
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