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HomeAircraftHelicopterRobbe Cuatro - Millennium - Nova - Dyna-X › setting tail gear mesh question
10-15-2010 10:26 AM  8 years agoPost 1
trillian

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London, UK

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I recently got another Futura SE airframe and noticed that the main drive gear / crown gear on the rotor shaft was able to move up and down (along with the entire rotorhead) about a millimetre or so.

All my others have always been a perfect fit with no movement.

It seems the top bearing block can be shifted down a bit to take up the slack but this worries me that the tail gear mesh might not be tight enough.

It doesn't look like the bottom bearing block is intended to be able to move.

Soooo, my question is; what is the proper way to set the tail gear mesh and adjust where the main gears rest in the frame?

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10-15-2010 12:54 PM  8 years agoPost 2
z11355

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New England

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as I vaguely recall, weren't there shim washers that would fit on top of the brass tube that wrapped the mainshaft. the washers took up the slack between the gear and the bearing block.

throw a piece a cigarette rolling paper between the crown gear and the tail takeoff to get that mesh. it wants to be fairly tight and will bed in.

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10-15-2010 01:19 PM  8 years agoPost 3
trillian

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London, UK

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Well none of my other Futuras have any shims as far as I can see.

That was my first thought. It would need to go on the bottom below the main gear to lift it up a bit.

But I thought I would ask the question here before I just do the shim in case there's something I am not aware of.

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10-15-2010 01:32 PM  8 years agoPost 4
z11355

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New England

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I really think the shim(s) went on *top* of the brass tube 4661 and you were first supposed to press down the whole tail takeoff gear assy so the mesh was correct (w/ rolling paper), tighten that down and then add any req'd shims to the brass tube and tighten down the upper bearing block.

I'm sure people w/ more recent SE experience will chime in as it's been quite a few years since I had an SE (which was carbon framed anyway so perhaps my tolerances were slightly different)

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10-22-2010 03:09 PM  8 years agoPost 5
trillian

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London, UK

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Doh!
Well, I just realised the frames have slots for the bearing block that holds the tail bevel gear. I didn't realise that before and just assumed it had to stay in one place relative to the tail but I guess there is a bit of room for play in the TT.

So, adjusting the mesh is no problem. The top bearing block for the main rotor shaft can also move a little up and down to take up any slack.

Even with the top bearing all the way down there is a tiny bit of play in this airframe, you can feel just a wee bit of movement, but maybe that's OK.

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10-22-2010 03:32 PM  8 years agoPost 6
mopardan

rrApprentice

Wantagh N.Y. USA

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Mesh
Double check your frame, if you have a carbon frame it might have been cut out incorrectly, if so make the holes longer so you can adjust it. Also the gear mesh I would use a regular piece of white paper and push down on it firmly, or news paper it should not grind it should spin freely if there is a whining or grinding or hard to turn its to tight. Also people check your tail rotor gears every so often and make sure there not worn down and are packed with grease. I lacked that check and after take off the Heli went out of control 360s and went in, the gears were gone in the tail worn down to nothing.

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10-22-2010 03:40 PM  8 years agoPost 7
z11355

rrMaster

New England

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frankly, I'm a fan of cig. rolling paper because it's thinner than regular paper and the S4615 doesn't have a lot of engagement in the first place and is oh so easy to strip.

Also, it's a molded gear so it's not unusual to be tight in spots when new until it's bedded-in

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10-30-2010 09:09 PM  8 years agoPost 8
Sparkhead

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Melbourne Australia

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I've always pushed the PTO down firmly onto the crown gear with no paper at all. Its a tight fit to start with but once you land after your first flight its silky smooth with a perfect mesh. Never stripped a crown gear using this method.


Mick.

Robbe & Futaba.

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12-17-2010 08:19 PM  7 years agoPost 9
erichevy

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Zevenhoven The Netherlands

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Also people check your tail rotor gears every so often and make sure there not worn down and are packed with grease. I lacked that check and after take off the Heli went out of control 360s and went in, the gears were gone in the tail worn down to nothing.
You never told me about that Danniel :0)
Was it a gasser or nitro bird?

Eric.

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