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HomeAircraftHelicopterHIROBOOther › XSpec main grear how tight?
11-03-2004 07:19 AM  13 years agoPost 1
Henrik Engert

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Cedar Park, TX

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Hi,

I was just wondering how easy it should be to turn the main gear with the engine mounted? It should not spin forever, but is there a good measurement to tell if it is sitting to tight against the pinion gear?

Thanks.

-Hinke

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11-03-2004 07:42 AM  13 years agoPost 2
mrNoodles

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Borlänge, Sweden

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My maingear spins for 1-2seconds.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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11-03-2004 07:43 AM  13 years agoPost 3
Alistair

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that sounds 'bout right... why do you suspect yours is too tight?

squigle

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11-03-2004 09:52 AM  13 years agoPost 4
Henrik Engert

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Cedar Park, TX

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Hi
Because mine does not spind 1-2 seconds. Could that be because it is new? Maybe it all depends on how much force you use to spin it.

-Hinke

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11-03-2004 10:46 AM  13 years agoPost 5
Alistair

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could be a number of things...

have you flown it yet?

you do have to spin it a bit hard...

squigle

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11-03-2004 10:49 AM  13 years agoPost 6
Hercdriver7777

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South Carolina

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I would check engine alignment first. Perhaps the pinion is pressing into the main gear too much. This would mean that the clutch is out of alignment as well.

Good Flying!!

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11-03-2004 10:57 AM  13 years agoPost 7
mrNoodles

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Borlänge, Sweden

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Make sure there´s a tiny amount of up and down play on the clutchbell (less 0.5mm though).

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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11-03-2004 11:17 AM  13 years agoPost 8
I3DM

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Israel

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1-2 secs sounds about right to me too...

www.liorzahavi.com

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11-03-2004 11:22 AM  13 years agoPost 9
Henrik Engert

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Cedar Park, TX

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Hi
Not flown yet. I am a slooow motion builder.

I'll check for up and down movement in the clutchbell and loosen the motor mount bolts.

Thanks for the advice.

-Hinke

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11-03-2004 04:07 PM  13 years agoPost 10
vols77

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Hills of Tennessee

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My maingear spins for 1-2seconds
Make sure there´s a tiny amount of up and down play on the clutchbell (less 0.5mm though).
You all have alot more Hirobo building experience than me and I just need to clarify a couple items to make sure I built the Heli correctly.

First are you all spinning the maingear with engine and clutch installed?
I assume you are just spinning the maingear by hand and not engaging the one way clutch to spin the tail gear.

Second I used loctite to lock the clutch pinion to the inner race of the bearing - so I have no up and down movement of the clutch bell.
I just pushed engine up as far as it would go and then just backed off a hair to get the gap between the top of the clutch and the clutch bell bearing.

One last question, if you spin your main blades in a CCW direction and engage the maingear and pinion, how much gear noise is generated.


Rick

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11-03-2004 04:39 PM  13 years agoPost 11
mrNoodles

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Borlänge, Sweden

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Rick
First are you all spinning the maingear with engine and clutch installed?
I assume you are just spinning the maingear by hand and not engaging the one way clutch to spin the tail gear.
Correct.
Second I used loctite to lock the clutch pinion to the inner race of the bearing - so I have no up and down movement of the clutch bell.
I just pushed engine up as far as it would go and then just backed off a hair to get the gap between the top of the clutch and the clutch bell bearing.
As long as the maingear spins 'freely' (like 1-2seconds) it should be just fine.
One last question, if you spin your main blades in a CCW direction and engage the maingear and pinion, how much gear noise is generated.
Hmm not that much at all. Barely hearable (with canopy on).

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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11-03-2004 08:24 PM  13 years agoPost 12
Alistair

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no where land

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Hmm not that much at all. Barely hearable (with canopy on).
as long as it's belt drive... if you've got tube drive it will be slightly louder, but just...

squigle

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11-04-2004 04:17 AM  13 years agoPost 13
Helinutnz

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below 42 South

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Slow motion builder
I like it. I am slow at building too and way too fussy.
Hey I would just check that you you have some gear backlash between the pinion and maingear. Mine is accurate all around the maingear and is new. It is a very tiny amount of backlash but it is there and runs so smooth. I would be surprised if this was your problem though because of the really accurate machining I have experienced building this machine. Certainly the engine can bind if pushed up too far. I get 1 to 2 secs as well.

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11-04-2004 04:32 AM  13 years agoPost 14
Alistair

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no where land

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it's kind of hard to get a bad mesh on the Hirobo... unless things are shoved up too far... like stated above...

squigle

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11-05-2004 03:31 AM  13 years agoPost 15
okw14

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Morgantown, WV

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...backlash
I don't have the X-Spec, but on my heli's, I place a thin piece of paper (less than 0.1mm thick) between the main and pinion and push the gears tightly together and lock them down. This seems to give just the right amount of backlash.

Keith

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