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Kyosho Caliber 30 & 60 - Concept - Nexus > Problems while building an Concept 32
 
 
- Location: -
Hi,

I'm looking for someone who has bulid one of theese helis... I have problems mounting the engine <-> main rotor shaft. The backlash is so minimal that the main cogg wheel is beeing forced down by the rear cogg wheel...

so i'm just curios if someone has noticed this problem before... i have also dubbelchecked my installation 3 times... but it seems to be some problems in manufacturing.


Regards

//Ronsta
10-12-2001 Over year old.
  WV   EDIT
 
 
freestyle
Veteran
Location: Redmond WA USA

I'm not sure I understand which gears you're talking about, but...

The height of the main gear can be affected by the position of the main shaft in the mast collar. Have you tried loosening the mast collar set screws and sliding the main shaft a little bit? Would it help if you did?
10-12-2001 Over year old.
HOMEPAGE  
 
 
Doug
Elite Veteran
Location: Naples Florida....

By "main" do you mean the Mast to Pinion, or clutch to One way bearing? The Mast gear can be moved up and down and the engine can be shimed to increase the clearance on the other gears.
10-12-2001 Over year old.
 
 
- Location: -
Thanks for replying guys

I have attached an picture of my heli. Hopefully that will make things a little bit clearer.

Axis "A" is forcing the coggwheel "B" on the main shaft downwards so that there is almost no chance for the main shaft to rotate (while holding the coggwheel "B"). That is caused by the engine beeing placed too high (i think).
So, i have tried to lower the engine but that doesnt help it. So i just have to go back to the retailer and ask what he thinks.

//Ronsta
[BREAK]
10-13-2001 Over year old.
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DangerousDick
Veteran
Location: Cheshire, England

When I built my 46VR earlier on this year it came with very thin spacers to place under the main gear to lift over the bearing if required but I found that the fit was real tight as it was so didn't use any.

All I can suggest is that you remove any shims you may have used under the gear, and ensure that the bearing in the motor bracket is pushed all the way home.

Cheers
Richard.
10-13-2001 Over year old.
 
 


Location:

Hi,


No i din't have any shims to come with this kit. And i have also checked extra carefully that the bearing is in it's home position..

Thanks for replying

//Ronsta
10-14-2001 Over year old.
  WV   EDIT
 
 
Doug
Elite Veteran
Location: Naples Florida....

I took a look at the test That was in Rotory, the tightness you mention was mentioned in the test as well. They went on to say that the problem corrected it self after a couple of tanks of fuel....
10-14-2001 Over year old.
 
 


Location:

Thanks Doug!

Ok, then i know that it is the model and not me, that makes me feel a lot better. So ill just have to "burn" in the new heli then

Regards

//Ronsta
10-14-2001 Over year old.
  WV   EDIT
 
 
freestyle
Veteran
Location: Redmond WA USA

Tis is what I thought you meant... see my previous message. Loosen the set screws in the main shaft collar and see if that lets the main shaft (and thus the main gear) move downward a little bit.

Retighten them evenly, or the main shaft gets out of alignment. Also, you will probably need to make some adjustments to your collective pitch linkage to compensate for the changed main shaft position.

If this doesn't solve the problem, then yes you may just need to put a few flights on it. But I'd check this first just to be sure! If the main shaft is too high, all the "burn-in" in the world won't fix the problem.
10-14-2001 Over year old.
HOMEPAGE  
 
 


Location:

Freestyle, thanks again.

I have checked the main shafts position and i have tried to move it but that does not solve the problem.

//Ronsta
10-14-2001 Over year old.
  WV   EDIT
 
 
freestyle
Veteran
Location: Redmond WA USA

Sounds like you might just need to fly it and hope it runs in smoothly. I hope all goes well.
10-14-2001 Over year old.
HOMEPAGE  
 
 


Location:

Thanks
10-14-2001 Over year old.
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vetrider
Elite Veteran
Location: Daleville, AL (Ft.Rucker)

Ronsta, I'm no expert but, if the Gear circled "C" is not square with the gear on the Engine shaft. you will have a problem there. Everything else looks OK. Wish I could see the engine mount part better (above letter C) but theres a bright spot on the pic.
[BREAK]

Magnum Fuel
10-14-2001 Over year old.
 
 
JBolt
Heliman
Location: Mountain View, CA

Gear mesh

Ronsta,

I had this same problem on my second VR. It was so tight it was not possible to turn the gear at all. The problem was with the main gear. This may be hard to explain so bare with me. The area of the main gear that bolts to the one way housing can sometimes be thicker or warped causing the main gear to sit higher than it should thus binding against the bevel pinion gear. This seems to only be on the main gear supplied with the kits. The replacement gears have always fit correctly for me.

The other "fix" would be to slightly enlarge the enging mounting holes in the plastic main frame and let the engine sit lower but this will also loosen up the gear mesh of the drive to counter gear. This can be OK on a 32 but if you ever move up to a 46 or 50 you run a high risk of stripping the drive and counter gears.

Having the gears too tight to start on the 32 is not the best way to go. All you are doing is robbing some power from 32. On the other hand with a 46 it is fine and with the OS50 it is a must. Unfortunately this puts an extra side load on the bronze bushings in the one way housing. It would be nice if a ball bearing had been used here.

On the 32 you want the gear mesh to be snug on the highest spot of the main the gear.

When you get the gear mesh correct and everything fitting as it should put a smll amount of medium thread locker on the bottom of the main shaft(mast) where it fits into the lower bearing in the engine mount. Just don't get any in the bearing. The factory fit here is a bit loose and the main shaft has been known to wear down causing vibration and radio interference.

Jay
10-16-2001 Over year old.
 
 


Location:

Thanks for replying Jbolt!

Right now i just want to sell this friggin model , i have built several rc-cars and airplanes but i have never built such a lousy model before.

This heli has taken all of my patience as i unpack a new bag on the kit a see more and more lousy parts.... shame on kyosho for this sh**
10-16-2001 Over year old.
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PHI flyer
Senior Heliman
Location: Bowie, Maryland

Are you sure the bottom of the main shaft is going into the bearing block on the bottom (top) of the engine. If its not fitting completely into that bearing block that will cause the problem you are describing. I have a concept 30 dx and when I first built it years ago I had the same problem and that is what was causing it. If the 32 is anything like the 30DX its a good flyer when you get it going right.
11-17-2001 Over year old.
 
 
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Kyosho Caliber 30 & 60 - Concept - Nexus > Problems while building an Concept 32
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