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A Main Hobbies . Boca Bearings . Modefo's RC Helicopters

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Bergen R/C Helicopters > bergen belt drive gasser
 
 
roto
Heliman
Location: winnipeg

has anyone ever had a main gear shred its teeth in flight.what would cause this?
06-25-2003 Over year old.
 
 
GMPheli
Veteran
Location: W. Bridgewater, MA USA

Mesh wrong? to tight and it will get hot from friction, too loose, only the tips of the gears engage. I like to set the main gear mesh so that there is just a slight bit of free play. I hold the clutch bell, and wiggle the main gear back and forth, looking for just slight movement. You need to check this at all points on the main gear, as there is usually a high spot.

Alan Angus
06-25-2003 Over year old.
 
 
jjones
Senior Heliman
Location: Pendleton, Oregon

I have heard of people using dial indicators to really true the main gear. They are never truly round and can cause like this other guy said a high spot in your gear. Depending on how you installed it to, you could stress the gear and cause it to warp.

It's like a spoke wheel when you tighten the 4 bolts of the main gear to the auto hub. do them slightly on each bolt and work your way around, don't just torque one down and then the others as this will cause it to warp badly.

just an idea...I think gmpheli is right on though. it was just a wrong mesh setup.

good luck

Josh Jones
06-26-2003 Over year old.
HOMEPAGE  
 
 
FalconPilot
Senior Heliman
Location: upstate, NY

I have a lot of experience with this (ask Larry). My chopper has a special g23 with a G230 cyl that Larry built for me. It is VERY powerfull.

At first we were stripping gears on a regular basis. The mesh was set up with just a little slop. The problem is when things are set up this way, not much of the teath are meshing. The design of the gear and pinion allow things to feel tight when they are not. When you feel slop between the main gear and the pinion, it is too loose!

The only way I have found to get the teath to mesh, and have as much contact as possible, is to set them up with just a little drag. The gear will work in during the first flight.

Also, make sure the pinion is square with the main gear. If it is not, all of the gear will not be touching the pinion, and you will loose the main gear in short order.

A little white out correction tape on the main gear will help you see if things are meshing correctly.

Good luck!
06-26-2003 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Yo Chad, welcome to RunRyder! Do you have a machined Delrin gear coming?
06-27-2003 Over year old.
 
 
FalconPilot
Senior Heliman
Location: upstate, NY

Al, Why yes, I do!! along with my new muffler!! It is on my table NOW!!

I am currently working on a "blown" project for the venture (see the speed, drag racing area) so the Bergen may get flown as is for a few days longer, but then the Gov, muffler and "gear to end all gear problems" goes in. Look out! The G230 Bergen will be a force to contend with!
06-27-2003 Over year old.
 
 
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Bergen R/C Helicopters > bergen belt drive gasser
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