RunRyder RC
WATCH
 1 page 929 views POST REPLY
HomeAircraftHelicopterThunder TigerOther › Fan Hub & Clutch Balance
04-01-2005 08:47 AM  13 years agoPost 1
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

Yesterday a got myself a high point balancer from our local retail outlet.
I duly arrived at home finished all me chores for other half!
I then set upon my Raptor 60, I whipped out the OS70 and removed the fan and clutch to give the balance a quick check!
The assembly swung on the balancer like a pendulum (kinda easy to find the heavy spot). I couldnt beleive the amount the fan and clutch were out of balance.
I havent flown it yet to see if it makes any difference, i will let you know in due course!
I can completely recommend getting one of these balancers!
I also checked the balance of the tail rotor, this was fine.
Next the rotor head! (after i have painted the wall)
When i do balance the head, do i fit the main gear and check the balance of this at the same time or do i do this seperate?
Hope i aint gone on to long just wanted to share my findings!

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 07:13 AM  13 years agoPost 2
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

What no comments at all?
I must be boring as fcuk!

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 08:11 AM  13 years agoPost 3
mcoccia

rrKey Veteran

Central Jersey

My Posts: All  Forum  Topic

Hi,

I actually think your thread is valid. I have the High point balancer. What did you use for weights for the fan? Also are you balancing the fan and clutch together?


Thanks
Mark

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 08:23 AM  13 years agoPost 4
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

Thanks for the reply Mark!
I did'nt use weights i drilled small holes (not right thru) on the heavy side. I was half expecting the fan to whistle with the holes i made!
Should i have used weights to balance it?
And yes i did balance the fan and clutch together!

Thanx
Hayden

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 09:32 AM  13 years agoPost 5
hepsibar

rrApprentice

Perth WA

My Posts: All  Forum  Topic

At least holes don't come loose like weights can - You did the right thing as far as I am consirned.

I am experimenting with a 30 heli and out of pure laziness I deliberately put in an out of balance fan/ clutch. I am simply leaving the governor counter weight out of one side. The heavy side with the magnet is in the same place as the counter balance on the crank so could possibly reduce vibration. It will be a while before I run it but I may well post my results if I think they are relevant/ usefull.

If the engine vibration seems extensive I will glue in a counter weight and if this makes it worse I will remove it and maybe eve start drilling th elighter side even lighter but not drilling all the way through.

Empty Coffee Cup

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 10:49 AM  13 years agoPost 6
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

My Posts: All  Forum  Topic

Hepsi, you are going down a path WELL traveled. The part of the equation you are missing is side moment.

PM  EMAIL  Attn:RR  Quote
04-02-2005 10:52 AM  13 years agoPost 7
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

Side Moment?

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 10:53 AM  13 years agoPost 8
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

And what is Mechanical Forensic Pathology?
Sounds interesting!

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 10:58 AM  13 years agoPost 9
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

My Posts: All  Forum  Topic

Fixing sh*t that breaks, so it doesn't happen again.

PM  EMAIL  Attn:RR  Quote
04-02-2005 11:11 AM  13 years agoPost 10
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

My Posts: All  Forum  Topic

Side Moment?
The motor is out of balance, yes. The piston is too heavy. The crankshaft counterweight is not too light. Making the crank heavier aides the balance in the verticle moment, increases the imbalance in the side moment. Verticle moment being the time in crankshaft rotation where the counterweight is directly opposite the piston. A perfect balance can be achieved here. Now turn the crank another 90*. The counterweight no longer is offset by the piston/rod weight. The counterweight jumps sideways( side moment). Making the counterweight heavier just increases this error. And so goes the compromise of single cylinder balancing. Balance shafts, and floating counterweights have been used in other applications where cost and flying weight are not issues.

PM  EMAIL  Attn:RR  Quote
04-02-2005 11:30 AM  13 years agoPost 11
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

Thanks for that Al
now i know what side moment is
Im now waiting for a flat four glow engine!
For now i will stick with me nice balanced fan hub and clutch!
Thanks again

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 03:20 PM  13 years agoPost 12
mcoccia

rrKey Veteran

Central Jersey

My Posts: All  Forum  Topic

Al,

I am confused now Are you saying not to do it because of the side balance.

Mark

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 06:49 PM  13 years agoPost 13
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

My Posts: All  Forum  Topic

Mark, what I'm saying not to do, is putting the out of balance fan in alignment with the crank's countewrweight, as in Hepisbar's experiment. Doing the zero balance HighPoint thing is a good thing.

PM  EMAIL  Attn:RR  Quote
04-02-2005 09:01 PM  13 years agoPost 14
mcoccia

rrKey Veteran

Central Jersey

My Posts: All  Forum  Topic

Oh, Where is the counterbalance on the crank? I did not see one. Should the piston be BDC when installing the balanced fan/clutch assy.


Mark

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 09:31 PM  13 years agoPost 15
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

My Posts: All  Forum  Topic

Mark, the couinterweight is part of the crankshaft. If you balance the fan/clutch assembly to be perfectly balanced, you can mount it any way. Hepsibar is confusing the issue by trying an experiment that is destined to fail.

PM  EMAIL  Attn:RR  Quote
04-02-2005 09:40 PM  13 years agoPost 16
mcoccia

rrKey Veteran

Central Jersey

My Posts: All  Forum  Topic

Ok, I just was not to sure. Does everybody balance the Fan/Clutch? I never did. Would I notice the difference after balancing?


Mark

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2005 09:43 PM  13 years agoPost 17
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

My Posts: All  Forum  Topic

Some people enjoy building, and tweaking, as much or more than flying.

PM  EMAIL  Attn:RR  Quote
04-02-2005 11:21 PM  13 years agoPost 18
Atlas321

rrApprentice

Bridgewater, New Jersey

My Posts: All  Forum  Topic

Right On !

PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2005 01:36 PM  13 years agoPost 19
helitubbie

rrApprentice

Dartmouth. Devon. uk

My Posts: All  Forum  Topic

Hi guys

Just for info the balanced fan and clutch has made the hel run much smoother, i balanced the tail rotor also.

H

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 929 views POST REPLY
HomeAircraftHelicopterThunder TigerOther › Fan Hub & Clutch Balance
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Friday, July 20 - 4:20 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online