Log in

I forgot my password

RDMFC Social Media
RDMFC Facebook Page
Latest topics
» 2019 Llanfair TH Village Fete
Best blade balancing method. Empty2019-07-12, 18:53 by Rich

» Proposals for Model aircraft flying ( CAA registration) April 2019
Best blade balancing method. Empty2019-05-08, 17:49 by Gary M Jones

» Police crash
Best blade balancing method. Empty2019-04-14, 15:36 by Roy

» Bit of indoors
Best blade balancing method. Empty2019-04-13, 16:49 by Roy

» For Sale
Best blade balancing method. Empty2019-03-03, 23:44 by Charles E Cornes

Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

Comments: 1


Best blade balancing method.

Go down

Best blade balancing method. Empty Best blade balancing method.

Post by Mr Moff on 2009-10-20, 16:21

With all this horrible weather today I spent the day in the shed and decided to give the lepton a good going over.
After freeing up some binding links I turned my attension to the blades.
When I first balanced them I put the balance tape on the center of gravity as I read somewhere it was the best method but today I put it near the tip and it needed much less tape.
So is it important to use the centre of gravity for balancing?
In my head I'm thinking all the weight will be at the tip when spooled up anyway?
Whats the best way to balance them?
Cheers.
Danny.
Mr Moff
Mr Moff
Committee Member

Posts : 1200
RDMFC Bonus points : 1433
Join date : 2009-08-25
Location : Rhyl

Back to top Go down

Best blade balancing method. Empty Re: Best blade balancing method.

Post by Guest on 2009-10-20, 17:10

Blades should (A) be of the same weight. (B) Have the same length wise C of G.
if these two criterea are met the blades will balance as a pair without the need for tip weight. Nowdays I would only go down this route if using wooden blades as the build quality of modern carbon blades is so good that you can just fit and fly. The blades I use are within a gram in weight and are matched at the factory. If you really have time on your hands you can balance the whole head with blades attatched Exclamation but this involves removing the head/mast assy and balancing on something like a Hi Point balancer. The same goes for tail blades. The only way to balance is to balance the whole lot on the tail shaft. Since I stopped using wooden blades i have never found it beneficial to balance blades as I have never had a blade induced vibration.

Hope this helps

DaveS

Guest
Guest


Back to top Go down

Best blade balancing method. Empty Re: Best blade balancing method.

Post by Guest on 2009-10-20, 17:15

Sorry forgot to mention that the reason for you having to use less tipp than centre weight is that at the tip you have almost twice the moment arm influencing the ammount of weight needed. ( 5 grams at 10 cm is the same as 2.5 grams at 20 cm )

DaveS

Blimey might need to borrow your white board Andy Twisted Evil

Guest
Guest


Back to top Go down

Best blade balancing method. Empty Re: Best blade balancing method.

Post by PDQ on 2009-10-20, 17:35

My method
Weigh each blade. Measure the difference in weight, Identify the lightest.

The difference is the weight of the balancing tape to apply
.._______________..X.._______________
/______________/..X./_______________/


Mount the blades horizontally flat on a pivot bearing or on a blade balancing jig. Note which blade rises. It should be the blade that weighed less.

Apply the piece of weighed tape to the light blade at a point along the light blade where the blades just balance. Place the centre of the tape across the LE and wrap it and seal to the blade. Make loose ends lie aft.

If you find that the "light" blade seems too heavy.
Then extra mod needed because one blade has more weight at one end than the other. Can be corrected by adding two equal weights.

Summary
Each blade should finally weight the same +/- 0.3 grams
Each blade should have the same "leverage" about the fixing point
If you have to add more than 5 grams then the blades were not a matched pair to start with.

I'm sure there will be other methods

What does Mark do?
PDQ
PDQ
RDMFC Member

Posts : 658
RDMFC Bonus points : 773
Join date : 2009-03-05
Location : Prestatyn

Back to top Go down

Best blade balancing method. Empty Re: Best blade balancing method.

Post by Mark Barnes on 2009-10-20, 17:50

PDQ wrote:My method

What does Mark do?

Hits the floor alot!, To be honest ive never balanced any heli blades so cant comment
Mark Barnes
Mark Barnes
Club Secretary

Posts : 6608
RDMFC Bonus points : 8241
Join date : 2008-11-16
Location : Rhyl North Wales

Back to top Go down

Best blade balancing method. Empty Re: Best blade balancing method.

Post by Mr Moff on 2009-10-20, 18:06

Thanks for the replies guys,most helpfull.
I just hovered in the garden in between showers and it seems fine,then I removed the tape and tried again and it still seems fine so great stuff.
Dave I did what you said with that tight link and it's much better now.Maybe I won't be scared of using it now. Very Happy
Thanks guys.
Mr Moff
Mr Moff
Committee Member

Posts : 1200
RDMFC Bonus points : 1433
Join date : 2009-08-25
Location : Rhyl

Back to top Go down

Best blade balancing method. Empty Re: Best blade balancing method.

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum