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Scorpion Power GLOBAL 3D
HelicopterMain Discussion › Blade balancing
04-14-2017 05:09 AM  39 days agoPost 1
joshreynolds777

Senior Heliman

Willis, Tx

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I'm sure the information is somewhere on this site if I Looked for it. But...

Blade balancing...
What's the best way to accomplish this ?

I now know for sure my 770 blades are out of balance. Because slapping on brand new 750's have it tracking perfectly now. The weight is so much less on the 750's making the heli preform so well I may not even want to run the 770's any more. But it would be dumb to toss them

For those of you who have read some of my other posts, yep these are the same 770's I chipped. I'm making repairs on them. But for sure will need to balance them if I ever plan on using them again or selling.

What scale and procedure do you guys use ?

Thanks in advance

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04-14-2017 12:42 PM  39 days agoPost 2
allns47

Key Veteran

Richmond IN.

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Ive only bought maybe two pairs of blades that were balanced perfect from the get go...but come on there is tons of info out there..and I'm not trying to be a butt but come on...i use helimax blade balancer..can be bought cheap on ebay and works great

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04-14-2017 12:46 PM  39 days agoPost 3
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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Ditto... if even asked, it should be in beginner forum.

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04-14-2017 02:26 PM  39 days agoPost 4
Richardmid1

rrProfessor

Leeds, England

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No scale required. First determine the C of g of each blade and adjust by adding stickers/tape to either the root or tip of the blades.

Then bolt them together using a setscrew with the head cut off and a couple of nuts and washers. Then with the blades straight out lay them on something so they can pivot freely (I use a slightly open vice). Now add tape/stickers to the lighter blade on the C of G point.

60% of the time, it works every time!

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04-14-2017 03:21 PM  39 days agoPost 5
Pistol_Pete

rrProfessor

Seffner, FL

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...and now with visual references

https://m.youtube.com/results?q=blade%20balancing&sm=3

Whatever happened to JB_Turner

Edit...corrected above name.

~~Enjoying the hobby one flight at a time~~

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04-14-2017 05:37 PM  39 days agoPost 6
ICUR1-2

Elite Veteran

Ottawa, Ontario

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get one of these

http://www3.towerhobbies.com/cgi-bi...p?&I=LXKHJ7&P=7

using the scale find the balance point of each blade first then mount both blades figure out which blade is lightest then add weight to match the chord cg

spending time, paying attention

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04-14-2017 05:51 PM  39 days agoPost 7
EEngineer

Elite Veteran

TX

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Who is JDTurner?

Logo 600SXs, 700XX, 800XX

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04-14-2017 07:58 PM  39 days agoPost 8
joshreynolds777

Senior Heliman

Willis, Tx

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I've only had two pairs of blades out of 20 with any issues.

I got some things ordered this morning.

Thanks guys

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04-16-2017 07:44 PM  37 days agoPost 9
AirWolfRC

rrProfessor

42½ N, 83½ W

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Most people make way too much of balancing blades.

I just bolt the two blades together and balance them on the bolt like a see-saw. Add weight to the light blade tip as needed to balance and call it done.

Now if you want to get into the differences of Moment of Inertia around the blade bolt - - - there's not enough there to be concerned about - - - let alone to have an effect.

A few bugs on the leading edge or grass stains from inverted hovers will throw all that off anyway.

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04-16-2017 08:57 PM  37 days agoPost 10
joshreynolds777

Senior Heliman

Willis, Tx

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To the tip. Ok. Nice.
That's funny about the bugs lol. I was wondering about that. The bugs are bad here. And they really seem to be attracted to the heli!! Every time I come down it's like it's been through swarms. That takes a lot of guts

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04-17-2017 08:21 AM  36 days agoPost 11
joshreynolds777

Senior Heliman

Willis, Tx

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ok well,
I went to balance the 770's and they're balanced already.
MY Guru showed me the process.

So what does this mean ?

The 750's I have on there are totally fine.

But the 770's don't track well.

Does this just mean I would need to adjust tracking if going back to those 770's ?

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04-17-2017 01:05 PM  36 days agoPost 12
JuanRodriguez

Elite Veteran

The Villages, Florida

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You've answered your own question.....

Been there, done that and old enough to know better.....

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04-17-2017 03:55 PM  36 days agoPost 13
AirWolfRC

rrProfessor

42½ N, 83½ W

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Balance and tracking are two separate issues.

Balance deals with the blade weights.

Tracking deals with the blade angle of attack.

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04-17-2017 08:00 PM  36 days agoPost 14
Pistol_Pete

rrProfessor

Seffner, FL

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But the 770's don't track well.
Is this base on seeing a double tracking line when hovering at eye level?
Does this just mean I would need to adjust tracking if going back to those 770's ?
When you switched to the 750, did you have to adjust anything to have them tracking fine?

Technically IF tracking is fine with the 750, then it should be the same with any other size blades.

Otherwise, what you may have is a blade bolt hole that was not drilled at 90 degree to blade root or one that is twisted or bent.

First test:
Extend blades and set to zero pitch with a pitch gauge closest to root then slide gauge a couple of inches at a time and verify pitch remains equal all the way to the tip.

Second test:
Leave blades extended and at zero pitch and measure blade tip to bench-table top distance. Rotote head 180 and measure the other blade at the same spot on table. (Example: both blades measured on left side of heli)

Given your 750 are tracking well, no need to suspect the blade grips or links.

~~Enjoying the hobby one flight at a time~~

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04-17-2017 09:58 PM  36 days agoPost 15
joshreynolds777

Senior Heliman

Willis, Tx

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That's correct.
When installing and hovering the 750's... perfect.
The 770's show a very slight ossilation at the top of the main shaft. And maybe 3/8th" of a tracking difference

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04-17-2017 10:21 PM  36 days agoPost 16
JuanRodriguez

Elite Veteran

The Villages, Florida

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Re-track the blades and be done with it .... you're fretting over nothing.....

Been there, done that and old enough to know better.....

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04-18-2017 10:42 AM  35 days agoPost 17
Richardmid1

rrProfessor

Leeds, England

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Add weight to the light blade tip as needed to balance and call it done.
That gets them statically balanced which is useless really. You would be much better off adding the weight to the center of the light blade (roughly where the c of g is)(slightly further out towards the tip for FBL blades).

60% of the time, it works every time!

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04-18-2017 06:10 PM  35 days agoPost 18
AirWolfRC

rrProfessor

42½ N, 83½ W

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That gets them statically balanced which is useless really.
Don't knock it until you've tried it.

If you want to do it the hard way then knock yourself out.
- - - But I don't drink that koolaid.

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04-18-2017 07:17 PM  35 days agoPost 19
MattJen

Elite Veteran

UK

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tried both ways, yes adding at the tip works, and I have read all the debates etc,but the best way is still
find the c of g, match the c of g, balance on the c of g.

Having flown precision flying I have never had any vibration and in my large scale models I have never had bits fall off or canopy screws come out due to vibes.

Yes it takes longer adding it onto the c of g but when I am flying 6K of machine what is a couple of hours work and effort in getting them perfect.

Adding weight at the tip moves the c of g...there's no ifs ands or buts, it does, whether you can tell the difference or not is irrelevant, it does cause a machine to fly with blades that are not balanced even if it is a couple of grammes, if like me your flying serious hours not just seasonal, 150hrs plus it will cause additional bearing wear over time..

EDIT
At the head speeds people fly at now 2000+ you will see it and feel it..

All The Best

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04-18-2017 07:27 PM  35 days agoPost 20
AirWolfRC

rrProfessor

42½ N, 83½ W

My Posts: All  Forum  Topic

I suspect you have not done any direct comparisons.
- - - keep drinking the koolaid - - -

Do you even know the difference between monent and moment of inertia ?
- - - without looking it up first ?

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HelicopterMain Discussion › Blade balancing
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