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HomeAircraftHelicopterMain Discussion › blade balancing parameters
04-10-2010 11:30 PM  8 years agoPost 1
RescueRev

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Albany, Oregon

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I am trying to find out when you would add weight to a blade. I did a blade balance search on RR and didn't find what I was looking for.

Example: Blade # 1 weight is 35.55 g
Blade # 2 weight is 35.90 g

Would you add weight to the light blade as a rule or what weight guide lines would you use? I used a Cent-O-gram scale to get the weight.
I am still a new guy and still haven't flown my newly purchased Rave 450 yet but that hopefully will change pretty soon. My Rave came with CY carbon fiber blades so I bought a set of fiberglass blades to ding first. So I took the opportunity to learn about blade balancing on the fiberglass blades. So I painted some orange stripes on the blades and rebalanced the blades. I used a Koll Rotor Pro for this. I got the weight of blade #1 to 36.09 g and the weight of blade # 2 to 36.11 g. I believe this is over kill but was a great learning experience. So are there any guide lines for when to add weight and when not to add weight? How much weight difference can you just let go and fly the blades?
RescueRev

RescueRev

RescueRev

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04-11-2010 12:16 AM  8 years agoPost 2
FlaG8r

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Florida

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FWIW, I've never balanced any Radix blades, always been great...further I've never bothered balancing anything larger than 325 mm blandes. I'd say fly them, if you see tracking issues that can't be solved through moving the links in or out than worry about it.

Life is tough, it's tougher if you're stupid

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04-11-2010 12:41 AM  8 years agoPost 3
zaw

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Lebanon, NH - USA

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Overall weight of the blade doesn't really play much, if the root is heavy no much of deal but if the tip is heavy you will see some problem. my Gaui 425 have two blades that are off by .08g overall but ROOT to TIP weight the same, Tip to ROOT has slight difference(Root Heavy). I put them on and they flew perfect.

I would just put them on, if they vibrate very bad than I'll take them out and balance them.

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425

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04-11-2010 12:56 AM  8 years agoPost 4
RescueRev

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Albany, Oregon

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blade balancing parameters
Yes I understand what you are saying. I just would never put a set of blades on without checking them out. So when you check and there is a weight difference between the two blades how much weight difference in grams can you let go? I have read three books on RC helicopters and no one discusses what the weight limits are. Or do the blades haft to be perfect with regards to their weight being equal?

RescueRev

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04-11-2010 01:18 AM  8 years agoPost 5
dkshema

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Cedar Rapids, IA

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I check their CG to make sure they are closely matched, and I check their weight.

I have yet to run across a set of CF or Fiberglass blades where the CGs have been off by more than a couple of millimeters, and the weights have always been within a couple of grams of each other.

You're off by 0.35 grams...negligible, and no balancing needed.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-11-2010 01:35 AM  8 years agoPost 6
RescueRev

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Albany, Oregon

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blade balancing parameters
The CG was off by just 2 or 3 millimeters when I got them. But after painting the CG is perfect. What I have been wanting to find out is just how much weight difference between two blades can you let go and at what point would you balance. The books I have read talk about how to balance but not when to balance. You said just go with a .35 gram difference, would you do the same if that number was .85 grams. Just where is the stop and go point? Or am I being to picky?

RescueRev

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04-11-2010 01:36 AM  8 years agoPost 7
Yug

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UK. Herts

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You should find both the chordwise and spanwise balance point using the diagonals, razor blade & masking tape technique. This information coupled with the weight of each blade, will tell you where you need to add or remove weight. Same applies both to mains and TBs. In many respects, the latter is more important due to the damaging effects of high frequency vibes especially on carbon machines.
For the mains, I would be more comfortable if the CGs were within 0.2mm and 0.1g given that this will impart a substantial amount of vibration if you're running high head speeds in excess of 3k on the 450.

Vegetable rights and Peace

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04-11-2010 01:44 AM  8 years agoPost 8
RescueRev

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Albany, Oregon

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blade balancing parameters
My CG's were perfect after painting and my weight difference was .02 grams after I balanced the blades. Chord wise they were perfect. I haven't tried to do any tail blades yet but I guess I should before flying my Rave for the first time. I am using a Koll Rotor Pro to balance and a Cent-O-Gram scale to weigh the blades. The scale is good to the hundredth of a gram.

RescueRev

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04-11-2010 01:50 AM  8 years agoPost 9
Yug

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UK. Herts

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You sound good to go. The 4 bar Cent-O-Gram is a good piece of kit, just remember to hold your breath
Do check your tail blades as this is just as important on consideration of the problems that can arise. For some reason, many seem to ignore the importance of this.

Vegetable rights and Peace

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04-11-2010 03:44 AM  8 years agoPost 10
RescueRev

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Albany, Oregon

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blade balancing parameters
I will be sure to check the tail rotor blades. Do you also check the cord on the tail rotor blades? There pretty small.

RescueRev

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04-11-2010 06:58 AM  8 years agoPost 11
Solmanbandit

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Tucson , AZ

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Balancing using a scale? I just use of these balancers and never had a problem. If it levels out, good to go.
http://cgi.ebay.com/Helicopter-Blad...a#ht_1593wt_785

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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04-11-2010 05:33 PM  8 years agoPost 12
RescueRev

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Albany, Oregon

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blade balancing parameters
I use the scale to make sure the weight between the two blades is as close to perfect as I can get them. I use a Koll Rotor Pro to get the CG spot on and to check the chord balance and correct if necessary. I have been told the chord balance rarely needs adjustment.

RescueRev

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