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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Center of Gravity on a Flybarless Heli - HOW ?
12-20-2010 07:47 PM  9 years ago
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wrathofkhan

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LA, CA - US

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Center of Gravity on a Flybarless Heli - HOW ?
Hello,

I was hoping to find out how you all figure out if the heli has the correct CG or not. I have heard that I should lift the heli sideways (holding the head), if it swings down towards the nose - then it is nose heavy (and vice versa). Is there any other way of figuring out if the heli is nose/tail heavy, or is the procedure mentioned completely off?

Thanks. Khan
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12-20-2010 07:51 PM  9 years ago
Supercoolheli

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Dallas, TX

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the only way i could think of doing it, and the way i do it, is just use your 2 index fingers under the blade grips and lift it slowly up. If the tail fin hits the ground before it's in the air then you're tail heavy. If the tip of the canopy hits the ground before you're in the air then it's nose heavy. Now that i think of it, my Rave is tail heavy...probably should do something about that
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12-20-2010 10:04 PM  9 years ago
AirWolfRC

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42½ N, 83½ W

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Flybar or flybar-less, CoG is the same . . . at the main shaft.
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12-20-2010 10:10 PM  9 years ago
McCrasher

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Ventura, Ca, USA

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I will sometimes use a piece of cord to hang the heli. I have also used the blade bolts as finger holds. All with the main blades off.

Mike
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12-20-2010 10:18 PM  9 years ago
Jeff polisena

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westpalmbeachflorida usa

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grab main grip and hold heli as if doing knife edge ,if tail drops, tail too heavy ,if nose drops ,nose too heavy
I have heard that I should lift the heli sideways (holding the head), if it swings down towards the nose - then it is nose heavy (and vice versa).
I stole it ,flew it and gave it back ;)
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12-21-2010 10:21 PM  9 years ago
FLYINFOOL

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Cudahy, WI

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Holding the heli sideways is the correct way to check any heli.
Check it once with the boom pointed left and once with the boom pointed right or the one way can fool you.

Picking it up by the grips or the flybar will only show a gross out of balance condition.
Jeff Borowski
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12-21-2010 10:27 PM  9 years ago
GMPheli

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W. Bridgewater, MA USA

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"Picking it up by the grips or the flybar will only show a gross out of balance condition."

I dissagree. Picking up by the flybar will do the same as holding the heli on its side. They both use the exact same balance method. You are holding the helicopter at the center of gravity, and allowing the heavy end to fall.
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12-21-2010 11:05 PM  9 years ago
hobby_man

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MPLS, MN

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Good luck bending the flybar
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12-21-2010 11:26 PM  9 years ago
Aaron29

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USA

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Hold the by the blade grips, heli knife edge and see if it swings nose low or tail low.
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12-21-2010 11:53 PM  9 years ago
McKrackin

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Lucasville,Ohio

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Knife edge.

Nitro will be good with the tail pointed either way.
Electric needs checked with the tail pointed both ways to take the OWB out of the equation.
I literally never use the word literally right.
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12-22-2010 02:01 AM  9 years ago
GyroFreak

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Orlando Florida ...28N 81W

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OWB out of the equation.
Whats OMB ???
I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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12-22-2010 02:03 AM  9 years ago
McKrackin

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Lucasville,Ohio

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Quote
OWB out of the equation.
Whats OMB ???
Don't know.lol....

A OWB however is a one way bearing.
I literally never use the word literally right.
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12-22-2010 02:27 AM  9 years ago
GyroFreak

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Orlando Florida ...28N 81W

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Oh yeah, guess a little dyslexia kicked in.I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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12-22-2010 02:33 AM  9 years ago
jsenicka

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Eagle River, WI

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yeah, I had huge problems with my One May Bearing on my 550e Jim Senicka
Team Manager, GrandRC Flight Team
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12-22-2010 02:39 AM  9 years ago
McKrackin

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Lucasville,Ohio

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Yeah,on an electric,it only free-wheels clockwise.
That means you need to hold it knife edge with the tail pointing both ways so it will have the opportunity to turn freely either direction.

If it's nose heavy,the nose will dip with the tail pointed right.
If it's tail heavy,the tail will dip when the nose is pointed right.
I literally never use the word literally right.
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12-22-2010 12:34 PM  9 years ago
LonR

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Macomb,Mi

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McCrasher
I have also used the blade bolts as finger holds. All with the main blades off.
+1.Been doing it like that for the past 2 years and balance is always perfect,on nitro and electric..
600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan
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12-22-2010 01:18 PM  9 years ago
Jeff polisena

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westpalmbeachflorida usa

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The sure way is to hang Heli from bolt hole in head for button . Take a bolt drill hole thru and put ring on and leader line from fishing poleI stole it ,flew it and gave it back ;)
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12-22-2010 01:25 PM  9 years ago
ShuRugal

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Killeen, TX

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Flybar or flybar-less, CoG is the same . . . at the main shaft.
good job reading the OP.
AMA 700159
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12-22-2010 01:40 PM  9 years ago
Bundian

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Fort Lauderdale, FL USA

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Turn it knife edge and check it like that, as most of the other people say.
I've been flying flybarless for the past 2 years, I've always checked it like that and with a little fiddle with the batteries it's always dead on
Fly it like you stole it!!!
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12-22-2010 05:43 PM  9 years ago
McCrasher

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Ventura, Ca, USA

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I forgot about the other way you can check it and it will take the OWB out of the question. Move the motor away from the main gear just enough to disengage the gears, if you can. The TRex 700E with the stock motor mount can't be moved, most of the others I have seen can. Then you can check it using the knife edge method and it can spin either way. The motor will change the CG very slightly when you return it to proper mesh, but it shouldn't be too far off. About the same as removing the pinion, but a whole lot easier to return on most of the heli's I have seen.

Mike
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Center of Gravity on a Flybarless Heli - HOW ?
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