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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Center of gravity
07-08-2004 10:52 AM  15 years ago
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DarkStaR6

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Croydon, South London, UK

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Center of gravity
I know this has been done to death but my search function dosnt work because our stupid proxy caches the pages & I get a message saying only 1 search every 5 seconds. Arrgh

So anyway, whats the best way to balance the C of G on the heli? Hang it from the flybar and draw an imagenary line through the boom, then spirit level along that line???

I dunno, how do you do it?
Cheers ears...
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07-08-2004 11:19 AM  15 years ago
pepper

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GREAT STATE OF TEXAS!!

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half tank of gas and with the flybar over the left and right, pick it up and see where you are at..

pepper
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07-08-2004 11:25 AM  15 years ago
daz59

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Tokoroa, New Zealand

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Hi,

Fill it with half a tank of gas, grab the blade grips and tip the heli on its side.
Works very well.

Darren
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07-08-2004 01:01 PM  15 years ago
Jeff H

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Cincinnati, OH

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Fill it with half a tank of gas, grab the blade grips and tip the heli on its side.
This is gonna be more accurate than the flybar method.

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07-08-2004 01:14 PM  15 years ago
Dr Lodge

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Guildford, Surrey - UK

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Except the flybar method is easier, less risk of dropping your pride and joy onto the patio sideways, and you can see the angle between the under carriage and the ground easily too.
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07-08-2004 01:20 PM  15 years ago
DarkStaR6

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Croydon, South London, UK

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I dont get why you would tip it on its side? Hows is that going to help determine if the heli is balanced?Cheers ears...
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07-08-2004 01:43 PM  15 years ago
Dr Lodge

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Guildford, Surrey - UK

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The heavy end will move downwards ie either tail or front end
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07-08-2004 02:17 PM  15 years ago
DarkStaR6

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Croydon, South London, UK

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Oh I get it, the heli will turn on the main shaft - so the nose is pointing downwards towards the floor (If its nose heavy) & if it just right it will sit parallel to the floor?Cheers ears...
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07-08-2004 02:26 PM  15 years ago
Dr Lodge

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Guildford, Surrey - UK

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u got it
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07-08-2004 02:27 PM  15 years ago
DarkStaR6

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Croydon, South London, UK

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Nice, cheers fellers!Cheers ears...
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07-08-2004 03:01 PM  15 years ago
Overhead

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Winnipeg, Manitoba CANADA

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Balance Point
Another way to check the balcance which is more sensitive that the flybar lift is to lift your heli with two fingers under the main gear. Just place your fingers inline with the main shaft and lift it slightly.

Some canopies get in the way but on my machines it works fine.

If it's balanced it will lift up nice and level.
Dennis
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12-08-2004 03:35 PM  14 years ago
MikeO

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Chesapeake, VA

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I used the side/tilt method to check my CG and it is tail heavy. I'm not using a tail mounted servo. So how or what do I add to the front of the heli to achieve proper balance?
Thanks

Mike
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12-08-2004 03:52 PM  14 years ago
Crusty

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N51 degrees 29.823 minutes W3 degrees 16.133 minut

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disscussed recentlyI am dsylexia of borg..resistance is fruity...your arse will be laminated
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12-09-2004 05:58 AM  14 years ago
Phranque

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Wherever you go, there you are.

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I used the side/tilt method to check my CG and it is tail heavy. I'm not using a tail mounted servo. So how or what do I add to the front of the heli to achieve proper balance?
Well, my first question would be.... how severely does the tail drop....fast or slow?
Second question would be.... what is your skill level?

A perfectly balanced heli is going to come more into play when you start flipping it around. If you are just hovering, sideslipping, or getting into FF, and a click or two of cyclic trim takes care of it, then I wouldn't worry about it. If you are getting into more advanced manuevers, then it will become more important.
If you want to investigate, try moving your battery as far forward as it will go on the battery tray. If this doesn't do it, rubber band some lead weights onto the front of the tray until it does balance, then weigh the battery & added lead, and go buy a larger battery to make up the extra mass. I hate adding useless weight to any aircraft, so if it is needed, at least try to make it useful....(i.e.. extra battery capacity).
Flying a heli is like seeing the Matrix, it is a mind bending experience.
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12-09-2004 11:50 AM  14 years ago
MikeO

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Chesapeake, VA

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Skill level - Learning to Hover.

The rate depends depends on how I check the balance. Using the flybar method the rate is slow. If I use the "sideways method" the rate appears to be faster. Most posts state check with 1/2 tank of fuel. What if I have a header tank?

I also found that my swashplate wasn't level with neutral stick. Re-adjusted my linkages and hope to test this weekend. Thanks for the responses.

Mike
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12-09-2004 01:21 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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Your swashplate won't be level for neutral trim it will be tilted to the right to compensate for translation from your tail rotor blowing the heli sideways.Andy
AMA 77227
http://www.jaxrc.com
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12-09-2004 04:24 PM  14 years ago
MikeO

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Chesapeake, VA

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I may reading it wrong..but raptortechnique states that the swashplate should be level at neutral trim.

Mike
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12-09-2004 04:50 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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For setting up pitch angles, throws etc the swash should be level. However from a practical standpoint, when the heli is in a hover, it will require (usually) right cyclic trim to compensate for translation. Remember, the tail rotor is fighting rotational torque with a force thats pependicular, whats left is a drift to the left (assuming a right mounted tail rotor) This is trimmed out using right cyclic.

I get that set, then set my throws not to bind to the right, and all is well with the left.
Andy
AMA 77227
http://www.jaxrc.com
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12-09-2004 05:38 PM  14 years ago
Crusty

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N51 degrees 29.823 minutes W3 degrees 16.133 minut

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start..swashplate level with neutral trim, then add trim to balance hoverI am dsylexia of borg..resistance is fruity...your arse will be laminated
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