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10-27-2011 06:42 PM  7 years agoPost 1


Carmel, In

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Is there only one optimum CG for Heli's? I ask because in the airplane world sometimes you may want a tail heavy CG for certain 3G maneuvers, other times perhaps a more neutral feel, or even slightly nose heavy.

I'm just now completing my 2nd year in Heli's getting more and more comfortable with 3D, and was just wondering if experimenting with different CG's was worth the effort, or if utopia was simply a perfectly balanced Heli for all maneuvers.

10-27-2011 06:54 PM  7 years agoPost 2
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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CG is centered around main shaft , if off when you pirouette you will get a wobbling disc . If your just doing FF (scale) you can get by but beyond that flight can be effected . I'm not an engineer so this is just a start I'm sure .

I stole it ,flew it and gave it back ;)

10-27-2011 07:19 PM  7 years agoPost 3

rrElite Veteran

Birmingham, AL, USA

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Also depends on flying style, for sport+3d (symmetrical setups) you want vertical and horizontal cg on the mainshaft/boom.

(where the mainshaft and boom would intersect if they did - that's where you want both horizontal and vertical cg to be, or as close as possible)

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

10-27-2011 07:20 PM  7 years agoPost 4

rrKey Veteran

Morgan Hill, CA. USA

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Moving the CG around will have effects on inverted flight, climbs, descents and pirouettes.

If the heli is nose heavy, you may trim the heli for a "hands off" hover. When flip inverted, you will have to a lot of "foward stick" to maintain the hover.
Also, on a rapid climb out or decent, the nose will tilt down (in a climb) and up (in a decent) if it is nose heavy.

In general, you want to move the CG around a little to match your heli and your flying style.
Start with the your favorite balancing technique and then just move it around until you get what you want.

The example of the airplane doesn't translate - the CG on an airplane effects the amount of lift needed by the tailplane to maintain a flight condition.
The less lift required by the tail (positive or negative), the less stable the airplane is, and the faster it reacts to the elevator & rudder.

10-27-2011 07:43 PM  7 years agoPost 5
Santiago P


South West, Ohio

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Hey MD,

It is more critical on a FBL machine. With a flybar is not that critical.

Like one said, you can play with it to suit your style of flying.

Is this a nitro or or electric setup????

Optimun for a nitro flybar setup is level balance at mid tank for 3D, 3/4 tank for AMA/FAI schedules.
Same for nitro FBL,

For Electric you want neutral or level for both FB and FBL, 3D application.


10-28-2011 05:36 PM  7 years agoPost 6


Carmel, In

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Thanks, this is electric, FBL.

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