RunRyder RC Helicopter Topic - CofG question

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Beginners Corner > CofG question

hazchem88
Senior Heliman
Location: W.Mids UK

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I'm adjusting the CofG on my Trex 600 (with DJI autopilot and video downlinnk),
I can't move any of the hardware, so I am choosing lipo's of the right weight to stick in the nose to get the CofG aft, as currently it is tail heavy.

No problem doing this, but I just wonder,

is it better to have the extra weight to get the CofG right under the main shaft,

or lose the weight and have the CofG elsewhere (and trim the cyclic on the radio)?

I am thinking the former. I suppose the extra weight is OK as long as the motor can cope?

any thoughts?

thanks

10-31-2009 07:14 PM

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reaper31
Senior Heliman
Location: Centennial, CO, usa

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i don't think its ever a good idea to not balance be it a heli or a plank, i would also vote to the extra weight and have it stable.

10-31-2009 08:04 PM

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2LTime
Veteran
Location: Walworth,NY

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Quote
I am choosing lipo's of the right weight to stick in the nose to get the CofG aft, as currently it is tail heavy

This makes no sense, Do you know what "aft" means? Moving the C of G aft would make it more tailheavy.

Quote
is it better to have the extra weight to get the CofG right under the main shaft

This is confusing too. Since generally people want the Cof G right under the main shaft, adding weight there will do nothing to change the C of G. It'll just make the heli heavier.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

10-31-2009 08:38 PM

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BarracudaHockey
rrMaster
Location: Orange Park FL

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Ideally you want the CG under or slightly ahead of the main shaft.

Electrics are nice, you dont have a forward or aft tank burning off and changing the CG.

If you're doing AP or scale like flight, CG can be adjusted with trim without it being a big deal as long as its kind of close. But if you're into 3D you want neutral trim or else the trim will be opposite when you're inverted. Also it could make the helicopter behave strangely in fast forward flight if the CG is off and its corrected with trim you could get balloning or nose tuck.

AMA 77227
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10-31-2009 09:15 PM

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hazchem88
Senior Heliman
Location: W.Mids UK

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yes sorry I meant fore not aft

11-01-2009 09:10 AM

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T-Rex-Flyer
Key Veteran
Location: Panama City, Fl

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Quote
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is it better to have the extra weight to get the CofG right under the main shaft
--------------------------------------------------------------------------------

Quote
This is confusing too. Since generally people want the Cof G right under the main shaft, adding weight there will do nothing to change the C of G. It'll just make the heli heavier. Jeff

Jeff, I think your over reading the first quote above, he's not saying add the weight under main shaft, but is it better to add weight to get center of gravity under the main shaft. The answer to that question is yes.

If BarracudaHockey says it, do it.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

11-01-2009 02:59 PM

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Beginners Corner > CofG question

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