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HomeAircraftHelicopterHelicopter Main Discussion › Nitro helis discontinued??
01-09-2015 01:44 AM  3 years agoPost 81
EEngineer

rrProfessor

TX

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the balance point is about where the main gear is for all 3 axis
Would think that's pretty close...maybe the tail drive gear on some.

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01-09-2015 01:46 AM  3 years agoPost 82
ICUR1-2

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Ottawa, Ontario

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actually hanging it is very sensitive the slightest breath on it makes the fridge bubble level move. put 1 on fbl gyro to balance it
Last Winter
for my own curiosity I balanced it holding sideways then I hung it up and the tail dropped about 5* after balancing it my way and checking the sideways method it was still horizontal.

just saying is all

spending time, paying attention

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01-09-2015 01:46 AM  3 years agoPost 83
Cobra 46

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Cambridge il usa

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I guess I balance it similer to the way I bal a plane but even then I liked to move it around to make the plane fly with more tail Authority or less

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01-09-2015 01:46 AM  3 years agoPost 84
Aaron29

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USA

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Yeah you're talking longitudinal CG. But fact is, having the CG below that axis tends to mask CG offset.

Take the extreme edition, where the mainshaft is 10 feet long and the head is 10 feet above the body. Obviously no heli is like this, but it illustrates what we're talking about. OK so with your 10 foot stupid looking heli, if you balanced by holding the head vertically, it'd be very difficult to detect any tilt due to longitudinal CG change because the "pendulum effect" would be tending to level the model even as the offset CG is tending to tilt it.

Just read that using the bubble level. Good technique for that method as the tilt will be very small as discussed.

With the sideways method, it's unequivocal. It picks nose or tail and falls that direction. Do it with pinion off for electrics.

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01-09-2015 01:50 AM  3 years agoPost 85
Cobra 46

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Cambridge il usa

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Ya I see what your talking about it makes senc. ( I want that heli we all just pictured in our minds ) I will try the other method and see how much I am off I am not sure how to do it though

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01-09-2015 01:52 AM  3 years agoPost 86
Aaron29

rrProfessor

USA

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The aforementioned use of a bubble level with the hanging technique is probably sufficient.

You offset the masking problem by throwing a precision instrument at it. It's not as unequivocal but that'll work.

It's harder now that we don't have flybars. I used to hang from the flybar.

Also, you HAVE to ensure the bubble level is on a perfectly flat plane. Not all heli designs are going to help you there.

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01-09-2015 01:54 AM  3 years agoPost 87
EEngineer

rrProfessor

TX

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I checked the balance by lifting using the tail drive or main gear to check the longitudal CG.

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01-09-2015 01:55 AM  3 years agoPost 88
Cobra 46

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Cambridge il usa

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So you just hold the heli by the head on its side and balance it like you balance the head on the high point ??

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01-09-2015 01:56 AM  3 years agoPost 89
Aaron29

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USA

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I just grab the sucker by the blade grips, flip it so it's knife edge flying, and it works, LOL.

Totally unequivocal. If the fuselage falls in a direction, add weight until it slows or stops its fall. It's extremely accurate.

If the imbalance isn't enough to overcome the mainshaft bearing friction, you've got either a perfect CG or knackered bearings.

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01-09-2015 01:56 AM  3 years agoPost 90
ICUR1-2

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Ottawa, Ontario

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maybe on a 10' model the pendulum effect might be more noticeable
if it we're hung using a rigid pole.
however we are talking 3-4 inches using a non rigid line on a model that weighs 7 lbs.
just try for your self you'll see what I mean.

spending time, paying attention

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01-09-2015 01:57 AM  3 years agoPost 91
Cobra 46

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Cambridge il usa

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I'm going down and trying it now. !! Thanks guys

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01-09-2015 01:57 AM  3 years agoPost 92
EEngineer

rrProfessor

TX

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So you just hold the heli by the head on its side and balance it like you balance the head on the high point ??
Basically....yes

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01-09-2015 01:58 AM  3 years agoPost 93
EEngineer

rrProfessor

TX

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And not trying to be off topic...

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01-09-2015 01:58 AM  3 years agoPost 94
don s

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Chesapeake, VA

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E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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01-09-2015 02:00 AM  3 years agoPost 95
EEngineer

rrProfessor

TX

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I don't think nitros will be discontinued....

Longer flight times....and people like the sound and smell of nitros...

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01-09-2015 02:01 AM  3 years agoPost 96
Aaron29

rrProfessor

USA

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In fairness, the OP's question was answered multiple times. He can close it any time he wants.

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01-09-2015 02:06 AM  3 years agoPost 97
don s

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Chesapeake, VA

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Joke.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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01-09-2015 02:07 AM  3 years agoPost 98
Aaron29

rrProfessor

USA

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Yeah we also discussed training gear. So you need another lane on that diagram. It's more of an English roundabout.

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01-09-2015 02:08 AM  3 years agoPost 99
EEngineer

rrProfessor

TX

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Joke.
You had me.....

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01-09-2015 02:13 AM  3 years agoPost 100
don s

rrElite Veteran

Chesapeake, VA

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E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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HomeAircraftHelicopterHelicopter Main Discussion › Nitro helis discontinued??
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