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HelicopterMain Discussion › Flybar above or below the Main Rotor?
03-19-2009 10:21 PM  8 years agoPost 1
procrasher

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Cedar Capids, IA

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I see several head designs out there and many are very similar to an other and basically function the same. I do see two main differences in some heads that I am wondering, which is better? The flybar above the main rotor blades and the flybar below the main rotor blades. I do have my own theory which could be better but I was wondering what others have for an opinion here as well as any scientific proof that may be out there. I apologize if this topic has been discussed in the past or if this is a stupid question as I am still on the lower end of the learning curve.

My thoughts on the subject are this... The main blades move allot of air and create there own waves of turbulence. This air flow I feel could effect the stability and response of the flybar. Thus I would think the design that has the flybar above the main rotor would be more stable and in some designs this also may make the main blades closer to the CG which would be better for 3D flight. I do however see some apposing thoughts forming here, like what about inverted flight as the air movement would be reversed and also the fact that just as much air being put out by the blades is being pulled into the blades so what would it matter which side the flybar is on. And then again, maybe I am missing something all together here and there are entirely different reasons for the 2 designs or maybe it's just a sales gimmick.

If I say duck, I'm not talking about a bird that quacks!

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03-19-2009 10:31 PM  8 years agoPost 2
rotormonkey

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Ottawa, ON - Canada

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Yup, there's already been a discussion on this recently:

http://runryder.com/helicopter/t501730p1/

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03-19-2009 10:33 PM  8 years agoPost 3
airboss

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OC ,california

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as a rc heli flyer, I dont beleive anyone could tell the difference.logo and raptor and a couple others use top flybar and all the others dont. I think its just a design issue so all mfgs dont look the same.

Urukay HPS3 KSE 700 HPS3

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03-19-2009 11:27 PM  8 years agoPost 4
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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make the main blades closer to the CG which would be better for 3D flight.
But then there's always that pesky boom strike to worry about if they are too close...

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-20-2009 12:18 AM  8 years agoPost 5
rotormonkey

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Ottawa, ON - Canada

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Nah, aluminum dampers will fix that right up. Along with some nice razor sharp titanium blades.

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03-20-2009 12:59 AM  8 years agoPost 6
airboss

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OC ,california

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titanium rotors ? got a set of 700mm for sale ?

Urukay HPS3 KSE 700 HPS3

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03-20-2009 01:06 AM  8 years agoPost 7
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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700mm blades made of Titanium - I don't even want to know how much that would cost!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-20-2009 01:50 AM  8 years agoPost 8
rotormonkey

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Ottawa, ON - Canada

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It would be a decapitation just BEGGING to happen.

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03-20-2009 04:53 AM  8 years agoPost 9
mchammer

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California,USA

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the 700mm carbon blades will decapitate just fine.

Peace Through Superior Firepower!!!

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03-20-2009 09:31 AM  8 years agoPost 10
TOSH

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UK.Peterborough

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Above or below

l find the`re best in the bin.

Flybars. Who needs `em.

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03-20-2009 09:39 AM  8 years agoPost 11
Eagle2bravo

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Out flying somewhere

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LOL....

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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03-20-2009 10:36 AM  8 years agoPost 12
artimus

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Buckley WA

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the 700mm carbon blades will decapitate just fine.
1+ ....

Fly Hard......Team Viagra

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03-20-2009 01:11 PM  8 years agoPost 13
kangarooster

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Orlando Fl-USA

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What happens to the paddles when you input cyclic?

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03-20-2009 02:10 PM  8 years agoPost 14
rotormonkey

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Ottawa, ON - Canada

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They twist through part of the rotation to tilt the flybar disc whichever direction you input.

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03-20-2009 02:36 PM  8 years agoPost 15
procrasher

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Cedar Capids, IA

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I don't think Titanium blades would be better than CF blades. Titanium is not as light. Although you could put allot of holes in them and laminate them with something. I am about to buy a CNC mill for my business and I could make titanium blades for a 450 size heli with the mill I am looking at. Anyone want to get on a waiting list for a pair?

If I say duck, I'm not talking about a bird that quacks!

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03-20-2009 02:39 PM  8 years agoPost 16
rotormonkey

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Ottawa, ON - Canada

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You people are nuts! I was just kidding with the metal blades.

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03-20-2009 03:13 PM  8 years agoPost 17
heli-cuzz

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Pittston, Pa. USA

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Nah, aluminum dampers will fix that right up. Along with some nice razor sharp titanium blades.
Sounds like a true RC lawnmower.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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03-20-2009 04:09 PM  8 years agoPost 18
TOSH

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UK.Peterborough

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You people are nuts! I was just kidding with the metal blades.
l`m sure they used them in Germany some years ago. Dont know if they still do.

Flybars. Who needs `em.

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03-20-2009 04:14 PM  8 years agoPost 19
rotormonkey

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Ottawa, ON - Canada

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I know there are definately models out there with metal mainblades. Just seems like a death machine to me. Sure the 700mm carbons can kill you, but I doubt they'd decapitate you. At least they're blunt. Metal blades would I'm sure though.

At least it'd be entertaining to see Conan the Barbarian-esque severed heads rolling around the field.

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03-20-2009 05:11 PM  8 years agoPost 20
kangarooster

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Orlando Fl-USA

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Rotormonkey

I guess I was a little too subtle.
The point I was making was that when the flybar moves out of plane,one paddle moves into the rotor path and one moves away,regardless of whether it is mounted above or below.
There are some small differences that allow flybar mounting position to be used as a tuning tool.

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HelicopterMain Discussion › Flybar above or below the Main Rotor?
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