Flybar ratio effect in flight, can someone please give me the run down?

[LaurenceGough]

Hi guys,

I've been searching but just can't find any clear relationship to what the flybar ratio effects in flight.

On the flybar seesaw, say, for example there are holes closer and further away from the centre hub.


What would the inner holes do vs the outer holes, and vice versa.


What effects ballooning (Nose rises) in FFF?


Thank you very much,

Laurence

[callum]

Try reading this

it has some information about Flybar Ratios and dampening that should help you out

Setup for F3C

[scallybert]

On the flybar seesaw, say, for example there are holes closer and further away from the centre hub.

What would the inner holes do vs the outer holes, and vice versa.

Outer holes increase flybar authority.

[FWIW, Outrage G5 & 550 manuals cover this, as their heads are programmable.]

[Steve]

3D models tend to have a flybar ratio around 0.7:1 FAI flyers prefer the ratio about 1:1

If you set your collective at mid-stick with zero degrees pitch and tip the flybar up and down from one end, watch how much the blades tip up and down at the same time. If the blade exactly follows the flybar, then it's 1:1. If blade tips less than the flybar then it's less than 1:1. Lower flybar ratio gives you less stability which in turn means more manuoverability, hence the 3D set-up. Higher flybar ratio gives you more stability, so when a gust of wind hits the model and tips the flybar up or down in flight, then it has a bigger affect on the blades, and makes the model more self-levelling.

If you change the flybar ratio on your model then don't forget to recheck your cyclic and collective pitch ranges and readjust on your Tx Swash Mix as necessary. The Vibe 50 has 3 settings on the mixing arms and the standard stock setting when you build it is 0.7 for 3D. I recently moved the ratio by just one hole on the mixing arms to increase the ratio, and it reduced my collective pitch range from +-10 deg to +-7 deg. Easy enough to correct at the Tx, but I just didn't think to check the pitch range when I'd done it. Now I know..... won't do it again. The Vibe 90 has two settings: 0.7 or 1 so you can set the heli for 3D or FAI quite easily.

Most helis will be 3D setup out of the box these days, with little or no explanation of how to set the ratio, so go play and see what difference it makes. Adjusting the flybar ratio and trying different paddles can transform a heli into what ever you want it to be.