Flybar ratio..How do I measure it

[Tom Fiddler]

I have just changed my E-ravens Bell mixers to the ones off my "Parts Predator"
The middle hole on these mixers give the same ratio as the stock ones.
The outside hole (flybar side) are 4mm farther out than stock.
I know moving to the outside hole lessens the flybars authority and gives more cyclic response (It did on my Predator Gasser)
But how do I actually measure the ratio?

[Rodney]

I am not positive but I think is the differance in distance from the hole on the blade grip side. The closest hole is one to one, the middle hole is 1 to 1.3 and the farthest hole is 1 to 1.6. The first hole is the same distance and the blade grip side
the farther out the higher the ratio

[Tom Fiddler]

Thanks Rodney
I'm really wanting to know how to measure the ratio?

[Jeff H]

The easiest way to measure the ratio (unless you like geometry) is to use a pitch gage and a protractor.

for a 1:1 flybar ratio, the flybar will tilt the same amount as the blade moves. Just measure the flybar tilt relative to the blade tilt.

A stock X-cell has a .5:1 ratio and the different bell mixers change relative to that baseline. For instance, if you have a 1.3:1 bell mixer on a X-cell head (same as century) you would have a total flybar ratio of .65:1, or if you flipped the mixer over 1:1.3 you would have a total of .38:1

[GM1]

The "easy" answer is to find how many degrees the blades change versus how many degrees the flybar inputs. The quotient is the flybar ratio. On the old MA heads we used to have "ratios" of 1:1, 1.3:1, 1.6:1 which was actually the ratio of the lengths of the Bell mixers, not the actual flybar ratio. As I recall, the actual flybar ratio of a stock X-Cell head was .47:1 (this is from memory, not calculation). The new Tempest FAI head goes all the way from .6:1 up to .9:1 as Cliff designed it to have a much higher ratio and to be more adjustable for individual taste.

[Chopper]

Hi Gordie. You are absolutely correct as usual, but the mixing ratio also changes the flybar ratio. A one to one flybar ratio will mean that if the flybar is deflected 5 degrees, the blade will change 5 degrees. If the flybar is deflected 5 degrees and the blade changes 2.5 degrees the ratio will be .....ummmmmm......let me se.....ummmmm....two divided by five.....nope doesn't go....ummmm .....cary one..........well anyway, it is less.

I believe the question was answered. So....how's the "Calculus for blondes" class working out???

[Tom Fiddler]

Thanks guys I will do some measuring