View Full Version : The definitive way to figure out Bell-Hiller ratio
ShawnK
08-01-2006, 11:04 AM
I've had to revisit this issue lately and admit that I don't know what I'm doing.
How does you figure out your actual Bell-Hiller ratio?
DavidH
08-01-2006, 11:23 AM
Degrees of fly bar tilt to degrees of input to blades.
1 degree of flybar tilt inputs .9 deg blade = .09 ratio
I may have the formula reversed. But that is general idea.
David
ShawnK
08-01-2006, 11:55 AM
So how do you measure that flybar tilt?
DavidH
08-01-2006, 12:01 PM
With a protractor and a level. Or Home Depot and Lowes sells the an angle finder.
Similar to this
http://roofgenius.com/roofangle.htm
David
ShawnK
08-01-2006, 12:14 PM
Well hey, that's not too shabby. I'll have to look into that.
Incidentally, from what I've read, it seems that a 1:1 ratio is almost the "Holy Grail" for FAI setup. What is it about that ratio that's so sacrosanct?
DavidH
08-01-2006, 12:39 PM
Just the ratio that works the best for contest type flying. Contest pilots are the ultimate when it comes to experimenting with different things. You want to know about rotor head geometry. Talk to Wayne Mann, he is like an encylopedia on rotor heads. Wayne tries all these different settings out, he goes to the practice field he is always changing ratios and delta settings.
David