soloboss
Posts: 1847
Joined: 9/17/2006
From: Fort Wayne,
IN, USA
Status: offline
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You are heading in my favorite direction. This subject fascinates me more than any other single attribute of the coaxial heli. That flybar is the magic.
There are posts from me using a balsa insert between the top alloy cap of the head and the flybar to restrict the movement. The flybar has no restriction at the center of its travel so hover is excellent, but the flybar is restricted in it's travel so full forward flight is available. The more I restricted it, the more aggressive the flight.
There is a post by a forum member who has drilled, tapped and installed very small screws through the cap so he can set the amount of movement of the flybar.
One method that has proven fully successful is the use of small plastic foam "T" pieces inserted below and above the flybar plastic center section. The foam (electronics packing foam) has enough movement at the center to allow good hover, but it gets more restrictive as the flybar moves toward the extreme ends of movement.
In addition to vector change, the flybar is confounded when you change RPM. Hover the heli at about a foot above ground and give it full forward and full power at the same time. It will tilt nose down an auger its little self forward at an amazing rate. Returning to hover is a challenge - GENTLY pull back on the cyclic (right) stick and reduce collective ( left stick - throttle).
As you noted, the only way to get the CX to move is to destabilize the flybar. The flybar is designed to prevent movement (hover). The less stable it becomes, the more aggressively it flies. And the better the pilot is required to be.
I find that the more aggressive flight the heli is capable of through re-tuning, the more the flight becomes similar to a single rotor heli. If you can't fly a single rotor heli, you can't fly a coaxial heli with the flybar de-stabilized. But I believe the coaxial can be flown with the flybar offering very little correction. I also know that I have had the flybar at the minimal limit of its ability to control the upper rotor and I can't fly it that way. Which is not to say the heli cannot be flown in that manner, I mean that I'm not good enough to fly it that way. I did purchase a single rotor fixed pitch heli (Falcon 40) so I can learn to fly a single rotor. At the point where I can fly a single rotor, I'll move forward with my work on the coaxial.
A major disadvantage to flying the CX size coaxial with the flybar de-stabilized is that the heli is so small and light weight. A 40 or even 60 series coaxial would be far more easily controlled.
Lots of speculation in this post. Moving the servo links outward will offer more aggressive flights, but that change does bring with it more problems.
The choice it is to overpower the flybar or remove the flybar's ability to limit flight. I'm taking the second approach. Others are going the other way. And it's all good.
Great post - I'll watch this one as it develops!
Soloboss
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Soloboss
If everyone''s thinking alike, then somebody isn''t thinking. George Patton
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All Forums >> RC Helicopters >> Electric RC Helis >> E-Flite Helicopters >> Blade CX2 Flight Charisteristics 
Blade CX2 Flight Charisteristics - 
, plus the servos in the second, or even third, hole from the