T rex 700 flybar

[steve b]

had a conversation down our club yesterday and i was about fitting a shorter fly bar than the stanard one to make the heli more stable? But woundn't make it more twitchy??
i though heavy paddle woulb by the way to go
any thoughts on his

[Steve]

Longer flybar will give more hover-stability and more cyclic response and vica versa. Don't make it too long though as it becomes counter-productive. About 10% longer than the stock one is the recommended limit usually.

Heavier paddles will give more hover-stability, better in-flight tracking and slower cyclic response and vica versa.

[tourerjim]

Would you need to alter flybar or paddles on 700...!

[Sesame]

The 700 is quite flexible it can be setup in its standard form to be very stable, but when flying it around, it can be very manouverable.

best and easiest way of stablising it further is to put on heavier paddles.

[scallybert]

Why ?

Reasonably basic theory says that a longer flybar will speed up the flybar's cyclic response; and that heavier paddles or weights will slow down the flybar's cyclic response.

No problem so far...

What's not so clear is why either will improve stability. (I'm not saying it doesn't - I've got flybar weights on my H200s, and they seemed to help a lot.)

My only guess is that a flybar with a greater moment of inertia is less prone to friction effects impairing its behaviour, etc. Anyone have a better informed guess ?

The purist in me favours changing the mixing ratios in the head to increase the flybar authority. (If possible.)