Help needed JR 9x2

[jimmyo]

Can any one assist with the swash setup the only thing im stuck on is in the swash setup you get the option to have expo ? the if you select it you are then unable to do anything with it does it mean its on or off as I thought you would beable to make adjustments to the expo ?
any help would be great

[Smoothound]

It's on or off

[Steve]

If you're setting up a CCPM heli, then the expo 'on' option mathematically increases the linearity of the response. So, if you want a simple pitch range of 0 deg at the bottom, 5 deg in the middle and 10 deg at the top, you would think that your pitch curve might look something like 0%, 50% 100% say.

However, because you are using a circular motion from the servo output to produce a linear movement at the swash plate, in order to get the 5 deg in the middle, you need say 30% servo movement, not 50%, but you still need 100% to get the 10 deg at the top.

When turned on, the expo function removes this error, so you'll get the desired half way pitch value at 50%.

This is complicated to explain, but is basic middle-school trigonometry at heart, and isn't that difficult to understand with a picture, and I did it once on here yonks ago, but will have to search for the thread post.

I can't find it. Ade started the thread last time. Maybe someone else can find it. It was asking the same question.

Basically, I would turn it on before you do al your curves and setup. I always have it activated in my CCPM helis on my 9xii.

[Steve]

This should help explain it.



If you consider a servo arm one inch long that can rotate clockwise through 90 deg from horizontal to vertical, then it will produce a linear movement of one inch upwards.

You might expect tha in order to produce half an inch of linear movement, then you simply rotate the servo arm by 45 deg. Well no, this is the crux of it. The red line shows a 45 deg movement,which actually gives you 0.7 inches of linear movement. In order to get 0.5 inches, the angle of rotation required is 30 deg (because SIN 30 = 0.5 from school trig) shown by the blue line.

The Exp function on the JR 9Xii removes this error giving you a much more linear output from the servo arm.

The linearity of the output is a function of the angle of rotation, not of the length of the servo arm, as the same proportions would be found even if the arm were one mile long.

[jimmyo]

Many thanks for that now I fully understand very well explianed