Hi ,

Instructions for model say 110mm throw on rudder, have a throw meter for degrees, but how do I measure 110mm

Thanks

Difficult to say without knowing the size of the rudder.
Stick it at 45deg and try it out. Dial it up or down as necessary.
We all tend to use far to much rudder throw so down will likely be the direction you'll go.

If 110mm is the sin of the angle multiplied by the radious, then:

angle = arcsin ( 110/L )

where L = rudder chord.

Take a compass, set the radius to the longest chord of your rudder, then draw a quarter circle arc. Put a radius line from center of arc to midpoint of circle, to represent your neutral rudder position. Measure along the circumference of the arc the 110 mm, from neutral to either side, and mark the circumference at one of those points. Draw another radius from the mark to circle center. The angle between that line and the neutral line is the angle they are recommending.

Regardless of what the recommendation is, I would set up for thirty degrees to either side, since anything above that is most likely going to stall the rudder anyway. Pattern ship is not a 3D model, does not need extreme rudder throws. Then, as bla bla says, adjust to suit your preference after flying it awhile.

It is ridiculous for mfrs to give recommendations like this without specifying the method of measurement. Those who know will ignore the recommendations no matter what they say, and those who don't know need the instructions to be more explicit. This is another contribution to the RC industry from the legal profession.

You don't need a throw meter. Just a ruler.

Set the moving surface's neutral point at its trailing edge. You then measure vertically the 110 mm. Adjust the movement of the control surface so that the trailing edge is now 110 mm higher than at the neutral point. You do the same for the down deflection.

Don't worry about angular deflection, don't worry about the fact that the trailing edge moves through an arc as it rotates around the hinges. Just measure the center of the trailing edge. When its verical movement is the same as the recommended amount of throw, you have it set per the instructions. Nothing difficult at all.

For a rudder, you measure horizontally.

You don't need a throw meter. Just a ruler.

Set the moving surface's neutral point at its trailing edge. You then measure horizontally to one side the 110 mm. Adjust the movement of the control surface so that the trailing edge is now 110 mm to one side than at the neutral point. You do the same for the other direction.

Don't worry about angular deflection, don't worry about the fact that the trailing edge moves through an arc as it rotates around the hinges. Just measure the center of the trailing edge. When its horizontal movement is the same as the recommended amount of throw, you have it set per the instructions. Nothing difficult at all.

For an elevator or aileron, you measure in the vertical direction.