Hullo Danielle....I see you have again used that link chain & plastic sprockets for the rudder drive again......I think it is a great solution
With the 1:1 ratio.....your Hitec HS325HB servo could throw the substantial rudder from full hard over 110 degrees in ~~0.4 seconds....and for realistic operation you need a steady hand so no not to provide unrealistic rudder movement. From this it appears you have two options that you could consider
1. Increase the diameter of the driven sprocket to provide ~~ 3:1 reduction ratio [sufficient space appears for this diameter] however this would still provide a rudder movement of ~~ 1.2 seconds......
2. The second option could be to install an ACTion P96 servo morph.......these are excellent devices and their reputation speaks volumes for their functionality......you could increase the rudder throw from 110 degrees to ~~ 175 degrees or so, and set the rudder moment speed to a realistic scale
Derek