ORIGINAL: Stanoo
Sombody eloborate onthe ATV or JR travel adjustments I have always maxed mine out [
] ignorance is bliss I suppose heh and used the dual rates to set my throws mostly on small planes but im fixing to purchase the Big Extreme flight YAK
The 'stock' settings for servo ATVs (or endpoint adjustments) are 100. The maximum value is 150. By increasing the value to 140 (Like Doug mentioned earlier, 140 is a good place to start because it leaves 'padding' for any subsequent sub-trimming you may need to do) you gain a few degrees of servo travel. This allows you to use a longer surface control horn or shorter servo horn...either or both of these scenarios increase mechanical advantage.
If you are decreasing your throws by adjusting the dual rates BELOW 100% then you're effectively decreasing the amount of servo travel. You always want as much servo travel as you can get. Instead of decreasing the rates, move the linkage inward on the servo arm or outward on the control surface horn. Your highest rate should always be 100%.
For people that are having a tough time grasping the 'mechanical advantage' concept this analogy is a good one, and has been used in the past. Think of it like gears on your mountain bike. The front chainring acts as the servo arm, the rear sprocket acts as the control surface horn. For climbing you want to use first gear (smallest chainring in front, largest sprocket in back). This is maximum mechanical advantage and increases the amount of torque to the rear wheel for a given amount of effort applied to the pedals. For speed, you want the highest gears (largest chainring in front, smallest sprocket in back). This is maximum mechanical DISadvantage and makes the bike harder than hell to pedal...less torque to the rear wheel. Obviously there is a trade off for control surface speed when maximizing mechanical advantage, but this is a trade-off you should be willing to make.
I think that the practices listed in this thread should be applied to every plane...from trainers up.
OK, now this is just my opinion...you can NEVER have too good of a servo. Granted putting 8611s all the way around on a trainer doesn't make much sense, but spending $200 more in servos than you had planned for may save you a $200 plane, a $300 engine, and LOADS of bench time. Cheap insurance. Coreless digital metal geared servos on a Funtana 90? YOU BET!
-Tom