when do you use any of the other holes on the servo arm .example if you need to increase the throw alot
more than the lets say your trainer that is set up for learning, and now you want to have quicker response
etc'

the closer you put the pushrod to the control surface the more throw you will have.but do it one hole at a time so you can get used to it

All the holes on the servo arms are for the adjustability of your control throws. The further the hole from the center of the arm, the more control surface deflection you will have. Also, the further from the center, the less torque you have. The difference is not noticable in most applications. I usually keep mine at about 2-3 holes out on the servo, and then adjust the throw on the control horn on the elevator. All the options are for adjustability, so you can get the throws you want without needing a computer radio.

Silent J

hey guys stick with me on this would you explain to me surface deflection, torque. i think surface deflection
is the distance the lets say rudder moves from center to left or right
is the control horn used for small adjustments?.

You hit the surface deflection right on. It can be judged as the distance the outer edge (opposite from the hinges) of the control surface moves from the center to each end of its throw. As for torque, that's one of the ways to tell the power of a servo. An average servo has a tourque of about 50 ounce-inches. This means that at 1 inch out on the arm from the pivot of the servo, it can move--or at least hold--50oz of weight. Adjusting which hole on the control horn that is used will change the amount of deflection you get. The closer the hole is to the hinge of the control surface, the more deflection you will have. If you want a more detailed description, let me know. I could fill you in on the geometry of it if you don't know about it yet.

Silent J

silentj Pease do give me some more detailed info.
this has been a thorn in my side for awhile.[img]i/expressions/face-icon-small-sad.gif[/img]

If your shoulder was the hinge line and your arm was the control horn. At your elbow it might take 50lbs of pressure to push your arm down while holding it out straight. At your wrist it will only take 25lbs. This is the same as a control horn. Out at the end it is easyer for the servo to push it than at the root. It is the opposite at the servo arm. Stand an arms length from your buddy with your arm sticking straight out to the side. Push him on the shoulder and try to move him forward. Then move 1' closer and move him with your elbow. It is easyer with your elbow because you have more leverege. The same for a servo. The closer to center on the output arm the more power it has. The problem is if your pushrod is all the way in at the servo and all the way out on the control horn the control surface will only move maybe a 1/4". You have to find the middle ground here. Have the control rod midway on both and if you have enough throw your in business. If not move out one hole at a time
until you do. Hubber says not to use the radio to turn the travel up to 150%. I would take his word for it and use only the linkage to get the proper throw. I hope this gives you a better understanding. later daveo

[img]i/expressions/face-icon-small-smile.gif[/img] THANKS GUYS will I get the idea now. makes sense when you explain it the way you did.
guess its old age catching up with me [LOL]. THANKS AGAIN