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Old 12-27-2007, 05:05 PM   #5 (permalink)
ddlstang
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Default Re: PP: Hitec Servo Programming Fixture and Motor Thrust Shims

Bobnj ;

First thing is to program your servos. You can set whatever end points you want ( 45' or 65' ) or wahtever you like. The longer the throw on the servo the more resolution you will gain out of it also - so I like to run it up to 65'. You dont get that much more actual throw advantage after a certain point but you gain resolution. When I set up the servos I will set each set together ( ie: left wing , rt wing, rudder ). I will set the "master" servo deadband width at "1" and the other servos on that wing at "2". This allows the #2 and #3 servos to have a little more "digital" play in them so they are not fighting.

After the servos are set up set up your control surfaces. Set the control horns up evenly, I measure from the hinge line to the control horn pivot point and make them all the same. I usally just square them for general use - 1" servo arm = 1" horn, or if you are IMAC only you may want to under drive it for more resolution.

After that I install the servos, trying to make sure they are as square to the hinge line as possible. next put in the control rod and plug in the #1 servo and adjust the rod until the control surface is flush or neutral ( remember the servo center is EXACTLY 90' ). Next put in the #2 servo and adjust the rod until it stops humming, and repeat for the other servos.

Hangar 9 makes servo amp meter that you plug in which works well on finding centers and can be used in conjunction with this. So I hav'nt had to make any other adjustments after the initial set-up.

If anyone has any other inputs please respond.
Thanks
Dale Lathem
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