In a message dated 1/31/02 8:51:20 AM Eastern Standard Time, [EMAIL PROTECTED] writes:
One problem
is I only have about 2 inches from servo arm to control horn so I need
something compact.
A couple of quick "bones". Why don't typical zbend pliers make a bend that
is wide enough to fit conventional servo arms like JR and how come holes on
them are always undersized? Trying to bend my own has usually left me with
stressed or broken wire.
Yep I read the RCSD article so I know the answer :-)
First 'proper' geometry....
Servos should be even with the wing, not sunk in below the level of the skin.
The link at the servo arm should be as close to the screw as you can get away with. Any gear lash is accentuated the further away from the screw you hook up your linkage and REDUCE the servo's ability to micro recenter, also REDUCE the servo's torque. ALWAYS use your Tx's travel adjust for more travel, only then move up a hole on the servo arm. 99% of the time, the second hole from the screw will be plenty of travel for 90 degree flap.
On the surface horn: Use the 4th hole away from the surface. About double the height of the servo connection. This set up will give you those rock solid control surfaces you never seem to have but always blame on the servo gears. By connecting this way, gear lash is cut in half and the servo's leverage is increased.
So
Short at the servo long at the surface, and use the TX's abilities for more travel.
On Z bends, they are great for power guys and 'gliders' but stink on sailplanes. Sort of like a George Carlin joke.. military inteligence, digital servos and Z bends.
So what do you do when there isn't room for clevi? Like when you have the servos embeded in the Vtails.
You bend a 90 on each end... and hope the linkages don't fall out.. :-)
Nope you get some of those little pop on plastic or spring metal washers used on the bottom of those pushrod 'barrels' with the locking screw in the top. Those washer just push on to 1/16" wire. And they stay tight against the servo arm and surface horn so no push pull slop.
You can get those washers by themselves at the hobby shop, or Hobby Lobby.
Gordy
