Conference vmszoo::rc

1663.0. "Servos" by WMOIS::WEIER (Keep those wings spinning!) Thu Apr 20 1995 11:31

         
                            JR SUPER SERVOS
    
             Following is an article I came across in K-factor regarding
         the new JR servos. These are the newest ultra-precision offering 
         from JR. They are the same size/weight as normal JR servos, and
         are offered in normal and "low-profile" versions. They have
         higher starting torque, and vitually zero deadband among other
         features and were developed primarily for Pattern and Heli 
         applications.
          
    
          Author: Bob Richards (K-Factor)
    
             I have heard from several sources regarding the performance
         of the new JR Super Servos. Everyone pretty much agrees that
         these are the best servos they have ever seen. They have two
         distinct disadvantages however. Number one is the cost, the
         street price is around $100 (EACH!) The second is that they pull 
         LOTS of current. Unlike normal servos, these guys do not buzz when 
         they are under a load, so you will not know by listening if a
         control surface is binding or not. I would recommend using an
         ammeter during setup to determine if any linkages are binding.
             Curtiss Youngblood outfitted a helicopter with these servos,
         and found that the battery was good for only a couple of flights.
         He decided that he really only needed the high performance on the
         "collective" and tailrotor controls, and went back to standard
         (4131) servos for everything else. I think we need to do the same 
         evaluation for our own purposes. I suspect the most benefit
         would be on the ailerons.