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Old 03-31-2008, 07:32 PM
  #23  
maineflyer
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Default RE: Magic Hand 73" yak build thread

Rudder and Control Horns:
I finished up the tail group tonight by putting on the horns and the Rudder. This is pretty straight forward but there are no real directions with the plane so it is (shoot from the hip)... Sorta. I put a servo in the bay for the elevator and lined it up with the surface to get a point where the linkage wouldn't bind. It worked out to be about 1/2" from the inner edge of the flying surface. I then set the horns for the elevators so that the connection is directly over the hinge line. Due to the short length of the horn part of the washer was in the hinge line and restricted travel so I used the trusty Dremel tool to trim them. I am now getting 55+ degrees of travel both ways. I then trimmed the post to a reasonable length for the elevators and they were done other than sealing the hinge lines...
I then turned my attention to the rudder. I opened up the pull/pull exit holes in the fuse and stuck some carbon fiber rods in to see where they would intersect the rudder (note the 67" instructions say 135mm). I felt the rudder and this measurement is at the lowest end of the mounting block on mine ... thus the carbon fiber rods. I also ran a straight edge from the rudder servo bay to double check my measurement. It ended up being in the 155-160mm ballpark. I mounted the horn in the usual fashion. (always hardening the post holes with thin CA). Once the horns and posts were on I fit the rudder and walked the CA to the hinges. (I really wish this plane came with hinge points). This rudder is huge and I would feel much better with points. I then sealed the hinge line with some clear Monocote and the rudder tis done!!
Enjoy the pics!
Jeff
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