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› servo problem on new build
01-03-2010 03:20 AM  7 years agoPost 1
tcprogrammer

rrNovice

Worcester, MA

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Hello Everyone, I got a Protos for Christmas, and I'm starting the build but I have run into a problem with the servos for cyclic. I got DS3517's after I saw that a number of folks here and on helifreak were using them with success on the Protos. I also saw that the stock arms are not long enough, so I picked up the Du Bro arms as well which are longer and have a 16mm hole.

The problem I am having is that I am not getting enough clearance from the bearing block. The bolt that holds on the ball link comes in contact with the bearing block. Can anyone who built a Protos with DS3517 cyclic servos recommend a solution?

Thanks, Aaron

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01-03-2010 02:15 PM  7 years agoPost 2
Shawn Behrens

rrApprentice

DEEP IN THE BOG

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The servo horns that come with JR 8717 servos work with better clearance. Even with these I did have to very slightly remove some material from the inside of the bearing block to clear the nut on the back of the servo horn. These seem to be great servos for me so far but mounting them in the protos is a bit fiddley.

shawn

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01-03-2010 07:51 PM  7 years agoPost 3
tcprogrammer

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Worcester, MA

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thanks shawn. Following someone's advice, I found out that if I used the MSH "B" sized servo mount adapters and cut them in half, it would work instead of the rubber grommets that came with the servos. This gives enough space back for the pitch and aileron servos to clear the frame without and further modification. The elevator servo still hits the bolt, but I am going to trim that off with a dremel and then the nut should clear. Its REAL close though. I agree these are great servos and I'm glad I can make it work but it is real fiddly!

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› servo problem on new build
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