Hi, Mike,
Thought I posted a reply when you originally posted this, but it seems to have got lost on the ether somewhere!
The 3+1 uses Bonner Digimite servos, but looking at your photos, yours seem to have been modified by cutting the mounting lugs off! This was presumably to get them to fit in a pylon racer, which was the original intended function of the 3+1 sets.
Here's a pic of one of my Bonner servos, with a JR for size comparison:
DSCF2138 by
Peter Christy, on Flickr
The Skyleader looked very much like the F&M 3+1, and I suspect was a "carbon copy"!
The other "odd" servo bears a resemblance to the Climax servos. I've never held one, only remember the ads for them. The Climax servos were originally for relay equipped reed radios, and should have been quite small. I think they eventually did a relayless version, and I know they did a feedback version because they produced a complete digital system for a short while. I wonder if that servo is a home made modification of a Climax reed servo? Difficult to tell without knowing the size of both.
I never had an issue with the Bonner sticks. Mind you, it was my first proportional so I didn't have anything to compare them with! Most of those early sets had very strong springs - even my Sprengbrook - and I now find it quite hard to get the sticks in modern transmitters hard enough for my liking!
The one oddity of the Bonner sticks was that the trim moved just the centre position rather than move the whole range. In other words, the end points remained the same. However, this was necessary with the Digimite servos, as being linear output, moving the end points would cause them to stall at one end or the other. These were powerful servos - something like 8lbs thrust, when new! Hitting the end stop could cause some serious damage!
See you at Ponty!
--
Pete
