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Hi John,
Thanks for the comments. My bino design doesn't require truss poles as I am using fully enclosed tubes. That 22" bino appears to have concrete reinforcing steel for trusses and seems to be poorly engineered.
I haven't been in contact with Dave Moorhouse but I learnt a few years ago, when I was just getting into this stuff, that Dave had sold his big bino. Clive and Mark have given me some good advice in the past. My aim has been to design with good stiffness, portability, lightness.
My OTA's are almost complete and I am about to fix the secondary spiders in place. They comprise two flat pieces of cf 1mm thick and triangular in shape. They are attached to an aluminium boss to which the secondary mount is attached. I am a bit nervous about getting them glued in the right place.
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