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[ATM] wire spiders

I have been searching for information on the internet about the angle
between the wires of a wire spider. I found some postings, including one of
Mel Bartels and one of Nils Olof Carlin, telling there has to be 'some'
angle, but not how large that should be. Nils Olof, pointing to bike wheels
suggests, if I understand him well, that the angle doesn't need to be large.

I want to use Mel's crossing system on the trilateral 20 incher I am
building at the moment. When I make the central hub and the side bars 150 mm
(6") long, the angle between wires at the crossing point will be about 35
degrees, the angle between hub (or side bars) and wires about 27 degrees.

Is this the way to go, or should the angle still be larger? Or is this
overkill and is a smaller angle also OK?


Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/

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