Quote:
Originally Posted by jenchris
2.4 metre lengths give you exactly 9.91sq metres the inner radius is ~3 metres and the outer radius is 4 metres
I can supply a cad drawing I did if you need details.
Getting to zenith would mean a slight offset of the pier (or rather the axis of the OTA) from the centre of the obs,unless you construct it and then cut out the centre after inserting perlins leaving a pentanlge hole in the middle which can be covered with a rosette attached to the petal off the side to be used to view through
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I scaled my model up and without taking into account the thickness of timber or wall materials, a 2.4 metre strut-length will give you an inner radius of 3.3 and an outer of 4.1 or thereabouts. Although it would also give you a total floor area of about 10 sq metres, the effective area is really limited to the inner circle which also has an impact on the size of scope that can be used with this design - especially with a pier that has to be placed off-centre.
I'd be interested to see the CAD and continue the discussion about how to design the roof/roof opening. It seems to me that the rosette idea is worth developing but the moving of the roof could pose problems since the 5-point fixing plates that are used in this design are used not only at the apex but also on each of the wall-roof connection points so you'd have to cut them. Not pretty.
And I'm a bit doubtful about how well you could waterproof the rosette area. With a decent wind driving heavy rain and you'd have major water problems I think.
Peter