|
My mirrors are in transit via Germany and should arrive thursday.
I've drawn up some plans on two options, one a serrurier truss similar to Brent and Rolf's designs with changes, and the other similar to an RC truss OTA.
Since its an F4 and overall length will be short, I could get away with the RC design as midpoint would be quite close to the mirror and sag not that pronounced, that'll reduce stress on the central section as well and make the lower section very rigid. That will in turn keep the upper section centred rigidly.
I'll have to calculate the mid point and then decide.
Haven't decided on the secondary supports as yet.
But will be starting build of the mirror cell and upper section this week.
I might also change the central support from a square to an octagon like the officiane stellare ultraRC series. that changes the angle of the truss to less than 90deg from the light path and should reduce flexure of the upper and lower sections as it resembles a cone. but issue with that is the trusses need to have a ball and socket end due to the varying angles.
|