Thanks for posting that Orion. I tried to look at the case for your 1.1" thick X 24" primary but it won't accept the numbers. The next version will allow evaluating a sling not on the centre of gravity so it may be very uesfull for you to evaluate your sling placement tolerances for your telescope.
I'd add that the choice and end result for `cable sling' is essentially the same as a normal sling edge support. A cable sling is usually chosen for a large thin mirror as it is easier to position exactly at the mirror edges Center of Gravity than a normal wide cloth/ nylon sling.
This calculator is of use not only for telescope makers, but anyone who wants to evaluate the surface flexure due to edge supports ,with optical axis at the horizen, of any commercail mirror and mounting system. Just divide the Nanometre out put figure by 550
to get a figure for surface flexure in fractions of a wave.
I'm greatful for this calculator as it can demonstrate what I have known for a long time qualitatively through practical experience. While 2" thick sling mounted mirrors may before as excellent `ballast' to keep the balance point low in a modern truss Dobsonian, there is a price to pay in thermal behaviour, and thinner 1.6" thick mirrors up to 24" do still perform as superbly at the eyepiece in regard to image quality provided the mirror is excellent in the first place. The views do not suddenly fall apart from astigmatism or `potato chipping' as modern commercially driven folklore might suggest
