The two induction factors across the blade, from the fixed point

The axial and angular induction factors at each radius, where the momentum account of an annulus and the blade-element account of it agree. The disc supplies the first of those two statements and has nothing at all to say about the second: it has no blades, no chord and no section, and cannot form the force the sections produce.

14 essays call circulation-ledger. The drawing above is what it returns with no arguments at all; every call below passes it something, because a placement that passes nothing draws whichever member of the family the generator happens to default to rather than the one its essay argues about.

It is also the blast radius. Changing circulation-ledger changes every figure listed here at once, and on this site it may change what they assert as well as what they show — which is what has to be rebuilt and looked at before the change is believed.