So which way do they curve then?
If you mean downwards when stationary, then I think that'll be due to the flexibility in the structure. The droop decreases when they are rotating due to centrifugal force, as far as I know (I stand to be corrected if that's wrong). I don't have bags of experience, but if I found them curving any other way I think I'd get the bus (and I hate buses).
Or, have I missed a very obvious rotary joke?
