Thanks for pointing it out, but I'm not seeing much there.
Quote:
It is almost impossible to
calculate the effect of these fittings, consequently only
rough approximations can be made.
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True that.
Quote:
All right, now we have the drag force on the wires
and struts but, to make good use of this knowledge, we
should equate this to the amount of power required to
overcome this resistance. To put it another way
"how much hp is this going to cost me?"
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From F=kDLV^2 there's a hop. skip and a jump to HP = kDLV^3/375 with no consideration to interference drag, area rule, integration of composite shapes, etc.