t K in (10) but, on the contrary, will keep this, term in the expression of the resistance W, where it preponderates. Another simplification consists in assuming for each wing one single vortex-screw passing through the centers of gravity of the different sections, the intensity of which in each… … where w is the component of the speed v° following the normal to the speed 7 and the span of the wing is comprised between x = a and x = b. These formulas only hold good when w is small in relation to V; now this involves the annulling of 7~ at the extremities of the lifting screw, for otherwise…
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