The propeller for the Gossamer Condor human-powered aircraft has \(D=12 \mathrm{ft}\) and rotates at \(N=107 \mathrm{rpm}\). The wing loading is \(0.4 \mathrm{lbf} / \mathrm{ft}^{2}\) of wing area, the drag is approximately \(6 \mathrm{lbf}\) at \(12 \mathrm{mph}\), the total weight is \(200 \mathrm{lbf}\), and the effective aspect ratio is 17. Estimate the dimensionless performance characteristics and efficiency of this propeller at cruise conditions. Assume the pilot expends 70 percent of maximum power at cruise. (See Reference [56] for more information on human-powered flight.)