On the optimum diameter problem of3 to 5 blade B-propellers, the new diagrams are compared with the old ones.
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AP / Nathan Bilow随着背景红叶，一组桨其沉没的渔船在三叶湖岸边，维斯塔附近，周二美国科罗拉多州9月29日。
With the autumn foliage in the background, a group paddle their sinking fishing boat to shore at Cottonwood Lake, near Buena Vista, Colo. on Tuesday, Sept. 29.
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