Review of reviews and world's work . sses arounda pulley at the other end of the track andruns back to the small car upon which theaeroplane is placed. When the weight falls,the machine is jerked forward with its pro-pellers running and is launched into the airat a speed of 28 miles an hour. Ordinarilythe machine can attain speed enough, whendriven along the rail by its propellers alone,to rise when the end is reached, and in oneinstance last spring, in Italy, Wilbur Wrightstarted on his runners on the wet grass. Thebrothers prefer skids and the starting rail inplace of wheels on account of th
Review of reviews and world's work . sses arounda pulley at the other end of the track andruns back to the small car upon which theaeroplane is placed. When the weight falls,the machine is jerked forward with its pro-pellers running and is launched into the airat a speed of 28 miles an hour. Ordinarilythe machine can attain speed enough, whendriven along the rail by its propellers alone,to rise when the end is reached, and in oneinstance last spring, in Italy, Wilbur Wrightstarted on his runners on the wet grass. Thebrothers prefer skids and the starting rail inplace of wheels on account of the possibilityof alighting upon rough ground withoutdamage. Eventualy they will probablv beable to start ofiF the ground on skids withoutthe necessity of a starting rail. The use of two slow-speed propellers offairly large diameter is one of the reasons forthe efficiency of the Wright machine, theother chief reason beine the curve of the sur-faces of the planes. This curve Is very nearlythe arc of a circle and Is not of the parabolic. END VIi:W OF THE CUkPISS RACER. (Showing balancing plane on the center of thefront upright and the skid on under side of thelower plane. This illustration gives a good idea ofthe curve of the planes.) shape which is generally used and which hasbeen found to produce great lifting planes are constructed of two mainframes, the outer ends of which detach fromthe center part. Light ribs are run aboveand below these frames and are heldapart by blocks placed at intervals. for-ward ends of the ribs are fastened to the frontedge of each frame, while behind the rearedge, which they overlap about 18 inches, theribs are secured together and slotted to re-ceive a wire which passes around them andover which the cloth is stretched. CURVE OF THE PLANES. The covering of the ribs, both top and bot-tom, presents a smooth surface for the air totravel over and has been found to be moreefficient than the other system used by Cur-tiss, shown in No. 5, pag
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