The Bismarck Tribune Newspaper, July 9, 1931, Page 10

= WHIRLING BLADES — . | ROTATED BY |*DROOR” AIR REACTIONS [caBLes - Safety At Slow Speed [PROPELLOR FoR] i | FORWARD 4 | MOTION ONLY J i An autogiro fairly lolling innovations indicated by whict have been achieved. “Dro chine is at rest. Juan de the principle of autoro r lades from falling when ma- msert), Spanish inventor, discovered the modern autogiro is the result. AUTOGIRO WAS BORN FROM WRECK OF BOMBING PLANE Air Machine Which Can Travel ter of gravity so that, when the pow- er driving the conventional propeller Slowly Results from Span- | in the nose of the ship is shut off, an iard's Discovery | autogiro will assume a natural gliding langle. — |. Each blade is hinged two ways, for Philadelphia, July 9—(—A com-j limited up and down and fore and parative newcomer in aviation, the|aft movement. “Droop” cables keep autogiro, was born from the wreck of| them from falling when the machine an airplane. \is at rest on the ground. Its elevation to public interest is| As the blades rotate in flight they recent, heralded by production of two|cone slightly upwards, assuming a and three-place models for the pri-| balanced position between their tend- vate and sport flier, delivery of one to,ency from centrifugal force to be the navy for military experiment, and | straight out herizontally and the lift plans for autogiro cabin planes and/| forces acting to pull them upward. flying boats abroad. | Hinging Prevents Tipping Yet its history reaches to 1918! If it were not for hinging, the ma- when @ Spanish inventor, Juan de la|chine would tip in flight as the lift Cierva, saw a three-engine bomber forces on an advancing blade would he had designed for his nation’s air|be greater because the airspeed force wrecked when its pilot flew it’ would be greater from forward rove- too slowly close to the ground. |ment, both of blade and autogiro, He set about to discover an entire-| while a receding blade would be go- ly new principle of flight by which|ing “downwind” and be less effec- machines would be capable of flying | tive. slowly and safely as well as fast and} The hinges allow each advancing far. |blade to rise automatically, in effect Bugbear Harnessed {causing less lift, while each blade He found it in autorotation, con-|in receding descends and causes verting to a useful purpose what al-j greater lift. ways had been a bugbear to heavier-| In vertical descent the lift forces than-air craft in the form of the!on each blade are equal. deadly spin—the very thing that end-| The small fixed wings of the auto- ed the days of his bomber. |giro, with upturned tips, serve main- In place of the fixed wings of the|ly to provide lateral stability and ordinary airplane, he adopted a sys-|carry the ailerons and the wide un- tem of rotating wings, the power for | dercarriage. their rotation to be taken from the|— eas air reaction on the wings themselves. | ¢——-__—___________ first full size ship, built in 19: i i had two sets of two blades each, | Stickler Solution | tated horizontally in opposite direc- | °— . - tions. It was unsuccessful, and it was not until 1923, with a rotor of four blades, that the first autogiro flight was made. Paddles Provide Lift Where a fixed wing airplane de- rives its lift from high forward speed the autogiro derives 80 per cent of its lift in flight and 100 per cent in vertical descent from its whirling “paddles.” This “buoyancy” enables the craft to take off with a short run and to land “on its own shadow.” The “paddies” are long, narrow blades shaped in cross section 1 an airplane wing. They are whirled by the air reactions upon them, never receiving any power from the engine in flight. The engine serves only to drive the propeller for forward s of the machine and is connected with the “paddles” only on the ground to set them to whirling to a speed of 120-150 revolutions a minute. The bladed rotor system is mounted on a hub set a little behind the cen- The above diagram es drawn m per- spective and illustrates how four tnangles can be made from six matches. To ex- plain how the problem stands, after be ing worked, the three black matches are flat on the ground and the three white ones are standing in the air, m pyramid shape. Thus there 1s a triangle on the bottom, and one on each side of the pyramid SIDEGLANCES - - - By George Clark | ELL~ HENRIETTA* WELL» NW sue BLow NAS BEEN UNCLE BIM STRUCK - CLOSED IN ON THE FACTORY- ' ‘Tom IS ouT- BIMS STAFF OF gant READY ANDY LOST HIS $250, 000. AND SCOOGE—H DON'T GO NEAR fy HIS OFFICE - HE HELD ON ‘To HIS. HALF MILLION DOLLARS WORTH OF STOCK~ AND IS STILL HOLDING I WALT, YOU'RE SURI NOU HAVE YOuR NICKETS AND YouR LETTERS OF CREDIT = AND PASSPORTS AND > EVERYTHING & LANDED SAFELY AT NR. KINGSTON'S SUMMER PLACE, ON olaKe PARADISE... on MIRK , THE PILOT, TAKES OFF AGAIN IMMEDIATELY ¢ 0 % MOM’N POP ATS A LET FROM AUNT HANNAH ! Gosh, | GoTTA ADMIT 1'4 VVE LOST ~ T'S ALL OVER NOWe- ) HAVE LOSY THE FACTORY = MY BUSINESS GONE- ALL PRESENT, PHNLLS. 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