Kossuth County Advance from Algona, Iowa on December 10, 1931 · Page 9
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Kossuth County Advance from Algona, Iowa · Page 9

Algona, Iowa
Issue Date:
Thursday, December 10, 1931
Page 9
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•^^^^^rtldhM ' north ALGONA, IOWA, DECEMBER 10, 1931 16 Pages Number ND AUT ESAT *£" ,#S r, 1 ' •-a I-' FAILS OF IEW PLANE EXPLAINED iat makes thev autogiro fly? I can It rise straight in the air Descend straight to the ground? keeps the blades from folding |How Is the "windmill" started iatlng? These and ; a score of I questions are answered in this Be describing the mechanical Ires of Good News III, The pter and Tribune autogiro i comes to Algona Saturday af- lon. ' . ' glance at the machine and -the windmill device which it possible for .this airplane inti and take off, nearly vertl- mmediately arouses; curios- Its four blades drooping [ a central tripod above the ige give the plane a distlnc- fcppearance. •'/'.. ph blade hangs limp as a long fishpole. These blades are igs of the autogiro and cause question their strength to _.., the ton and a' half gross Ithe priro is designed, to carry. Blades Are Hinged. lmore peculiar Is the fact that lladea are hinged to their e'en- pub and if lifted at .the outer phile the plane is at rest" they I'lnge. up' until; the 1 ,tip of each I Is pointed up toward : the 8ky. "re Is no visible, device '_; tore- i -them from. folding W up in ' ; Yet they support three- f- at the weight, of, the ma' fin normal flight, and support ntire weight when incomes t down to a landing^ -Instead uctural bracftg, the blades faced by centrifugal force. f peculiar flexibility in .the ro- •Wings and the use of natural " to brace them Is the secret Vroachtne's almost .uncanny .rnance. It is the chief point lch it differs from the heji- f. ana other similar types In engineers have long .sought to find a practical air- ^Blades Hotate Freely. blade of the rotor is f orm- the same shape.^&s the lift KM a conventional airplane - hub, where the hinged the blades to the plane, Kited on ball bearings which j't to rotate free as the wheel v skate when the skate is its side, ally the rotor Is, started by ftjtoaft connected to the en- b a clutch similar to an auto- ',c|utch. As rotation begins fim gradually rlsi? from the .position they assume at EMter about 20 seconds they V80 revolutions a minute and I[W force becomes dominant, >;the Wades straight out like ' on t h e end of a taut b y three' tons of cen- the-roto^ blades can Close-up of Detail of Auto-giro jwr DONNER, BLITZEN, VIXEN AND COMET TO BRING SLEIGH HERE ,..P.raucer-and Dancer, Cupid-and Dasher have become so Tired" that Santa decided to leave them to rest. If they rest up so they can travel some of them may fly through the night to be with their comrades, but.Dbnner, Blitzen, Comet and Vixen are bringing the sleigh through at lightning speed. no longer hinge upward beyond a few degrees above the horizontal and they are in position to support the plane and it load. Although the plane has not yet moved it now has the flying speed the ordinary plane accumulates by a "long run on the ground, rlt is ready to take off. Goes Almost Stralg-lit Up. The pilot releases the clutch, which is something like putting an automobile in gear, and disengages the rotor drive shaft. At the same time he opens the engine wide. If the wind is blowing 20 miles an hour or more the giro takes oft instantly and climbs nearly vertically. If it is culm, the machine runs about 100 feet and then climbs at an angle of about 20 degrees. Ordinarily it will clear an obstacle 100 feet high at 280 feet from the starting point and c«mb at the rate of about 1,800 feet a minute. The moment the machine gets under way the rotation of the windmill is actuated by air currents and the engine has no further connection \vith it. The rotor turns clockwise when you are looking up at it and the machine is coming toward-you It holds steady at approximately 120 revolutions a minute. After the initial starting of the rotor, the engine, simply propels the plane while the rotor is turned by the air and supplies the lift loi fl Th* autogiro is fitted with a con- similar to the convei A single control stick comes up from the floor of the cockpit between the pilot's legs. Pulling back on the stick raises the elevators, which are small hinged surfaces on the tail of the machine, and noses, it upward in a climb. Pushing forward on the stick depresses the elevators and causes it to nose down. Moving the stick to either side regulates the ailerons for lateral or sidewise control. A rudder regulated by foot pedals trims the ship directionally. The rotor blades hinge up and down in flight. They also hinge fore and aft and are constantly adjusting themselves to an inherently stable condition. , i n flight the body of the machine is suspended from the rotor blades by centrifugal force holding the wings straight out and suspending the fuselage below. Kindles Sternly Mumps. This suspension gives the autogiro pendulum stability. The flexing of its wings tends to neutralize the erratic air forces and steadies the machine in bumpy air. When it comes to landing, the autogiro will glide' like the ordinary plane or it can be brought straight down from any height. It the engine fails or is shut off and the pilot lets go of all the controls the machine is designed to nose down slightly and glide to a normal ail- plane landing at about 20 miles an h °tTthe pilot shuts off the engine and pulls the Control stick well |£;? O '-[jjjiiji^^ ^-'^^^^jS^: f ^^^Jk^^ te-t--:-.'.--v/ -^ -iT, -- "- - ;~-i • •-«<--= |~- jyr ^^< >,. - '--^?;C-\'V.- : i-:|fe back the machine settles straight clown at 14 to 16 feet a second. In this maneuver the rotor acts as a parachute and the plane descends about parachute speed. About ten feet off the ground the air wash down from the rotor deflects up from the ground and forms a cushion of air which momentarily stays the descent so there is no landing shock. On the ground the pilot applies a brake to the rotor at the .hub to stop its rotation and the blades again droop limp on their hinges. Suspension cables extend from the nib of each blade checks them from drooping to the ground. Cables Swing Free In Air. Intel-bracing cnbles run from one Made to another and keep them evenly spaced at 90 degrees. In the air the suspension cables swing free except for short strips of rubber cord which take up the slack in the cables and prevent them from whipping. The Intel-bracing cables are connected to the blades with friction dampers to avoid interfering with their fore-and-aft hinging in flight. ' Bach rotor blade Is approximately 19 feet long from hub to tip. The overall diameter of the rotor is 37 feet and the lifting area of the four blades totals 11,075 square feet. Construction of each rotor blade consists of a, spar formed from three pieces of chrome nickel tubing. The three pieces are telescoped, welded and riveted together. The spar is two and one-eighth inches in diameter at the hub and tapers to a smaller diameter at the The leading edge and the tip of each rotor blade is covered by laminated wood. The remainder is covered with a special grade of cotton which is doped weather-tight and painted. Tripod Tips Backward. The tripod on which the rotor. Is mounted is formed by three struts of chrome molybnum steel and is mounted so that it tips back one and one-half degrees from the vertical and two and one-Half degrees to the left to counteract gyroscopic forces. ' On top of it' is mounted a cone to which the suspension cables are attached Below the cone and the fittings which attach the rotor blades is part of the starter mechanism. This includes a worm gear starter and a rotor brake. A)l of the fittings on the tripod except the supporting struts are chrome 'nickel Tautauk has offered to tell everyone interested about his reindeer and about his home in the North and will be glad to have the children or the grown-ups ask all the questions they want answered. Tautauk is a long way from home. He differs from the fathers you children know but he loves children and is anxious to help Santa Glaus give you children a good time. So ask him to tell you the tricks his reindeer play. How Vixen sometimes spills the toys, sometimes breaks them so some little boy or girl doesn't get the toy it wanted so badly. How she sometimes eats the ears from the dolls so that Santa has to wait another year before he can fulfill the wish of some dear little girl. Santa's reindeer love to play with the children and Santa wants each child to pat them and learn how thick iheir hair is and how well they are protected against the cold. The trip has been rough, so rough that at times Santa thought some of his reindeer would never stand the trip. Antlers have been knocked off, but thank goodness new antlers will grow again next year. Santa greets everyone and hopes to personally see everyone in town when he arrives. Santa hopes that every child from miles around wil come to see him. Santa would like to visit every child at its home 'but time doesn't' permit him to do this and he will be located some central place in town most of the time and doesn't want a single child to go home without telling him just what it wants. This should be the most enjoyable Christmas you have ever experienced. Santa Glaus will do everything he can to make everyone happy. The good people have decorated the city, secured large new stocks of the finest Christmas merchandise for this b(?qasion and will have extra help in all the stores to see that everyone gets prompt and courteous service. "' Pilot Gaschet Ready to Go | VTOTICE THE detail of the hub that holds the giro blades. ^ The narrowness of the blades will be surprising ' to| those accustomed to the airplane. These Wades are built similar to airplane wings. Auto-giro Is Inspected Every Day ''^P^^Sk ^^^ 5 v x^*' < , •™!«^rg«f!Sgffl!!81!T' -*- • f <&,> •"•: L, ——-T^^- t f 1 *>T*B f ^^7 " '' ' *«ML!f tj.Vj*-': f.,^. - ^w» B., '*t!^,A&l2^S-sj^ste^i'.. ' Ei^'^i^ e fuselage of the autogiro is built UP- of steel tubing and employs the square tube longerons characteristic of Pitcairn construction. TwoWn cockpits are provided. The rear cockpit contains the pilot's control and » complete set »t instruments for checking the engine, and rotor, and for navigation. The foi-wajrd cockpit seats 0 »e passenger. The 'engtae 1» mounted Ijj,the adjustable, is normally pitched at il 'degrees. The fuel tanks are mounted aft of the engine in the fuselage. The main tank is oh the bottom of the fuselage and hojds 30 gallons. To clear the v drooping rotor blades when they are idling or at rest, the rudder and vertical stabilizer at the back of the fuselage is lower than on an ordinarily plane. Fixed Wins Qirtj 85 Feet. Fastened tp each side at the bottom of the fuselage and just aft o* the engine is a small fixed wing with 8n overall span of <25 feet. Its chief function is to carry the | ailerons for lateral control and. upturned stabilizers which the mounted on the wing tips- The toed wing also supplies a portion of tf»e lift. The «41econs run the fi?Jl length, of the fixed wing at the trailing edge. Suspended from $»Js $stag te an •unusual tending .gejy. sjri fal- dflSiTB ,»¥«», *er m -' 2001 f COMPARATIVE ARPA REQUIRE FpR SAFE lANPlNg OF AU i -i ikVllv^VMSl.l-JJdfcfe^^^.i J eC l &^AWMt'W8t«a^

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