Show PERFECTING A GREAT MACHINE Th coming of oC Colonel Charles A. A Lindbergh to Utah is renewing in in- interest interest terest in the mechanism ot of the Spirit ot of St. St Louis One of oC the experts in describing the airplane says sas The engine is a Wright Whirl Whirlwind Whirlwind Whirlwind wind wind All the tanks are ot of These engines are aver aver- averaging averaging aging agin in excess ot of 50 hours be be- between I tween overhauls over auls Expressed in automobile terms this means that the he engine travels ravels approximately miles before beCore requiring at- at The ultimate life lICe ot of the engine is approximately 2000 hours which expressed in automobile terms means an ultimate life liCe of oC approximately miles This greatly figure figure greatly exceeds the life lICe of oC the average automobile Colonel Lindbergh made approximately 10 miles per gallon on his flight to Paris j I The gasoline tanks were design design- designed ed to have havo a capacity of 45 gal gal- Ions ons In the fuselage are two tanks one gallon in the center ot of the fuselage and another 88 gallon 88 gallon In front of oC it in the tho engine mount In n the wing are three smaller tanks with a volume of gallons giving ing ng a a. total capacity ot of gallons To fo the rear of oC the engine acting as asa asa asa a firewall firewall is a twenty five gallon oil tank Leads from all fuel tanks are arc brought to a central manifold 10 lo located lo located on the instrument board Here Hero a series of valves are ar are arranged ar- ar arranged ranged controlling each tank and the tho feed to the carburetor so that the pilot can use any any or all tanks The cockpit Is entirely enclosed and is placed to the rear ot of all fuel tanks for safety and balance Due Duo Duoto to the fact that the fuel tanks ob ob- obscure ob- ob obscure I I all vision directly forward I a periscope was arranged to pro pro- provide provide vide vision ahead This periscope consists of oC two o 45 degree mirrors suitably mounted and reflects I the mage on the instrument hoard board l dl-l dl reedy in fn front of oC the pilot The periscope can be extended on the left eft hand side ot of f the fuselage at about or can be drawn In n out ot of the way Additional vis via viability is obtained through windows at each side ot of the fuselage and by bya a skylight in n the wing An air scoop provides fresh Cresh air in the cockpit at all times The engine being of the four- four stroke cycle type there are nine explosions for each two revolutions ot of the crankshaft Ignition is obtained by two In in- Independent independent dependent systems of magnetos Each magneto magn to may be operated in in- independently independently dependently since they fire indi indi- individual individual individual vidual sets of plugs in each der In other words both mag mag- magnetos magnetos netos can be used at one time orthey or orthey orthey they can be used individually When only one is used used there is a single spark plug firing in each cylinder Lubrication is provided by a pres pres- pressure pressure pressure sure pump which carries the oil Into the rear end of oC the hollow crankshaft from which point it is distributed to to all nil bearings under pressure The excess oil running through to the front end of the crankshaft is s collected there and returned to the rear ot of the crankshaft crank crank- crankshaft shaft shall by means of oC one suction pump A second suction auction pump car car- carries carries ries rles this returned oil from rom the rear section of the crankshaft crankshaft to the tho oil tank passing through an oil strain strain- strainer er where matter matler picked up In the engine is strained out The Tho only two parts ot of the engine eugino not lubricated under pressure are are the he cylinder walls and the wrist pins These are aro lubricated by a limited amount of oC oil spray which Is s permitted to lly Ily out of oC the t e crank crank- shaft in the form ot of a spray and within the crankcase The Th The oil used for cylinder lubrication cation and nd wrist pin ln lubrication is that burned by the engine The remaining oil is used over and over through the complete circulation system made up ot of the t e oil storage tank and the engine itself The carburetor is really three carburetors in one Each of the tho in In- individual carburetors supplies s a mixture mix mu- mixture ture of oC air and gasoline to three cylinders The air cooling system really means m ans that the heat of oC combustion is transferred directly from the cylinder to the atmosphere This I is accomplished by means of oC fins the cylinder clInder and cyl cyl- cylinder cylinder inder head This method eliminates the use ot of cooling water and the fragile radiator common to auto auto- automobiles automobiles automobiles mobiles and older type aviation engines It results in large largo de de- decrease decrease crease in weight and great Increase In engine reliability With American skilled mechanics operating co-operating with the inventive genius ot of the land working to de de- develop develop the gas engine soon the day should come when in both airplane and automobile the engine will be beas beas beas as near perfect as man can make male it Many of lC the improvements made In propelling airplanes will help to give ghe the automobile indus industry try better belter engine carburetor mag mag- magneto magneto magneto neto and lubrication |