Show What the World is SEEN BY POPULAR MECHANICS z Aero Propeller Shaft Installations S D T DESIGNERS and builders of aero- aero propeller driven driven r-driven craft such as sleds and boats are often handicapped by the lack of a suitable but cheap method of installing the propeller shaft If advantage is is taken of standard standard standard stan stan- dard automobile parts however er a v ery very ery neat and coupled close-coupled arrangement which will give give good service service and End operate efficiently can be made mads at a minimum of cost and labor Front and wheel rear-wheel hubs from a alight alight alight light car are arc used to form the main mam parts of the installation together with witha a special shaft and a couple of sprockets The shaft design is is a corn com combination of that of a front axle spindle and the out outer r end of a rear axle spindle or chaft Between the two parts parti is is a a. pad or shoulder for th the tho seat of the driven en sprocket The shaft must be carefully and accurately turned from a n solid piece of good od machinery steel the rear end i is JB I turned and threaded to the same di dimensions di- di I as 05 the wheel front spindle of the car from which th the the- hub hubis is taken and tho the seats for the ball races must be held very carefully to size size The front end is is turned to fit the wheel rear-wheel hub threaded for or the nut and key key- seated The seat eat for the sprocket may then be turned and the thread for the locknut cut The front wheel hub minus minus the outer flange is is then slipped on the ball baIl cones adjusted so as 88 to allow the shaft to torun run run freely without any shake and the tie locknut tightened and fasten- fasten en with a cotter pm pin The regular hub GREASE CAVITY REAR HUl 1 COiL Fiol S 4 c r J-r 17 II 0 0 0 r I I PiPE I L V.-J V. GuRD cap is is used filled with good rood grease just as in m the car The hub that carries the propeller is ia a wheel rear-wheel hub as stated above and it is la fitted with a ft second flange made mado out of hub which is is machined away until a flange flango is le left t that will pass PIUS over the turned portion of the hub proper The prop propeller rop lier hub is drawn up on the tho tapered portion of the shaft ahart as RS inthe in m tho the car and locked by means of a anut anut anut nut washer and cotter pin pin The propeller propeller propeller pro pro- peller is is clamped between the flanges by six six through bolts bolte of ofin in diameter the sliding eliding flange allowing for a Yi wide variation in m the thickness of oC propeller hubs A hub cap is is screwed on the forward side aide of tho the hub to present a neat finished appearance Tho The key that holds the should be large and set deeply ac it carries carries all aU the motor torque I Two heavy wooden uprights meet meat ing lug at the tho form an inverted vee ee are bolted to the sills of the frame and straddle the body of the wheel front-wheel hub as shown shO Four in bolts bolth hold the tops of the uprights upright firmly finnly to the hub Angular braces made of 2 pipe are also fitted the ends being flattened and drilled for the bolts boIts The I propeller should be balanced before installation to insure insure v running The hub cap should be filled with good grease to insure perfect I IQ lubrication and refilled at nt frequent in intervals |