For larger engines Michigan'S "MICHLOY" bronze is used. High in strength non-corrosive and ductile enough not to bend from every little impact. Here we have the best propeller aluminum obtainable. For small motors we recommend aluminum propeuers due to the weight factor. THIRD precise accuracy good design and correct size are of little use if not supplemented with material that will not fail. May we emphasize however that the specific recommendations are not all theory! In fact we maintain a test crew who operate 1 months of the year actually checking propellers and their results under all conditions as described on pages 4 and 5. In recommending various propellers for certain engines with different hulls and consideration has been given to the gear ratio of the lower unit its contour engine's power RPM range etc. That is why for the larger motors especially we offer a range of sizes and styles. Due to great variations in hulls and condi-~ rions however the standard propeller oftentimes is found not too good or even entirely wrong for the job. In many cases this propeller is entirely sads- factory. In the following tables you will note we offer standard propellers for almost every motor that is they are similar to the original equipment in shape and dimensions.
SECONDLY a propeller must be of correct size and design FOR THE BOAT LOAD and SERVICE. Supplementing our unequalled equipment we have 45 years of experience and an organization of skilled craftsmen and propulsion engineers whose abilities are directed solely to propellers. Space does not per mit going into detail here but on request literature will be sent descriptive of Michigan's M P method of propeller manufacture. They are manufactured under our Machined-Pitch method of manufacture by machines especially designed for on~ purpose only - to make propellers. Michigan propellers are accurate in every detail. cannot operate without vibration and maximum efficiency. Certainly a propeller that is not perfect in pitch balance machining blade uniformity indexing etc. WHAT GOOD MAKES A PROPELLER? FIRST a propeller must be accurate. Obviously the propeller of an outboard or an inboard is of most critical importance and this is the reason why many manufacturers of outboard engines and inboard boats leave their propeller problems in the hands of propulsion experts - usually the Michigan Wheel Company. Outboarding is a grand sport and we want to help everyone to get as much pleasure from his particular outfit as possible. Due to the inexperience of many outboard owners lack of really reliahle information on properly «setting up" a unit we have in the following pages gone to considerable length in attempting to be of assistance along these lines. 2 The KEY TO BETTER OUTBOARD PERFORMANCE The contents of this booklet constitute a means whereby most every owner of an outboard outfit can determine whether he is obtaining maximum pleasure performance and service from his unit.
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