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Shaft size

When designing a propulsion system, the size of the shaft becomes an important consideration. Yes, there are formulas that are used:

Shaft diameter formula

D=(321000*SHP*SF/St *RPM)^ .33

Where

D = shaft diameter ,inches

SHP = Shaft horsepower

SF =Safety factor ( 3 for yachts , 8 for heavy commercial use)

St =Yield strength in torsional shear ,in PSI

RPM = Revolutions per minute of propeller shaft

Shaft bearing spacing formula

L = ( 3.21 * D/ RPM)^0.5 * ( E/ Dens)^0.25

Where

L = Distance between bearings ,in feetD = Shaft diameter ,in inches

RPM = Propeller revolution per minuteE = modulus of elasticity of shaft ,in PSI

Dens= Density of material in pounds per cubic inche.

SHAFT MATERIAL CHARACTERISTICS

Shaft material                                  Yield strength                              modulus                       densitiy lb/ci.in

Stainless steel 304                                         20000                                        28 000 000                                 0.286

Aquamet 17                                                     70000                                         28 500 000                                 0.284

Aquamet 18                                                     60000                                        28 800 000                                 0.281

Aquamet 22                                                    70000                                         28 000 000                                 0.285

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More Stories By John Miele

I am currently Sales and Marketing Manager, Asia / Pacific for France Helices. Created in 1977 by Paul BEZZI, FRANCE HELICES is today an international company. French marine propulsion leader, FRANCE HELICES is also one of the international leaders. Research and development are a very important part of FRANCE HELICES program, the CAD's department is equipped with the latest computer technology, using most up to date programs. Our engineers and technicians determine from the customers specifications and designs, the type of propulsion system to suit the boat's application. They can also advise on the ideal choice of power and optimum gearbox ratio to obtain the maximum thrust. There are many FRANCE HELICES' inovations and patents such as Surface Drive System (SDS) which enable boats to obtain very high speed with excellent handling capabilities and high quality Controllable Pitch Propeller systems (CPP) for both professional use and pleasure application. The constant research using cavitation tunnel testing, guarantees high efficient propeller blade shape for our customers. More than 20 000 propellers per year are manufactured by FRANCE HELICES workshops. In all sizes from small sailing boats to large fishing vessels to navy boats or mega yachts. The FRANCE HELICES workshops are equipped with modern foundries capable of casting propellers up to 3.5 tons in NiBrAl. They are also equipped with CNC milling machines and CNC lathe machines. FRANCE HELICES has four sites which cover the complete range of production. The development of FRANCE HELICES, supported by shareholders places our company as a leader in the international market and insures a constant development, worldwide, in order to be close to the end user.

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