Does anyone know the size of prop for a 1970 43 ft columbia, mark III with a 4108 perkins 50 hp diesel . I cant seem to get the right size prop, 22,2oo lbs displacement, any help , thanks. Norm s/v ARAWAK II
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I don't know! but here are the results from
another web site. http://boatdiesel.com/Forums/Index.cfm?cfapp=6&Forum_ID=81&SearchKey= -------------------------------------------------------------------------------- RESULTS DISPLACEMENT HULL Hull Speed: 8.3 kts. Power Required: 43.7 shp. MAX PERFORMANCE Available Power: 48.5 SAE hp ( 36.2 kW) @ 3000 RPM Power Used: 44 SAE hp ( 32.5 kW) @ 2,896 RPM Max Speed: 8.3 kts Fuel: 2.6 US Gall/Hr (typical) CRUISING PERFORMANCE Cruising Power: 28 SAE hp ( 20.9 kW) @ 2500 RPM Cruising Speed: 7.1 kts Fuel: 2 US Gall/Hr (typical) RECOMMENDED PROPELLER Diameter: 17.0 in. Pitch: 10.6 in. Blades: 3 Cupped: No Increasing the transmission ratio will improve prop efficiency. ALTERNATIVE GEAR/PROP COMBINATIONS Gear Ratio Shaft RPM Dia. Pitch 2 1500 16 11 2.2 1364 17 12 2.4 1250 18 13 2.6 1154 19 14 2.8 1071 20 15 This is from Boatdiesel.com
another web site. http://boatdiesel.com/Forums/Index.cfm?cfapp=6&Forum_ID=81&SearchKey= -------------------------------------------------------------------------------- RESULTS DISPLACEMENT HULL Hull Speed: 8.3 kts. Power Required: 43.7 shp. MAX PERFORMANCE Available Power: 48.5 SAE hp ( 36.2 kW) @ 3000 RPM Power Used: 44 SAE hp ( 32.5 kW) @ 2,896 RPM Max Speed: 8.3 kts Fuel: 2.6 US Gall/Hr (typical) CRUISING PERFORMANCE Cruising Power: 28 SAE hp ( 20.9 kW) @ 2500 RPM Cruising Speed: 7.1 kts Fuel: 2 US Gall/Hr (typical) RECOMMENDED PROPELLER Diameter: 17.0 in. Pitch: 10.6 in. Blades: 3 Cupped: No Increasing the transmission ratio will improve prop efficiency. ALTERNATIVE GEAR/PROP COMBINATIONS Gear Ratio Shaft RPM Dia. Pitch 2 1500 16 11 2.2 1364 17 12 2.4 1250 18 13 2.6 1154 19 14 2.8 1071 20 15 This is from Boatdiesel.com
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