Propellers from the tug John Purves

Propellers from the tug John Purves (HM1OSF)

Location: Sturgeon Bay, WI 54235 Door County
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Country: United States of America
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N 44° 49.827', W 87° 22.96'

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4-blade, 76 in. diameter

These two propellers were removed from the John Purves during her renovation in 2007 and wrapped with rope for display.
They were originally installed in 1957 when the vessel was converted from steam to diesel power at the Sturgeon Bay Shipbuilding & Dry Dock Company. They replaced the steam equipment with two 900 hp 12-cylinder General Motors engines and the twin screws seen here.
The pitted condition of the propeller's surface was caused by a phenomenon known as cavitation. This is the formation of vapor bubbles around the spinning propeller. The water pressure is lower than the vapor bubbles, effectively producing a shock wave adversely effecting the propellers' surface.
Marker ConditionNo reports yet
Date Added Friday, October 23rd, 2015 at 5:01pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)16T E 469751 N 4964187
Decimal Degrees44.83045000, -87.38266667
Degrees and Decimal MinutesN 44° 49.827', W 87° 22.96'
Degrees, Minutes and Seconds44° 49' 49.62" N, 87° 22' 57.6" W
Driving DirectionsGoogle Maps
Area Code(s)920
Closest Postal AddressAt or near 120 N Madison Ave, Sturgeon Bay WI 54235, US
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