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Log Boom Drag Measurement at Sea
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Measurements of the drag on a typical (52-section) log boom were made under calm conditions at sea. The drag coefficient based on planform area is essentially independent of Reynolds number over typical operating conditions, cD = 0.0083 + 0.0006. Engineering calculations suggest that the log boom drag is caused primarily by skin friction drag and that wake drag is slightly less important; wave drag is entirely insignificant. A small-scale (4-section) log boom was constructed to test the influence of log arrangement within the boom on boom drag. Neither aligning the front row of bundles transversely nor covering boom sections with an underwater shroud had a significant impact on the boom drag.
The Society of Naval Architects and Marine Engineers
Title: Log Boom Drag Measurement at Sea
Description:
Measurements of the drag on a typical (52-section) log boom were made under calm conditions at sea.
The drag coefficient based on planform area is essentially independent of Reynolds number over typical operating conditions, cD = 0.
0083 + 0.
0006.
Engineering calculations suggest that the log boom drag is caused primarily by skin friction drag and that wake drag is slightly less important; wave drag is entirely insignificant.
A small-scale (4-section) log boom was constructed to test the influence of log arrangement within the boom on boom drag.
Neither aligning the front row of bundles transversely nor covering boom sections with an underwater shroud had a significant impact on the boom drag.
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