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Ship props are designed to push water in a linear path, there should be little to no suction of water from underneath the prop. Your main concern is the force of the prop wash pushing from your desired loaction. Since you will normally hear the vessel long before you feel the effects of the prop wash you should be able to anticipate and plan for the increase current (or change in current) during the ships passage. >While exploring a nice wreck just outside my window (1000 ft from my >apartment) I've been "run over" by some heavy shipping (10 000 metric tons) >on several occasions. After checking with the shipping agency it turns >out that the distance from yours truly to the ship could have been some >15-20 ft. The experience is truly impressive, a deafening noise from the >engines and a sound like gravel poured on a tin roof (cavitating props?) >The dive site is a rather narrow sound so during the ships passage water >is shifted, creating a strong current raising lots of muck in the already >murky water. >I guess several other people have similar experiences. Under which >circumstances does this get dangerous? My guess is that the prop suction >from a passing ship is usually overestimated whereas the currents from a >stationary ship *beginning* to crank up its screw could be a real hazard >to divers. >Dive safely :) >/RS > (o o) >+------------------------------oOO--(_)--OOo-----------------------------+ >| Richard Soderberg, MD, PADI DM | The Karolinska Institute | >| Systems analyst | MIC-KIBIC | >| Voice#: +46 8 728 80 00 | Library and | >| Fax# : +46 8 33 04 81 | Medical Information Center | >| Snail : PO Box 200 | Doktorsringen 21 C, | >| S-177 77 Stockholm | S-104 01 Stockholm | >| Email :richard.soderberg@mi*.ki*.se* | SWEDEN | >+------------------------------------+-----------------------------------+ > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. Curt W. Smitka Phone: (313) 747-0252 Administrative Manager Fax: (313) 936-8620 Reproductive Sciences Program Email: cwsmitka@um*.ed* University of Michigan 1109 300 North Ingalls Bldg Ann Arbor, MI 48109-0404
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