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Marchaj fishing boat data?
I'm looking for the data gathered by C A Marchaj in wind tunnel tests of sails for fishing boats (bermuda, lug, sprit, lateen, crabclaw). I've searched the online catalogue of the Canadian Institute for Scientific and Technical Information here in Ottawa, and the University of Southampton website without success. I'm wondering if anyone could tell me if the data appears in any of the publications below. I'm interested in what he found out about sprit sails because I like to put them on my home made boats. I'm half way through his "Sail Performance" on loan from the Ottawa public library in which I found out about the exsistence of the data. "Sail Performance" is heavy going but very informative and does not use any math beyond basic geometry and trigonometry. thanks ------------------------------------------------------------------- 1. "Planform Effect of a Number of Rigs on Sail Power", Proceedings of Regional Conference on Sail-Motor Propulsion, Manila, November 1985 (result of a research programme funded by Overseas Development Administration of British Government aimed at improving performance and fuel economy of sailing fishing craft in the developing world) 2. "The Comparison of Potential Driving Force of Various Rig Types Used for Fishing Vessels", Proceedings of the Eigth Chesapeake Sailing yacht Symposium, US Naval Academy, Annapolis, 1987 3.&4. "Design Factors Affecting Sail Power Based on Wind Tunnel Research into Rigs used For Fishing Vessels, Part I", (1985) "Part II, (1987) -- ------------------------------------------------------------------------------ William R Watt National Capital FreeNet Ottawa's free community network homepage: www.ncf.ca/~ag384/top.htm warning: non-freenet email must have "notspam" in subject or it's returned |
#3
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Marchaj fishing boat data?
Rodney Myrvaagnes ) writes:
Since an explicit assumption of the study was that fishermen would not be willing to learn to sail, the results could hardly be useful to anyone who has done so. What have you found informative in "Sail Performance"? I have all the background to read it easily but found nothing useful. I'm interested in the scalable coefficeints for lift and drag and the numbers which can be found from then, particualry the coefficient of heel which I would like to compare to the righting moment of my design to see how much sail the boat might carry, and at approximately what wind speed it would have to be reefed. The study had 4 sprit sails of different aspect ratios. It would be interesting to see the numbers for some of the other sails as well. "Sail Performance" shows the polar diagram for one sprit sail and references some publications which may or may not have the complete data. Before looking for any of those publications I'd like to know if anyone has seen them and can say of one or the other contains the complete set of data. It would be nice if the data were in an online file somewhere but a search didn't turn up anything. -- ------------------------------------------------------------------------------ William R Watt National Capital FreeNet Ottawa's free community network homepage: www.ncf.ca/~ag384/top.htm warning: non-freenet email must have "notspam" in subject or it's returned |
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