|
Server : Apache/2.4.62 System : FreeBSD fbsdweb2.web.rcn.net 14.1-RELEASE FreeBSD 14.1-RELEASE releng/14.1-n267679-10e31f0946d8 GENERIC amd64 User : www ( 80) PHP Version : 8.3.8 Disable Function : NONE Directory : /domains/daveculp/Savineau/originals/ |
Upload File : |
<HTML> <HEADER> <TITLE>Speed Sailing - The TriFoiler Longshot</TITLE> </HEADER> <BODY> <H1>The TriFoiler Longshot</H1> <IMG SRC="http://www.mit.edu:8001/people/savineau/SPEED/PICTURES/trifoilersmall2.gif" ALIGN=middle><STRONG>TOP SPEED = 43.59 knots </STRONG> <H2>Technical Specs:</H2> <UL> <LI><STRONG>LOA .......... </STRONG>4.57m (15'0") <LI><STRONG>BOA .......... </STRONG>5.49m (18'0") <LI><STRONG>Sail Area .... </STRONG>16.72m^2 (180ft^2) <LI><STRONG>Weight ....... </STRONG>90.72kg (200lbs) <LI><A HREF="rules.html">Official Record (Class A)</A> .... 70.17km/h (37.89knots) <LI><A HREF="rules.html">Official Record (Class B)</A> .... 80.73km/h (43.59knots) </UL> <HR> Longshot is a hydrofoil trimaran with a biplane rig. Two curved foils are mounted beneath the outer hulls, and a third foil forms an inverted T at the bottom of the rudder. The angle of attack of the outer foils is controlled by surface sensors attached forward of the outer hulls with flexible struts. <ADDRESS>(From "A Long Shot" by Larry Tuttle in Sail, June 1992) </ADDRESS> <HR> During the Fall of 1993, Greg Ketterman, the TriFoiler's designer, came to <A HREF="http://web.mit.edu/">MIT</A> for some advice. The TriFoiler seemed to reach an unsurmountable speed barrier around 44 knots, at which point the foils lost all their lift, and the boat came crashing down in the water. He suspected that at those speeds the foils were cavitating. I ran a series of tests in MIT Marine Hydrodynamics Water Tunnel, using a full scale sized foil of his boat. The results of these tests were presented at the <EM>New England Section SNAME Meeting</EM>. There's an <A HREF="http://www.mit.edu:8001/people/savineau/PROF/trifoiler-abstract.html"> online abstract</A> available for those interested. There's also a full length paper available in either <A HREF="http://www.mit.edu:8001/people/savineau/PROF/sname-paper3.ps"> postscript format (84K)</A> if you have a postscript viewer installed on your system, or in <A HREF="http://www.mit.edu:8001/people/savineau/PROF/trifoiler-paper.html"> GIF format</A>. I'll try to put on some pictures from the experiments, in the near future .... <HR> <H1>Here are some more cool pictures of the Trifoiler</H1> <A HREF="http://www.mit.edu:8001/people/savineau/SPEED/PICTURES/trifoiler.gif"> Large size GIF high quality format (203K)</A> <BR> <A HREF="http://www.mit.edu:8001/people/savineau/SPEED/PICTURES/trifoiler2.jpeg"> Large size JPEG medium quality format (85K)</A><BR> <HR> <A HREF="http://www.mit.edu:8001/people/savineau/SPEED/intro.html"> Back</A> to Speed Sailing Page <HR> </BODY> <ADDRESS> Last modified: Wed Jul 26 15:13:27 EDT 1995 <BR>[email protected] </ADDRESS> </HTML>