|
|
|
|
|||||
|
||||||
From: mike senko (no email)
Date: Mon Oct 01 2001 - 19:11:55 EDT
Roger,
Why do longer water line boats go faster?
Wave making resistance is a constant.
It takes more speed to build up the troughs that the longer water line boat cannot climb over (in flat water).
Some designers think of it as "suction". The stern wave sucks the boat back and will not allow it to climb over the bow wave unless there is a LOT more horsepower available. So the shorter waterline boat will encounter its stern wave sooner and at a lower speed than the longer water line boat.
Mike
----- Original Message -----
From: Roger Crawford
To: ; Live Aboard
Sent: Monday, October 01, 2001 11:47 AM
Subject: lv-ab: Increasing speed
A few years ago when I owned a trimaran and was a member of "the Amatuer Yacht Building/Designing Group, one of their members claimed that by putting an half a wing at the top part of each side of the rudder (outboard rudder) just under water that it would kinda fool the boat into thinking it was longer and subsequently you would go faster. I tried it and I swear it worked. I think. My current boats rudder protrudes from the water under the counter. I could do the same thing and add a couple of feet to the water line length of my boat and the concurrent increase in speed. Anyone tried this or have any opinions. I don't think I ever heard (or at least understood) the physics behind why longer waterline boats go faster.
Roger
SV Yonder
___________________________________________________________________________
|| The Live-Aboard List : send a "subscribe" or "unsubscribe" request ||
|| in body of message to: ||
|