I don't care where the engine is just so long as it works it would realy suck
trying to paddle in a boat of that size!
To: [EMAIL PROTECTED]: Re: catalina27-talk: Race Sails & Ballast/IB v OBDate:
Sat, 22 Dec 2007 00:22:16 -0500From: [EMAIL PROTECTED]
Say what? Can you put if in English for us non physics people.-----Original
Message-----From: [EMAIL PROTECTED]: [EMAIL PROTECTED]: Fri, 21 Dec 2007 12:12
pmSubject: Re: catalina27-talk: Race Sails & Ballast/IB v OB
OK
I'll bite. Here's the nav arch answer to OB vs IB
For a catalina 27 at even keel at DWL:
The weight required to sink a catalina 1" (aka TP1") is approx 0.26 ltons, or
600lbsThe moment required to change trim 1" is approximately 650 ft lbsThe
increase in wetted surface for every 1" of immersion is 4.5 sq ft, or about
3%The LCF is 1.2ft aft of amidships, or slightly less than 10' forward of the
transoman 80lb 9.9hp OMC on the transom will generate 1.2" of trim by the
sterna 245lb atomic 4 located 5.5ft forward of the transom will generate 2" of
trim by the stern and sink the boat about 0.25 " further than the OBSo in the
end (no pun intended) the OB causes less "squatt" than the inboard and saves on
total weight and wetted surface. Since the transom is still out of the water
at these loads there is no measurable difference in LWL.As for ballast, the
chain locker is about 13ft forward of the LCF, so if you want to have a
permanent offset to 300lbs of crew located in the cockpit (about 6-7' aft of
LCF) you would require about 150# to generate the countervailing trimming
moment.OK, clearly it's a slow dayHappy Holidays to allPeter
ZahnSnagglepuss#2622-----Original Message-----From: [EMAIL PROTECTED]: [EMAIL
PROTECTED]: Thu, 20 Dec 2007 10:44 pmSubject: Re: catalina27-talk: Race Sails &
Ballast/IB v OB
Oh man - Here we go again. I'll take my outboard any day.
In a message dated 12/20/2007 10:16:57 P.M. Eastern Standard Time, [EMAIL
PROTECTED] writes:
In a message dated 12/20/2007 12:09:34 P.M. Eastern Standard Time, [EMAIL
PROTECTED] writes:
This is all speculation, but I believe when Frank designed the hull, it was
for an outboard and a tiller. So the addition on a much heavier inboard and
wheel (the wheel, also moving you aft) will make the stern squat. This is
obviously not ideal, but IMO makes for a much nicer boat. Also, you can add
enough weight to the bow to nearly sink the thing, and the stern will still
squat at hull speed as it falls into the bow wave. I feel the best option, if
it bothers you, is to move all your "stuff" forward, including the batteries,
but never ADD weight to any boat unless it is a cargo ship.
Tommy,
See AOL's top rated recipes and easy ways to stay in shape for winter.
My inboard weighs 245 pounds and is at the fwd end of the cockpit. How much
does that 9.9 weigh hanging way back on the transom? Can you say Torque? Most
of the time, when the auto pilot isn't engaged, I steer from the fwd side of
the wheel. The only drawback to an IB is the drag from the prop. A folding prop
would cancel that. Plus I don't have to mix gas or have to worry about the prop
coming out of the water!
Barking up the wrong tree!
Ray Winkle 5275Knot HomeSarah CreekGloucester Point, VA.
See AOL's top rated recipes and easy ways to stay in shape for winter.
See AOL's top rated recipes and easy ways to stay in shape for winter.
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