On 20 Jan 2006 20:23:12 -0800, "markvictor"
wrote:

Dan Krueger wrote:
markvictor wrote:
Gene Kearns wrote:

So, have a great day Skipper. I'll think about you as the waves lap
against my 20 degree deadrise transom on my "dilapidated, age stained
and grungy" boat.... and wonder if deadrise on a perpetually dry boat
matters at all!


Your "deadrise" is measured on the bottom of your hull...not the
transom...


Deadrise is the angle of the hull at the transom. You can't measure it
at the bottom of the hull.

Dan

Sorry Dan, I can't agree with you. Having installed 100+ transducers
on just about every type of hull imaginable, I can tell you without
reserve that you absolutely can measure deadrise angle on the bottom of
the boat, the DIY ers use a level and a framing protractor, or a
level,two straightedges, a calculator,and a little guidance by
Pythagorus...I , on the other hand, use an electronic inclinometer, it
takes all of 2 or 3 seconds...
This is to ensure that the sounder or FF is looking at the bottom under
the boat it is installed on, not 50 ft. to 1 side or the other. When
the deadrise spec. is given for a boat ,it is essentially telling you
how deeply a hull is "Vee'd" You can measure deadrise at the transom,
but this will not always give you the construction specification
deadrise value, rather it will give you the deadrise of the aftermost
portion of your bottom, but regardless, deadrise is your bottom's
angle, not your transom's angle. But you don't need to take my word
for it, here's what the ABYC standard says:

"Deadrise Angle" is the angle, taken at midship, at which the hull
slopes up from the horizontal (e.g., A flat bottom vessel has a
deadrise angle of zero degrees; a high deadrise angle value indicates
a deep V-hull);
Regards,
markv

"Midship"! That blows me out of the water. I'd always thought it was
measured at the transom too. Thanks for the enlightenment.
--
John H

******Have a spectacular day!******