"DSK" wrote in message
| No booze involved, not even American beer. The Soverel 33 is renowned as
| a light-air speedster though, probably not a fair comparison. They make
| a wake you can hear from 1/2 mile off on days when the wind is barely
| enough to disturb cigarette smoke.

Yeah Doug...and I can drink a keg of beer and not fall down.


| It wasn't a C&C 34, it was the 34/36+ (or it might have been the 34/36
| XL, not sure). Like this

Mumble Mumble...Gr-r-r-r....damn models and yearly changes... I swear they
just do it to **** me off!
|
|
http://www.yachtworld.com/core/listi...oat_id=1193723
|
| The boat rates around 90 PHRF, in other words more than a minute per
| mile faster than your boat.

Oddly enough I don't see a bow wave on that vessel either.


| Huh??? That's not at all how it works. The wave-making resistance of a
| hull increases with her speed in proportion to her Froude number, which
| is a fairly complex derivative.

That's not going to overcome friction/displacement and allow for a speed
faster than the wind pushing you is it? Even on plane I doubt a boat will
exceed wind speed. That would border on the perpetual motion theory.

|
| But let's make it simple... a hull with a 30' waterline has a "hull
| speed" of 7.3 knots... meaning that at that speed, the crests of her
| wave train will be 30' apart and she will require tremendous amounts of
| increased applied power to go faster. At roughly 2/3 that speed, or 4.4
| knots, she will be making waves of half her waterline length.

Now that's odd..... hull speed is a figure of the hull's shape and wetted
surface. In other words the limit the boat can theoretically make at optimum
speed without beginning to push water. After that 'speed' has been attained
the force required to surpass it requires exponentially more force. At least
that's how it was explained to me in my youth.

| They may not be very high but the bow wave will certainly have a curl or
| breaking crest, the stern wave probably will too (although it's a well
| regarded feature of "fast" boats to leave low & clean stern waves).

Obviously we have a difference in interpretation of a wave here Doug. I
consider a six inch 'bow wave' as nothing more than a ripple. A bow wave is
when you have water curling off the bow. Upwind it's far easier to effect
this than downwind. I'm certain you've experienced the feeling of a heavy
boat cleaving a large wave on a downwind run and sending tons of water
aside.

|
| Now bump the speed down a notch or two... only ripples? Sorry, you need
| to pay closer attention... stop sneaking beer into the classroom and put
| down that girly magazine! Anyway, depending on the hull of course,
| there's no way a displacement boat is going to move at 1/2 or even 1/3
| of her hull speed, when wave-making resistance is definitely a factor,
| and make "only ripples." Small waves... OK but not ripples.

I can move Overproof downwind easily at half her hull speed in 5 knots of
wind and only see ripples... not waves.

| Jack Daniels? You can have my share... I've been hiding a bottle of
| single malt in the desk...

I found a bottle of cheap champagne in my cooler..... rum on Friday! ;-)

CM