New teak decks over old teak decks

On Tue, 08 Jan 2008 18:55:46 -0800, Jim <jim.DeleteThis@hotmail.com> wrote:

>Wow, hull speed into 25 knots of wind. That's a lot of power.

Of course it isn't. Remember, power required varies with the cube of
the speed, and hull speed just isn't fast. I figure maybe 100 HP for a
thirty foot boat. Maybe less.
It's the fifteen horse motors I object to. Battleships won't do hull
speed on 1 to 4 HP per ton either. I am guessing you can get
three times what is average, for not too much space and weight.

>It would be impossible to power at hull speed into a 25 knot wind, and
>the seas that much wind kicks up.

Of course it is possible, it just takes sufficient power. You can get
500 HP out of a ton or so of diesel machinery. Many modern engines,
Yanmars for example, put out more than one HP per cubic inch. It is
certainly possible and the fact that most boats won't do it is rather
the point of my post. I figure you can live with a ten percent mileage
penalty with the bigger motor.


If there is enough room for large waves to kick up, you can generally
sail. I had in mind up a narrow river channel against wind, current,
and tide. Places like the inside passage to Alaska, more motor might
be handy.

I have done lots of sailing, not cruising, in more than 25 MPH of wind
and 2 to 3 foot waves. I used to launch a Sunfish off the beach into a
25 MPH wind. You waded out to where the water was deep enough to lower
the daggerboard. And on the return I would just run it in with the
board out. The rudder would kick up like a centerboard. Sometimes got
it up three or so feet past the waters edge, if I timed a wave just
right. Same lake had some 25 MPH sailboats: scows.
 >> Stay informed about: New teak decks over old teak decks 

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 >> Stay informed about: New teak decks over old teak decks 

>>I have done lots of sailing, not cruising, in more than 25 MPH of wind
>>and 2 to 3 foot waves.

25mph winds? Force 5-6 and only 2-3ft waves? uh huh...
 >> Stay informed about: New teak decks over old teak decks 

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 >> Stay informed about: New teak decks over old teak decks 

Richard Casady wrote:
(about hull speed to 25 MPH winds)

> I figure maybe 100 HP for a thirty foot boat. Maybe less.
> It's the fifteen horse motors I object to. Battleships won't do hull
> speed on 1 to 4 HP per ton either.


Here in Denmark, 100 HP in a 30' boat would immediately classify it as a
motorboat. With enough rig we might accept it as a motor sailer, but most
people here would not consider it a reasonable configuration for a
sailboat.

Maybe it is a cultural thing, but most sailors here don't compare their
boats to battleships.

"Hull speed", as far as I understand the term, is the maximum a boat can
possibly do. Not the minimum it has to attain under any circumstances, sail
or motor.

I quite enjoy sailing on an old 8-meter boat, about 30' long. I don't
remember the details of the engine, but it is well in the neighbourhood of
your 15 HP. It is more than sufficient to get us out of Copenhagen harbour
and in again.

In my (too short) spare time I dream of building my own boat - that's why I
follow this newsgroup. It will be under 30' long, probably rigged as a
schooner, and I will not go to the excess of 15 HP motor, more like half of
that.

But, of course, it all depends on where, how, and why you want to sail.


Best regards

Heikki
 >> Stay informed about: New teak decks over old teak decks 

On Wed, 09 Jan 2008 16:16:46 GMT, salty.DeleteThis@dog.com wrote:

>How big was the auxiliary on your Sunfish?

How about the family heirloom 1920 vintage 1/2 HP Evinrude.? My dad
used that motor as the auxiliary on a 20 foot schooner that he built
on a rowboat hull. You could probably mount it on a Sunfish, it maybe
weighs 25 pounds. Has a nasty starting rope, but it is at least easy
to start. It may even have low hours on it, no way to tell.

Casady
 >> Stay informed about: New teak decks over old teak decks 

Richard Casady wrote:
> On Mon, 07 Jan 2008 04:52:02 GMT, "Island Teak" <islandteak.TakeThisOut@shaw.ca>
> wrote:
>
>> Any teak deck that requires replacing has probably had that 1/4" worn off in
>> service.
>
> Every cruise ship I have been on had teak decks. They didn't maintain
> them, hosed them down, perhaps, and I don't know why they would wear
> much if any. Traffic wouldn't do it, those things are big and the wear
> would be well diluted. The planks were perhaps three inches wide, and
> must have been maybe 3/4 inch thick? You need a certain thickness,
> relative to width, to avoid cupping. Of course they don't have to
> impress the neighbors with well sanded teak. I mean we saw one boxboat
> in two atlantic crossings.

Cruise ships built in the Aker yards in Finland have at least 4" thick
teak decks. (I've seen photos). They probably sand them down every
year with a floor sander. Never have to replace them during the life
of the ship with that much thickness.

Evan Gatehouse
 >> Stay informed about: New teak decks over old teak decks 

"Evan Gatehouse" <ceilydh***NO_SPAM***@shaw.ca> wrote in message
news:aLihj.38008$uV6.20510@pd7urf1no...
> Richard Casady wrote:
>> On Mon, 07 Jan 2008 04:52:02 GMT, "Island Teak" <islandteak.DeleteThis@shaw.ca>
>> wrote:
>>
>>> Any teak deck that requires replacing has probably had that 1/4" worn
>>> off in service.
>>
>> Every cruise ship I have been on had teak decks. They didn't maintain
>> them, hosed them down, perhaps, and I don't know why they would wear
>> much if any. Traffic wouldn't do it, those things are big and the wear
>> would be well diluted. The planks were perhaps three inches wide, and
>> must have been maybe 3/4 inch thick? You need a certain thickness,
>> relative to width, to avoid cupping. Of course they don't have to
>> impress the neighbors with well sanded teak. I mean we saw one boxboat
>> in two atlantic crossings.
>
> Cruise ships built in the Aker yards in Finland have at least 4" thick
> teak decks. (I've seen photos). They probably sand them down every year
> with a floor sander. Never have to replace them during the life of the
> ship with that much thickness.
>
> Evan Gatehouse

Your right, however those 4" thick decks often only have two inches of
usable life until the decks wear down to the screw/bolt height.
These days that is more than ample as the life of a cruise ship is often
limited to 30 to 40 working years.
The S.S. Norway was built in 1961 and now sits in the mud at the India
shipbreaking yards.

...Ken
 >> Stay informed about: New teak decks over old teak decks 

On Thu, 10 Jan 2008 06:16:38 GMT, Evan Gatehouse
<ceilydh***NO_SPAM***@shaw.ca> wrote:

>ruise ships built in the Aker yards in Finland have at least 4" thick
> teak decks. (I've seen photos). They probably sand them down every
>year with a floor sander. Never have to replace them during the life
>of the ship with that much thickness.

US battleships were built with four inch thick teak decks.In the case
of the cruise ships, I had thought the teak was supposed to be good
for the life of the ship. If they never sanded it, it would last
forever, and not just forever for all practical purposes.

Casady
 >> Stay informed about: New teak decks over old teak decks