Davidson 52 look around

[MikeJohns]

Here's a nice look around a Davidson 52. Good effort.

http://www.svtauranga.com/tour.php

[Gypsie]

I am impressed, very nice indeed

[Paul B]

Originally Posted by MikeJohns

Here's a nice look around a Davidson 52. Good effort.

http://www.svtauranga.com/tour.php

Funny.

This boat represents just about everything you rail against on this board.

Light displacement: D/L 133

MCR<28

Just as beamy for her length as those terrible TP52s!

Fin Keel with bulb. Guaranteed to have a "snappy" motion that will throw poor sailors about while they try to hang on for dear life.

Not made of steel, so guaranteed to be holed by impact from a flying fish.

[Gypsie]

Different folks for different strokes mate, I was under the impression the "forum" caters for all.

[MikeJohns]

This link is to a well presented website which will be of interest to many.

For a performance boat it appears to be well thought out and designed without the temptation to mimic a racing hull-form.

A very moderate beam, relatively balanced hull, designed and manufactured with great attention to detail. Engine access is good, deck layout is sensible.

As for snappy roll the motion that could be better than you might first think, the ketch rig will significantly increase the roll gyradius . With the cruising gear aboard GM may be fairly low too. I also see a very sensible and substantial keel that will add significant damping, will be resistant to collision damage and is unlikely to part with the hull.

Vertical acceleration as you say cannot be avoided and will be the bugbear of any lightweight performance cruisng boat, some people cope with this, some get miserably ill or medicate themselves for the trip, or try and avoid any sea state that they find uncomfortable. That is the downside of this vessel.

I have posted nothing on TP 52's specifically. I think you are confusing me with someone else perhaps ?

[lazeyjack]

Know Ole Laurie well, wonder if he is still around, worked with him a bit and plated a 46 down in Ch Ch, two of us 2 weeks
That is nice boat Ole Laurie never did take to CAD, used to draw all his lines the old way then get Kevin Dibley to to it all in CAD
hello Mike Ole bean

[MikeJohns]

How are you Stu

New Zealand as a nation has some very professional and capable design and production capability and the build quality of many of the boats is a real credit to them. Not sure how it's going to pan out now the US dollars so weak .
cheers

[lazeyjack]

Originally Posted by MikeJohns

How are you Stu

New Zealand as a nation has some very professional and capable design and production capability and the build quality of many of the boats is a real credit to them. Not sure how it's going to pan out now the US dollars so weak .
cheers

Abt 12 years back i was MAREX member, that is MARINE EXPORT GROUPNZ, I can remember totel silence when I muted that we were trading on the weakness of our dollar, it was then .38 USA, Sure nuff, the industry is very quiet EXCEPTING the super and megayacht scene

[Paul B]

Originally Posted by MikeJohns

This link is to a well presented website which will be of interest to many.

For a performance boat it appears to be well thought out and designed without the temptation to mimic a racing hull-form.?

There have been MANY lightweight "performance" boats that do not mimic a racing hull form, whatever that means. You have chosen to bash the type time and again. This is simply one example of this wholesome type.

By the way, the CCA boats that some of you seem to love so much were also mimicing racing hulls.

Originally Posted by MikeJohns

A very moderate beam, relatively balanced hull, designed and manufactured with great attention to detail. Engine access is good, deck layout is sensible.

As for snappy roll the motion that could be better than you might first think, the ketch rig will significantly increase the roll gyradius . With the cruising gear aboard GM may be fairly low too. I also see a very sensible and substantial keel that will add significant damping, will be resistant to collision damage and is unlikely to part with the hull.?

According to your many posts, a lightweight cruising boat will sail terribly once loaded with cruising gear. Why are you contradicting you long held beliefs?

The snappy motion I referenced is not something I am concerned with. It is something you and your ilk are constantly bringing up to try to scare people into buying your outdated technology.

Originally Posted by MikeJohns

Vertical acceleration as you say cannot be avoided and will be the bugbear of any lightweight performance cruisng boat, some people cope with this, some get miserably ill or medicate themselves for the trip, or try and avoid any sea state that they find uncomfortable. That is the downside of this vessel.?

I guarantee no one is going to have more trouble with sickness on this boat than they would be on a Bristol Channel Cutter.

Originally Posted by MikeJohns

I have posted nothing on TP 52's specifically. I think you are confusing me with someone else perhaps ?

You often spout off about "beamy" modern boats. That's because you and others know little about what's been happening in the real world since the '79 Fastnet.

[lazeyjack]

boy that is one cheap boat
The two things I dont like
the steering position, for many reasons, and the transom
these days IMO all yachtshould have one like this, although I designed it, I have never met anyone who did not admire Steps not a ladder lead to water and old people can easily access the briny
Paul I think calm down man, Mike is one of the forums gentlemen, he even forgave me for giving him neg feed(since redeemed myself)
there are many types I dismiss as not my type for crossing oceans or going around the cans , but I don't have to own what I don't want to own

[MikeJohns]

Cheap at $450k USD ?

Stu
It looks like there's a steering pedastal in front of the mizzen. Surely it must be, you couldn't sail the boat from the sheltered one.


Paul .....will you listen if I answer you?

I was talking of unbalanced racing boat hulls optimized for ULDB downwind surfing with a large lifting surface, flat sections and minimal-strut bulb keels so popular at present that we are supposed to consider (marketing) as ideal cruising boats. The performance related ratios and coefficients are altered considerably with immersion.

The result is a boat that performs poorly with a load, often lacks structural rigidity and is prone to grounding and collision damage, in short it is not as durable or as suitable as a cruiser with a more 'conservative' design such as the one here presented. Then there’s also the changes to GM GZ-curve LPS etc that occur if you ad a cruising load to this type of hull. Look at Guillermo’s recent posts on the Pogo; We can (and did) predict that there is a high probability for the vessel to capsize and remain inverted and no surprise here.

As I’ve said before; bigger light-displacement boats absorb the load more effectively than smaller boats and that the cruising load becomes less of an issue as the boat size increases. This is a 52 footer. I have also said many times that it is perfectly possible to produce light fast strong durable and seaworthy yachts, with the caution that motion comfort can be poor on this type of boat in certain sea states, and that is the compromise.

I don’t rail against the concept, I try and show that there are compromises in every hull-form and that some trends make a boat unsuitable for a non-professional crew or unsafe for various reasons for an ocean passage.

What you call snappy motion (high roll acceleration) has been experienced on laden ore carriers of thousands of tons, it is a combination of factors that would take some time to explain in detail but has little to do with displacement.

I and others have offered you supporting papers studies and references in the past; you have neither requested them nor discussed any of the issues so raised. It is not a conspiracy, I said already open a new thread on any issue and we’ll discuss it in detail.

[lazeyjack]

yes work on 100000tonne disp min to replace, so say she is , um, 16-17 , that is 1.6-1.7 million
But most of the world shys from this type construction