Stern designs and trade offs

[ardoin]

Better up wind than having 18 TGWT approaching from behind. Ehrrr have to put on my CD of Pirate songs on that approach.
Oh, the reserve buoyancy also causes the "hobby horse" affect when you have a short frequency to the waves. I have yet to experience this first hand but here that it is a real problem with Masons. Still hunting down the net post.

[sailaway21]

The third edition of Principles of Yacht Design has a 2007 copyright. I'm sorry for not including that above.

[ardoin]

"Understanding Boat Design" by Ted Brewer provides some discussion about Valiant designs and following seas. Just dug that book up from the stack, but I still think there is a better reference from a net posting. That is a good book all the same.
Yeh, got may avatar to work... now you can see what is about to take you over with no class :-)

[j34035]

Originally Posted by painkiller

Jeff,

What are some good books for reading up on this subject? You mention that Larsson and Eliasson might be a bit dated. Can you recommend a more current book?

Thanks!

I can vouch for that book. It is good reading and explains many principles at a level non-engineers can understand.
DD

[Valiente]

Originally Posted by painkiller

I may add a mini wind tunnel for testing sail design and trim ideas.

Whaddya think?

The wind tunnel is unnecessary. The opinions of the members will provide all the hot air needed.

[Jeff_H]

Much of the information on motion and hull form that I am aware of comes out of papers presented at sailing symposiums that I have attended or from discussions that I have had with researchers and yacht designers. Ted Brewer's book and articles were very good when they were first published, and even though certain aspects have been updated, by Ted Brewer's own admission he has not looked at the yacht design theory that has emerged in the IMS/IRC era.

The same is true of the Principles of Yacht Design which is an excellent text and reflects much of the best of the late IOR and very early IMS thinking. I have not read the latest version, other than to scan through a copy, but my sense is that the revisions in the 3rd edition are valuable, they are not as comprehensive when it comes to issues like the one that we are discussing.

Jeff

[painkiller]

Thanks, guys. I'm writing up my Christmas list a little early this year.

[painkiller]

Originally Posted by Valiente

The wind tunnel is unnecessary. The opinions of the members will provide all the hot air needed.

Hah! OK, well maybe the fan for the tunnel is not necessary. That would be recycling. The hot air from an argument about sail trim or rig design could drive the wind tunnel used to test the opinions!

Now, if we can start a debate on the best brewing techniques, the bar wouldn't need to purchase beer!

This may work.

[Rockter]

I have a canoe sterm ship, a 36 ft Union Polaris. It made an Atlantic crossing.

Most flat-sterned cruisers have more room and light aft, are often blessed with an aft cabin, and are better for families. They are certainly easier to board. Most really don't see a big following sea often, so it's not much of a disadvantage. Beware of wave slap when at anchor with the low overhang. It can drive the sane insane.

For me the canoe stern is prettier, and probably more stable in a really big folowing sea. They are often blessed with a near-full keel, which helps enormously. For me, full keel is where it's at. They tend to be slower in light airs, and heavier, and the big keel not so good to weather.

I have never sailed heavy weather in a flat sterned ship, so I cannot really compare them.

[painkiller]

Originally Posted by Rockter

Beware of wave slap when at anchor with the low overhang. It can drive the sane insane.

Yeah, I second that big-time. Luckily for me, I didn't start out with much sanity.