Sheered waterline.

[Tad]

And here's Britton Chance camouflaging really high slab-sides with a wide boottop and matching sheer strake....Ondine III or IV....?

[DCockey]

Question for those with real-world boottop experience:

Can a boottop profile which looks nice in a 2D profile drawing wind up looking slightly odd if lofted directly onto a hull witout any adjustment, particularly if it's a hull with a bluff bow or stern? Not suggesting it would always or even usually happen but seems to me it should be possible to get an un-intended powderhorn shape in the boottop.

[michael pierzga]

Hmm...must be Ondine IV with the inboard rudder and tall mizzen that could be canted to windward. . So many Ondine's its easy to mix em up. Ondine III had an outboard rudder and was designed by Tripp ? cant remember...getting to old.

[Bruce46]

Tad in response to your posts I went back and looked for the origional note I got from Rod. After going through some old papers, I did find the original memo. They were not cast in stone and I'm sure that adjustments were made. The fromula appears to work better on longer boats as I did a 61' motor yacht and the formula bootstrip looks great while on a
42' motorsailer it is too thin, perhaps there needs to be a adjustment factor for the height of the sheer in relation to length.

As an aside I worked with Bob Harris on a couple side jobs while working at S&S

[Bruce46]

Please note the corrections to the boot strip formula that I posted.
Thanks

[Tad]

Thanks Bruce.......I agree there should be another factor for height of sheer and/or length of the boat.....but what you have provided can be a starting point for anyone, and I'm particularly pleased that both top and bottom are curved.....most of the time it's impossible to get boatbuilders to actually do this........now I can say..."well this is the way they do it at S&S"........

Bob Harris is an old friend and mentor long ago....he's well and living in Vancouver, retired and busy keeping the books straight in his housing co-op...he self-published a slim autobiography in 2008, Tracks on the Water, My Life in Yacht Design, ISBN 978-1-897518-81-6

You mention side jobs with Bob.....multihulls perhaps?

[claydog]

Originally Posted by DCockey

Question for those with real-world boottop experience:

Can a boottop profile which looks nice in a 2D profile drawing wind up looking slightly odd if lofted directly onto a hull witout any adjustment, particularly if it's a hull with a bluff bow or stern? Not suggesting it would always or even usually happen but seems to me it should be possible to get an un-intended powderhorn shape in the boottop.

While i don't have experience with boottops I do work with putting 2d lines on a 3d surfaces every day and the answer to your question is yes it very likely will look a little odd. you also will get a slight powder horn due to the differing plan views at the top and bottom of the boottop. Masking tape is a great tool to layout and tune the lines before commiting to paint.