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Member Since 07 Dec 2011
Offline Last Active Aug 28 2012 08:29 PM

Posts I've Made

In Topic: Donovan 30 gets new foils

12 January 2012 - 01:40 AM

Jim is designing reinforcement to the existing structure because yes it certainly needs to be beefed up. The existing setup has a "shoe" at the top of the fin which fits in a recess in the hull. That system will be abandoned and the recess filled. Or at least that is how I think it will work.....

Sounds good! Thank You, please keep the updates coming.

In Topic: Donovan 30 gets new foils

12 January 2012 - 12:55 AM

keel poured in Turkey? by windseeker yachts, perchance? they seem to be doing a lot of that lately. Serious question: is it really cheaper to have a keel built and shipped from Turkey than to have it locally manufactured? I would have thought the shipping alone would have evened the score a bit...

Yes, and yes, and yes. But especially when a suitable mold already exists and you can combine shipping and production costs. However I'm pretty sure the carbon fin will be made here in the USA.

The current keel reportedly weighs 1356, the new bulb is 325lbs lighter and the carbon fin and support structure will weigh around ???, so the displacement will drop from around 3300 to around 3000, including some of the other mods in the refit probably under 3000. But the draft will be over 6.5 feet from 5.5 feet and all the weight will be in the bulb. With improved foils and this increased stiffness, upwind and reaching performance will be greatly improved, primarily in moderate and heavy air. Downwind and light air not so much except for the decreased displacement.

Although the hull shape isn't as powerful for downwind and reaching as some modern designs, we think it is still worth the upgrade. It is very light, very stiff and very well-constructed. It was already a fairly fast yacht for it's size, especially downwind and in light air, and these upgrades help round out the performance envelope. Although the proof will be in the sailing!

The sail plan is a masthead aluminum rig with conventional spin setup, which is dated (1985), but the SA/D ratios are not bad and I don't have the $$$ to deal with that. Maybe the next owner can take that on. Anyway, upgrading the foils would have to be first mod to handle additional sail area.

Hoping to get it put together for Lake Michigan offshore stuff this summer. Should be fun!

It looks like the old elliptical keel bolt patteren would be a lot longer then the new keel bolt patteren, do you just fill in the unused keel bolt holes with epoxy & glass over? And is there any concerns that the new bolt pattern will not match any of the holes and you have to make all new ones? Also, with all the weight now down in the bulb on a deeper carbon fin, do you also have to beef up, or add structure in the bilge to support it?

In Topic: Donovan 30 gets new foils

11 January 2012 - 02:43 PM

There is very little difference between this rudder desogn and the one on Jim's GP26.....

The new keel looks great also. What is the weight difference between the new and the old? and what was your draft with the old keel and what do you anticipate the new draft to be?

In Topic: Donovan 30 gets new foils

10 January 2012 - 09:10 PM

Previously, Jim designed this:

[attachment=169952:Sept20 005.jpg]

To replace this:


So for sure I'm going to have to inform PHRF now.....

Very nice looking rudder! Who built it and what is the weight difference between new and old?