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One too many compromises is like too many cooks in the kitchen... I had some idea that a tip of the hat toward low-speed displacement cruising would adversely affect the planing hull performance. Now, on to figuring what kind of HP would be required to move the extended hull at 3-6MPH, then how...

I don't have a target for my cruising speed. Most of what I've read from other C-Dory owners regarding cruising speed varies from model to model. There is no other flat-bottomed 28' LOA, 7.33' beam C-Dory to compare hull characteristics one-to-one, and I don't have any powerboat design software...

Most of the flat-bottomed C-Dorys top out at around 30MPH. Beyond that and they tend to lose steering control.

Something like this:

I've got an '84 C-Dory (not Cape Dory) and have been extending the hull. I've worked with a naval architect who gave my design a thumbs up, but that was before I got interested in the possibility of auxilliary electric propulsion. Unfortunately, the NA passed away, so I'm looking for input here...

Tunnels, The individual words you write are regular, normal, comprehensible words. I'm certain you know what you're talking about, but what comes across here is incomprehensible to me. Knowledge, skills and ability are one thing - conveying them to someone else is a whole 'nuther thing...

Well, both inside and outside corners on the lapstrake offsets and the running strakes are 1/4" radii. Perhaps that's not enough, but again, using a hotter hardener seems to work just fine. Thanks

And that's only the resin; add about $40 for the hardener. I've been using 635 Thin laminating epoxy from U.S. Composites on my hull extension project. I've had difficulties using their medium hardener and have half a gallon of their fast hardener on the way. Hopefully, it'll work more like West...

Their stuff is expensive, but at a 5:1 resin to hardener ratio, half a gallon won't require that much; something like a shy pint...

Testy? I don't know how you read that into it. Maybe I need to use lots of emoticons... That said, however, it is a bit frustrating to learn about fiberglass/epoxy work in a relative vacuum. In my situation, I have only books, YouTube videos, and online forums from which to learn. And those...

The existing hull is a quarter-inch thick. I wonder how many layers of 6oz. cloth it would take to make up that thickness? It takes six layers of 1708 to make that dimension. As of today, the only question that remains is whether or not the faster hardener from U.S. Composites will do the same...

I agree, there's not enough resin. As to the corners, C-Dory has been building boats with those lapstrake corners since 1979. I talked to their shop foreman and he told me they're currently using 2408 to construct the hull. They're using a female form, but still, they must have to do some...

So far, so good. Yesterday, I used West System with 205 hardener, rolled it onto the hull, waited, rolled dry 1708 onto the tacky epoxy and wetted out the glass. Nice results: no puckers, no bubbles, no problem. Today, I used West System with 205 hardener, rolled it onto the hull, then...

Vacuum seemed like the way to go, but I'm apparently too inexperienced to make it work properly. I left plenty of plastic bagging material to accommodate the one-inch lapstrake offsets, it still wouldn't press down the inside corner; it bunched up elsewhere and I wasn't able to smooth it out...

Looks like one of those good ideas that's ahead of its time, and materials, and experience... Hope they get it right in the near future.

brokensheer, Certainly, I don't know why your very wet lamination ended up with white spots starved for epoxy, but I wonder if you had first coated the cold-molded substrate with a couple of coats of epoxy. On the surface of your short post, it sounds like the 1708 appeared well wetted out when...

Perhaps I'm overcautious, but I use the drywall bags and an HEPA filter in the shop vac these days. On occasion, I find a hole in the bag and a clogged HEPA filter that provided backup.

Well, at least it's a short drive for me...

I'll use peel ply with the vacuum laminations that are coming soon to a shop very near me. I needed to get the C-Flex and plywood that constitute a male form for my hull extension well sealed with epoxy and glass to make it a very-nearly airtight surface for vacuum work when I get back. I'll be...

Yup, operator error has always been the stray parameter I've had trouble with. I'm finally becoming confident about my understanding of this process and how to use this new-to-me epoxy product (always a West System user prior to this). I'll be willing to take my wife, aka most favorite person...