strange hulls

Ive seen sevral hulls lately, mostly aluminum workboats, that look like normal semi-vee hulls, but with a canoe-like pod underneath running from the bow to the propellor. I'm baffled by the design, whats the idea?

 

Not a clue. Sounds like the inverse of a tunnel hull though! Can you give us a URL to a photo of one of these things?

Kelly Cook

 

As Kelly says, is there any chance you can take a digital photo or two and post them, or point to a picture somewhere so we can see what you're seeing? I'm curious...

 

Yes. I wanna see!

 

And is the prop right behind that thing ? Is it stremlined or does it stop abruptly at the transom ? And what kind of workboats are they, fishing, tugs, diving,... ?
It's true, some sort of picture, or even a schematic drawing would be useful.
Might be some kind of protection, though...

 

Could be additional flotation was added after design?

 

You may be thinking of the box keel/sponson designs that Phil Bolger (and others) have been employing. My take: it may make some sense in the semi-displacement speed range.

 

it's an engine pod. you can reduce the shaft angle this way. I've seen a number of re-fits in the National Fisherman magazine this way

 

This picture is lifted from the site of Conrad Yachts , the designer, Jarek Kanios. I think maybe this is what the question is about. It’s not an add-on, just the result of putting large planning flats at the first chine. As opposed to a box keel, which blends with the stem.

Gary

 

wild guess.....

Here in Alaska the salmon drift (Bristol bay region) netters have a waterline length restriction of 32'. So the builders of the new boats are getting creative.(Seattle builders) Most of them are aluminum and resemble a 3 story condo on a jon-boat hull. But the fun part is they will do 20+ knots with 30,000#s on board. Usually twin or triple jets. I have seen bulb type bows on them. Maybe what you are seeing is some new derivitive of this style of workboat seen here in the pacific NW. get some pics if you can.
8Kts