Location: United States I am interested in taking a 14' jon and adding a 2' tunnel turning this flat bottom into an aluminum cat? Location: United States I would like to turn a 14x4 jon to a 14x6 by adding a 2' tunnel through the bottom of the boat. Location: Galveston, Texas cat or vented tunnel What will you be using the boat for? Location: United States I was thinking that a scooter cat would be more buoyant than a flat bottom due to its catamaran style and the fact that we made it wider from 4' wide to 6' wide. Location: Louisiana Good thread I have thought of a tunnel boat as well but only for speed. Location: United States is there a big difference between marine grade aluminum and regular aluminum sheets. Originally Posted by carpe_diem956 is there a big difference between marine grade aluminum and regular aluminum sheets. I know that 5052 bends a lot easier then say 5086 but I believe 5086 actually welds better then 5052 but it doesn't maybe bend as easily as 5052. Originally Posted by carpe_diem956 I was thinking that a scooter cat would be more buoyant than a flat bottom due to its catamaran style and the fact that we made it wider from 4' wide to 6' wide. Location: United States possibilities I am really fascinated and extremely interested in these aluminum boats. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Design and computer hound lofting of welded aluminium boats atomic number 13 kits kit boats and landing Get Aluminum Boat Plan here http NewBoatPlans The Internet is full of gravy holder plans. 70 items Manage Aluminum gravy boat Designs proven plans for high choice welded aluminum boats. Location: Maryland You may want to look at getting a engine-jet unit out of a jet ski.


Location: British Columbia, Canada I have heard of people sucking small gravel into the jet intake in shallows too.
I pretty much have my mind made up im going ahead with a monohull welded jon boat design.I have looked at countless sights on the web and Im finding that hard numbers for a 16 ft. I missed seeing this thread earlier so maybe your boat is done now and my comment will be of no use. I'm not sure what is meant by a vented tunnel but the idea was to run the tunnel from the engine all the way to the bow.
I was told that a lot of tunnel boats are square shaped when a round tunnel is better for less cavitation but I'm only wanting to go fast. This guy basically takes a full sheet brakes the sides and cuts what is the bottom plate of the boat and pulls the sides in to where he wants them. It's been over a year now and I still haven't built mine yet but I must say I have learned a ton from reading online and I'm glad i have because i would have already made some real costly mistake if I had jumped into it.
We offer premium quality stock gravy boat kits in Aluminum and Steel as considerably as offering customs Design and Custom Boat Kit creation from suitable plans.
CANADA Thanks for your responses.Im hoping to start drawing the new boat this weekend.
I assume that the shape you are using is half of a cone so that both the width and the height gets smaller. Maybe even a paddle-wheel arrangement (seems like the perfect thing for shallow rivers, eh?).
If you look under the inboard utilities & runabouts you'll find designs that could be easily developed in aluminum.
Does anyone make a tunnel so that the area stays realatively constant throughout its lenght.
I've studied a lot of pictures and the way some lay there boat out and this is mainly the mudboat guys but they have some dam good ideas.


And if you want a boat that can also run up on the gravel shingle, particularly look at his Sea Bright Skiff tunnel designs (also protect the propeller really well).
It would seem that it would help ram water into the void to fill the tunnel no matter its height (similar to some air inducted hoods).
The snub files are taken from the completed 3-D Model based on each constituent needed for the boat’s completion. You might be able to use a slow turning prop with a big surface area partially submerged, akin to a surface drive.
One nice thing about Atkin designs - they're tried and tested and the ones on the website are intended for home builders. The low cost flat bottom boat you just purchased is as buoyant as you can get, anything you do to it will make less so.
Obviously they creating these boats out of composite or fiberglass but is there a business in creating these small boats out of aluminum. When you put a tunnel into a hull, particularly in a small boat you sacrifice valuable buoyancy. All the Sea Bright tunnel drives handle rough water (as much as you'll find in your fishing area) very well. In a small boat like you want, you might just be able to use a regular outboard with a shallow draft johnboat. You could put an extended skeg on the leg to warn you when you're getting into trouble, maybe even rig it so your motor tilts up when the skeg drags on something (reversing would be a bugger though, if the leg is free).



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