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by Kevin Morin
Sun Oct 18, 2020 11:48 am
Forum: Metal
Topic: Aluminum Boat Cabins
Replies: 52
Views: 40435

Re: Aluminum Boat Cabins

North, if you accurately draw the plan view of the boat, or built accurately to the plans then you could use them for your cabin plans. Looking at the plan view- the sheer clamp/guard deck/gunwale plate that attaches to the sheer is either a curve following the sheer in Plan View OR its a line ? In ...
by Kevin Morin
Sat Oct 17, 2020 9:41 pm
Forum: Metal
Topic: Aluminum Boat Cabins
Replies: 52
Views: 40435

Re: Aluminum Boat Cabins

North, lots of info there... and many expressed and implied questions. I'd try to give some replies but... they won't be in one four page post. I'll have to try to digest all you've posted, and reply in parts (incrementally) Otherwise, the volume of information you've requested is more than I could ...
by Kevin Morin
Thu Oct 15, 2020 9:33 am
Forum: Metal
Topic: True Grit Aluminum Build
Replies: 14
Views: 1654

Re: True Grit Aluminum Build

polynimbus, Thanks for clarifying your question so well. Yes this would work fine to stiffen the deck edge, seal it from deck wash getting into the bilge and if you put some shelves inside and cutouts to access - make for a nice set of 'lockers' for stowage of miscellaneous items. Have to do some pl...
by Kevin Morin
Tue Oct 13, 2020 3:07 pm
Forum: Metal
Topic: True Grit Aluminum Build
Replies: 14
Views: 1654

Re: True Grit Aluminum Build

polyn' I think you've run into the reason why most of my illustrations come with the parts and pieces in wildly different colors? Shades of gray are about as vague as can be visually found? If you'd add some annotation and lighten the extended deck to topsides intersection it would be much more real...
by Kevin Morin
Sun Sep 27, 2020 1:36 pm
Forum: Metal
Topic: Aluminum Boat Cabins
Replies: 52
Views: 40435

Re: Aluminum Boat Cabins

North the idea of essentially making your own windows of the type you've described is a real challenge with welding equipment. the reason is; as you're already aware, welding very thing sections is increasingly difficult as the sections get thinner. SO getting a window on the side of a cabin- lets s...
by Kevin Morin
Thu Sep 24, 2020 12:02 pm
Forum: Metal
Topic: Aluminum Boat Cabins
Replies: 52
Views: 40435

Re: Aluminum Boat Cabins

North, designing the cabin right into the eyes of the bow won't help the design much. begin the forward windscreen (in plan view) about 5-6" to 6' aft the bow stem and not any further forward due to how little volume there would be for the helm station, looks and foredeck being pretty small. If you ...
by Kevin Morin
Wed Sep 23, 2020 12:18 pm
Forum: Metal
Topic: Aluminum Boat Cabins
Replies: 52
Views: 40435

Re: Aluminum Boat Cabins

North, I think 5052 is fine for a cabin, in some designs the top surface may need a bit more framing (smaller open areas) than the other 50series due to being a little less 'stiff' for a given thickness. But most cabins are done in 5052 to save material costs and to facilitate bending forming- the m...
by Kevin Morin
Thu Aug 27, 2020 7:34 pm
Forum: Metal
Topic: True Grit Aluminum Build
Replies: 14
Views: 1654

Re: True Grit Aluminum Build

Kens, Joe, my advocation for the extreme (5/8" to 3/4") wall mechanical tube is because I've welded in a quite a few shaft logs/stern tubes and had to deal with with weld contraction/distortion/mis-alignment and the resulting re-work or corrections of bearing placement. Not to mention excessive engi...
by Kevin Morin
Thu Aug 27, 2020 3:12 pm
Forum: Metal
Topic: True Grit Aluminum Build
Replies: 14
Views: 1654

Re: True Grit Aluminum Build

Joe, there is a website named "Boat Diesel . com" that has rental calculators- that is there's a fee to join but you get the calculators use for the min. fee. Kind of a rental of the calculators? Reason to mention this is that you can do your own shaft hp speed calcs and even wheel and gear box rati...
by Kevin Morin
Wed Aug 26, 2020 10:51 am
Forum: Metal
Topic: True Grit Aluminum Build
Replies: 14
Views: 1654

Re: True Grit Aluminum Build

polynimbus, Kens is exactly right in his inboard profile sketch. A tube should be cut into the VKB (vertical keel bar- not to be confused with an external keel structure) and to plan this there are several considerations I'll note. First, what will be the overall (LOA) of the shaft? next what will b...
by Kevin Morin
Fri Aug 14, 2020 11:34 am
Forum: Metal
Topic: Tape and tack 16 gauge steel RowMe?
Replies: 9
Views: 2548

Re: Tape and tack 16 gauge steel RowMe?

Leland, as Yofish notes, I'm always recommending (some say ranting?) about cleaning metal, both steel and aluminum, of the mill scale before trying to weld it. On steel the results of trying to weld through mill scale are pretty dramatic- porosity, worm holes etc. On aluminum the puddle (in MIG) fre...
by Kevin Morin
Tue Aug 11, 2020 2:14 pm
Forum: Metal
Topic: Tape and tack 16 gauge steel RowMe?
Replies: 9
Views: 2548

Re: Tape and tack 16 gauge steel RowMe?

D'Dog, I've made boats similar to the one you're showing in different images and vaguely similar to the link of the small rowing skiff (semi-dory?) and so I have some remarks based on experience. I have also built in welded aluminum for many years and have done boats from 42' to 30" with a pretty wi...
by Kevin Morin
Tue Aug 11, 2020 1:17 pm
Forum: Metal
Topic: MIG Welding Aluminum Guide
Replies: 7
Views: 4856

Re: MIG Welding Aluminum Guide

Don, I'm not familiar with the power supply or the wire feeder you're using so I'll just make some generic remarks based on bead appearance. First, the individual puddles seem to be pretty uniform, so that if you continue to use this method of welding (?) you're probably going to have a decent looki...
by Kevin Morin
Sun Jul 12, 2020 11:38 am
Forum: Metal
Topic: MIG Welding Aluminum Guide
Replies: 7
Views: 4856

Re: MIG Welding Aluminum Guide

mcm', glad you're back posting here and thanks for your input. Could you post some pictures? Have you done a section/polish/etch to confirm your assertions about the Lincoln Pulse-on-Pulse weld penetration and performance? I have an MP 350 Lincoln and would absolutely appreciate learning enough abou...
by Kevin Morin
Tue Dec 03, 2019 11:08 am
Forum: Metal
Topic: Aluminum Boat Cabins
Replies: 52
Views: 40435

Re: Aluminum Boat Cabins

North, I'd say the first step in the design helix is to establish the wt that will be carried by the cabin top panel? Many of the boats you show will have crew walking on them with rafts, pots or buoy's lashed down for want of deck space and a need to stow these items for running. If you're not carr...

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