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I went a bit too shallow this weekend and the prop picked up a stone or similar and cracked the cavitation plate. So now I have a little crack and dent in the cav plate. My plan is to tap it back into shape against a flat block, then prep and TIG weld the crack. My question is: Do I need to...

Now that the kids are all grown, and moved out, we've sold our alloy powerboat which was suitable for up to six people, and we are downsizing to something suitable for two. The plan is to find an old V16 or V17 Haines hunter and do a rebuild. The idea is to make a little pocket-battleship...

Does anyone have experience of using these outboards? Specifically about their durability, noise and vibration characteristics they are. Background I'm currently having a design done for fast work boats that will have twins jets units powered by twin diesel inboards. The twin config is for...

Does anyone here have experience making composite gasoline tanks for trailer boats? I'm interested in learning anything/everything about it. Resin types, cloth types, etc etc. Full background details below. Why am I even contemplating a composite Gasoline tank? I found this YT video, How I...

I'm replacing twin 70HP two strokes with a single four stroke. How much HP do I need? I have a 6m aluminium planing trailer boat. It has always had twin 70hp carburetted Johnson two stroke outboards (pod mounted). Runs well with this setup but squats a little in the stern. The boat is...

I haven't managed to find any specifics but this looks interesting. Electric catamaran ferry. https://i.stuff.co.nz/national/109397200/new-zealands-first-fullyelectric-ferry I live part-time in Wellington, NZ where this new vessel will operate. Wellington is famous for its wind. The...

I could use some advice on the best way of fabricating a one off catch bin for my new kayak. Purpose designed fishing kayaks often come with removable catch bins that fit neatly into the rear well (example). This keeps the mass of fish and ice down low and reduces windage. People in wider...

I have an issue with my trailer boat. It leans to one side at rest and at idle - confirmed with spirit level. It feels level on the plane but its hard to tell. I have a multi-roller trailer and the lean causes the boat to go onto the trailer at an angle which causes problems. The helm...

Does anyone know how wide a centre console should be to shelter (with a screen) two seated adults? I cant find a guideline anywhere.

TLDR: Can I reliably use relays at the transom to switch the manual circuit on my bilge pumps and control these from the helm? Why? To reduce the length of the manual supply circuit and therefore reduce required cable gauge. The manual circuits run power from the battery to the (forward)...

This is my first post on Boat-design. I'm from Nelson in New Zealand and I'm a keen fisherman. I'm trying to devise an ideal boat for launching/landing on rugged beaches for the purposes of going fishing/free-diving. I want to launch, cover a couple of miles fish and return. I need to be...