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Very nice strong design. 👍

My father and I built this OPS flat twin in the mid 70s. The rear support on the crank is now missing and was supported with a tiny ball type bearing. The crank pins were press fit and tack welded, rods are titanium. The engine showed amazing speed and rpm's but suffered from many failures...

I would definitely have to agree. At first inspection they seem awfully crude by todays standards but like so like many things of a bygone time, these units are so simple and basic in design that with few tools and very little knowledge they can be made to function quite satisfactory and...

I picked one of these up a while ago with plans of building a miniature version. They were known for being an inexpensive very (some what) reliable early outboards and have a large diehard following. They were manufactured in what is now my hometown of Poole, Dorset. UK. Just lately my interest...

Progress on my Scratch build 1/6th scale Miss Severn/APBA Runabout. Mahony planks install.

Thanks for the info. Decided to play it safe and go with aluminium after all.

Just reading, they do list Ether as severe effect on Polycarbonate plastic

Sorry, yes I was thinking of a clear material. Thanks

Hoping to get some advice on what material I should make this model Diesel engine fuel tank out of. I have a resin printer but not really confident that the resin would hold up over time. Looking to machine one up. I wonder if anyone here has had experience with this. Thanks

Nice to be able to sit the 30cc Seal major engine in place. Getting a few things worked out in CAD as to the exhaust, fuel tank location, starter battery etc

Lots of evenings in the shop and good progress on the Hacker 1/6th scale I'm building for my 30cc Seal Major. 200+ Planks o_O , most off them needed steam. Happy that's done and now its off the build jig. Starting on the topside.

Nice work Peter. What compression ratio will you be using? Methanol/Nitromethane being the fuel? Thank you for documenting the build. 👍

A little more progress on the 1/6th scale Miss APBA. for the Seal Major 30cc

Interesting design with the piston oil return. My Seal Major smokes more than I would like and this could be an easy solution without having to make another ring. Have you used this idea before? Thank you Terry, I'm learning lots.

Just starting on a boat build for the 30cc Seal major. Finally got all the CAD done apart from a rear hatch for the radio box. Busy cutting out bulkheads and building jig.

Thanks Bob, Still trying to get my head around this. Great 3D scan of the original. Is the upper valve shaft not 2 piece? Just wondering why one upper valve levers would need to be disengaged for normal running. Now I'm afraid I am going to start showing my complete lack of knowledge when it...

I like the design. Going to be a nice engine.

The CAD program I am using is Fusion 360 which is free to the hobbyist. I save to an STL file under the export tab. My 3D printer is a Prusa MK 3 and I use their slicer. I can 3D print as drawn so its worth spending some extra time to get things looking as close as possible. For production of...

Sounds like you got a great deal on the furnace Don. Amazing what you can score if your good at fixing things. As you said definitely not large enough capacity for castings as large as a block but interesting features such as water pump, thermostat housing etc could be fun to try.

Hi Don I am dipping my feet in the water a little.