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...or you could make an A-Frame to put under the boom when the loads are on the big side..

On the other hand, perhaps I should start modelling ruins from the Classical Age (ancient Greece & Rome). ;D ...Ved. Yep - sell them online to the wargamer/fantasy gaming crowd...

You have to tell us now!

Might I suggest H Greenly's engine? Much better looking... https://www.youtube.com/watch?v=PHhOG2E0g0U

X craft Say no more..

Shipping from where?

...and fusion360 is free for students and hobby -type users..

I put about 6 hours into DRAFTSIGHT and realized that I was getting nowhere. Was drawing in 3d using FUSION 360 in less than 30 minutes. Not nearly competent yet and there's still much to learn.. good tutorials (for my non-plastic brain) by this guy...

All well and good - what does it look like?

Cannot help but be impressed by this Gents work. One of the best I've seen Get a cup of tea , sit back and enjoy. https://www.youtube.com/watch?v=eb9J5a5eaWs

There's another forum???

[ I have no idea how fast the engine will need to turn to push along a boat. I have never dealt with a propeller....QUOTE] Make the diameter as big as your engine will turn and not pop through the water surface, and with a little less pitch than a paddle wheel...

Very nice work, and I'm sure you'll do a hull to match. Nice to see that engine running so slowly. Seems that so many run the guts out of miniature engines, and all you can see is a blurr.

but it IS a very interesting thing.

You only "need" one cam for a V...

Where do you live, Ben...maybe someone is nearby..

As for Stirlings, have you looked at the MORIYA (Dr James A Senfit)? At least it has a purpose... https://www.youtube.com/watch?v=Q6AJLq8bKKI

Super hispeed steam fellers really push the limits of the hobby..you never know exactly when the entire engine is going to melt out of the bottom of the boat. Regardless, the engines do have a purposeful beauty to them: (again - I didn't build any of these)

Best I can tell... Double expanding, single acting, piston-valved attempt at a high speed steam engine. wet sump, and take note I emphasize "not building" I'm more of a tool collecting dreamer.. I just liked the design