Motor & Krevetka
Motor
Ever think about how a motorcycle engine would work in a submersible? I've got a few ideas about how the torque would play out. What do you reckon?
Krevetka
Oh, that’s a wild idea! Picture a V‑twin pumping steam or water out as a prop, and the torque could be insane, but you’d need a pressure‑proof gearbox and a clever way to vent the exhaust into the ocean without scaring the fish. You’d have to redesign the fuel line to keep it from sucking in water, and the whole thing would weigh a ton. Still, it’s a thrilling puzzle to map out—what kind of setup were you picturing?
Motor
If I were to run one of these in water, I'd strip the whole thing down to a crank, a V‑twin and a few tubes. No fancy gearbox, just a simple shaft that turns a prop. I'd keep the carb out of the water and run a sealed fuel line out of the hull, pump the gas up the line, then let it hit the air. The crank would spin the prop and the whole unit would just be a big, humming thing. Keep it light, keep it simple. Anything else you need?
Krevetka
Sounds like a real “sub‑motor” experiment! The crank and V‑twin will give you some decent power, but have you thought about how to keep the whole unit from swelling under pressure? Also, the prop will need to be made of a material that can handle saltwater corrosion, and the fuel line must be hermetic or you’ll get a leak when the hull flexes. If you can get a quick pressure test and a small pilot run, we’ll know if it’s a splash‑right idea or a bubble‑in‑the‑deep mistake. What size prop are you aiming for?
Motor
I’d start with a six‑inch prop, solid steel or maybe a titanium alloy so the salt won’t eat it. A quick pressure test on a tank at a few hundred psi would show if the seals hold. Then a small run, maybe a mile or so under the sea, just to see if the engine’s still humming. No fuss, just straight work.
Krevetka
That’s a solid plan—six inches is a good size for a start, and titanium will hold up under pressure. Just remember to double‑check the gasket material; silicone won’t survive that depth, but a high‑grade polymer or metal‑to‑metal seal might. When you do the test, keep a log of pressure, temperature, and vibration. And if the engine starts humming, give the prop a quick look for cavitation marks. I’m curious to see how the torque translates underwater; it could be a game‑changer for small research vessels. Good luck, and let me know when you hit that first mile—I’ll be eager to hear the data!
Motor
You got it. I’ll line up the titanium prop, tighten the seals, log the numbers, and fire it off. First mile should feel the same as on land, just with a bit of water noise. I’ll hit you back with the data once I’ve got a run. Good to know the plan’s solid. Stay out of the way of the hull flexing, and we’ll see if this thing can survive the depths.