Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Your volume is almost exactly what I had calculated too. The smaller 1 gallon ultra quiet air compressor might not be enough to run at sustained rpm I was planning about 1,000 cruising speed and 35,00-4,000 top speed with the exhaust tuning to the turbines they don’t take much at all until loaded. I haven’t even figured that out yet it’s going to take a pretty fancy gear box to gear 50k down to a usable value. I’m in the middle of a staged planetary unit. I found that rod or bar stock pinion is available so that part is not bad ring gears are expensive and not common I could probably do an external gear just the opposite of internal but my design will need major changes. That’s what happens when you get locked into a thought there are even a couple model gear boxes around but I’m going to support USA economy and stay here. Politics aside. Brass gears are going ballistic now maybe I can get something 3D printed.  The turbines have only a 5/64 shaft so I don’t think that will last long there is a shaft calculation that rail roads used to analyze analyze  axels. I don’t have my Roarks book here so maybe I can find it on the internet. I’m planning on replacing the shafts anyway as it’s hard to find couplers that small.

Regarding corps ion, being ex boater I’m well aware of corps ion I did plan on a zinc anode there are all kinds of boat ones the local marine store has lots of them. The end caps will be easily removable so cleaning the boiler will be a regular item. Copper and aluminum don’t work too well together there was a lot of bronze on my cruise. The props and rudders primarily. It was easy to clean them before spring  splash in. I just hit them with the small angle grinder and wire brush. The rudders had zincs so they were easy to remove and clean there were zincs in the bilges too although there wasn’t much to corpse ther the pumps were mostly plastics there were a couple in the engine room around the engines but much of the engine stuff was bronze even the oil coolers there were lots of ground wires anything aluminum was grounded with wires to the engine even cylinder heads and intake manifolds were grounded . The exhausts were subject to rust and corrosion and a real problem if they got bad. Mine were very good but my neighbor had his rust out really bad there may have been zincs in the mufflers too but I never had issues with mine seems like there was a ground wire there too as there was a rubber flex hose between the manifolds and mufflers.  Thy aren’t a primary concern now anyway.  I’m glad I’m out of the boat. They are a constant source of expensive maintenance  both motors had water separator as did the generator. It seemed like I had to change all of them every time we went out . You never want to be dead in the water on the Missippi river with the tugs and barges they don’t like having to get out of erratic boaters.
Byron