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  1. smi3th

    200,000rpm 20Hp gearbox

    Cost is an interesting variable. I never would have thought of hobbyist sources, but look at the Horsepower-per-Dollalr one can get! A turbine has very few moving parts, and the potential for very decent fuel economy. The question of headwind or tailwind and planning for the whole activity...
  2. smi3th

    200,000rpm 20Hp gearbox

    The Israeli presentation from that engine manufacturer naturally favors *their* products. They don't evidently make turbines, such as do the hobbyists you mentioned or the high-tech (multi-stage) turbine manufacturers such as Azmark Aero Systems (formerly M-DOT), who can make turbines with...
  3. smi3th

    200,000rpm 20Hp gearbox

    I understand the advantages of an A. C. generator, and also the disadvantages of a power-processor driving a not-that-small high-speed 10-20 hp motor via a high-frequency polyphase inverter. I have designed power processors, from tens of watts to hundreds of kilowatts. It's not a trivial...
  4. smi3th

    200,000rpm 20Hp gearbox

    I need the gearbox to work *reliably* for four hours. If I know it became unreliable after, e. g., 10 hours, I will just replace the gearbox after each four-hour operational cycle. I could live with that.
  5. smi3th

    200,000rpm 20Hp gearbox

    that's very helpful. Thank you, all. I had no idea that "model" airplane hobbyists had gone to such extremes. I see that these are all single-stage turbines, and their fuel efficiency is about three pounds per horsepower-hour. These also seem to be a nominal five horsepower, and so I would...
  6. smi3th

    200,000rpm 20Hp gearbox

    I hope this is a good place to ask this question...I'm a physicist that got into something where I don't have any practical experience; A friend of mine, an automotive transmission-designer, recommended this website. I have an engineering problem that can be solved by a small turbine engine...

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