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

Was messing with the engine this morning and thought with the propeller pitch load it Runs fairly slow. I tried the burner the model came with as its a bit larger and gained about 10% speed but I wanted More.
    Just for fun I Nicked a light wooden gear from a marble run I am currently building, I was curious if the wood gear would have enough mass to allow the engine to run, it does! And the result is MORE than doubles the engine speed!...lots of fun but as I ran the engine Fast, I discovered the air cooled engine Does rely on the air movement from the propeller to carry the heat away. The engine will run fast And smooth with the gear flywheel for apox 1 min than begin to slow down and surge. If I let it cool for a min it will go fast again and the cycle repeats.
  I am going to look thru my airplane stuff for a propeller with less pitch but all this tinkering got me thinking a 3 or 4 blade model aircraft propeller might make an interesting "Baker fan" variant?

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