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Miniature radial engine

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  • Miniature radial engine

    I'm really enjoying seeing the variety of modeling skills by the members here. Years ago, I took up a hobby that has always been popular especially with the British... home metalworking, using lathes, mills, and other machine tools.

    Being an airplane nut, I have always admired the large air-cooled radial engines of WW2. They make a beautiful, unique sound that cannot be mistaken for an inline engine, and they proved exceptionally durable in combat. I decided to create an operating radial in miniature, and mount it on a "test stand" that would allow running demonstrations.

    The bulk of the engine is aluminum, and the heads, rocker boxes, and rear cover were sand-cast aluminum. The cylinders are steel; rings of cast iron.

    For run-in purposes, and to check timing and function, near the end of the project, I mounted the entire engine in my lathe:



    The stand and mounting took a while, but I am pleased with the result:



    It is not a copy of any particular engine... it has a vague similarity to a generic 9 cylinder Pratt & Whitney engine from the 1930's.

    Anyone else into metalworking? Steam engines, etc?

  • #2
    Wow. That is just fantastic.
    In the realm of spirit, seek clarity; in the material world, seek utility.

    Leibniz

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    • #3
      Very cool. Do you have any videos of it in operation.
      For Gallifrey! For Victory! For the end of time itself!!

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      • #4
        Amazing skills!

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        • #5
          1St class ,well done;)

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          • #6
            That looks awesome, how much mW does it make?
            When our perils are past, shall our gratitude sleep? - George Canning sigpic

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            • #7
              Thanks for the kind words. I've never measured power output. It swings a 20" variable pitch (ground variable) prop at about 5,000 RPM max, and will idle around 800. In terms of power to weight, it is nowhere near the types of commercial engines guys are using on giant scale R/C airplanes, but it would probably be able to haul a Stearman or similar around.

              I know I've got some movies somewhere, I'll try to dig them up.

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              • #8
                Excellent work!

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                • #9
                  Fabulous engineering. A work of art:)

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                  • #10
                    Originally posted by Chogy View Post
                    Thanks for the kind words. I've never measured power output. It swings a 20" variable pitch (ground variable) prop at about 5,000 RPM max, and will idle around 800. In terms of power to weight, it is nowhere near the types of commercial engines guys are using on giant scale R/C airplanes, but it would probably be able to haul a Stearman or similar around.

                    I know I've got some movies somewhere, I'll try to dig them up.
                    Really? Wow am surprised, Iv seen some really expensive RC crafts but never knew they are using engines that generate that sort of power. Your engine sounds pretty powerful too, I was assuming it to be one of those miniature 5hp scale models
                    Last edited by Knaur Amarsh; 09 May 09,, 08:38.
                    When our perils are past, shall our gratitude sleep? - George Canning sigpic

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                    • #11
                      Originally posted by Knaur Amarsh View Post
                      Really? Wow am surprised, Iv seen some really expensive RC crafts but never knew they are using engines that generate that sort of power. Your engine sounds pretty powerful too, I was assuming it to be one of those miniature 5hp scale models
                      That's OK Knaur. I gues the point I was trying to make was that I didn't have ultimate power/weight as a goal, at all, and during construction, did not work hard at keeping the parts lightweight. My primary goal was ease of starting and reliable running. A low idle, too... Radial engines do sound cool at idle.

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                      • #12
                        Originally posted by Chogy View Post
                        A low idle, too... Radial engines do sound cool at idle.
                        Now then, can't be a tease and get away with it Post away a vid or sound file to let us hear it sing.
                        When our perils are past, shall our gratitude sleep? - George Canning sigpic

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                        • #13
                          I will try and track some down... its been a while since I messed with the recordings. I think I have some stashed somewhere.

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