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Tandem Double-Acting engine in HSM

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  • Tandem Double-Acting engine in HSM


    Just got my new May/June issue of Home shop Machinist in the mail today. I was actually pretty excited to see the cover with the photo of the tandem double-acting engine. Before I turned to the article I was beginning to think this was like reading Model Engineer that is until I turned to the article and discovered this was not a construction project at all. I was disappointed. I was thinking about how you have had articles on making model concrete mixers, diving board pedestals and a hand pump for the kitchen, why not a tandem double-acting engine?

  • #2
    When Doug Kelley sent in his article, I had thought the engine would be an inspiration for those readers in the IC community. The photography is first rate and the craftsmanship is top notch.

    Currently, I'm trying to get Doug to cover more of the construction details for a future installment.


    • #3
      you got a full cutaway drawing and a picture. what more do you need?


      • #4
        "you got a full cutaway drawing and a picture. what more do you need?"

        Details of the cams and valves.
        North Central Arkansas


        • #5
          Just got my HSM today. Beautiful work, both in design and implementation. Very fitting for an HSM cover.

          I have recently finished an engine of similar complexity, and I can add that there is more to building one of these than a cut away drawing, unless you want to do a lot of design. I have been interested in possibly writing an article on my engine - a scale model Corliss, but there have been many construction articles. I thought of writing more on the lines of the tooling and special fixtures needed to hold the wierd castings. What would y'all be interested in reading?

          Check out the Corliss:


          • #6

            Your'e thoughts on an articl about the tooling and special fixtures sounds good. I may never take the time to build an engine, but the exposure to methods could be useful on other projects.
            North Central Arkansas


            • #7
              There is an old book out there called A Manual of Machine Drawing and Design by Lowe
              Funnily enough I have just looked on and there is only one listed at $25 here in the UK.
              I find this funny as you trip all over the damn things here in S/H book shops, I think I have about 3 copies.

              Anyway YET again I digress.

              In the back of this book is a set of drawings, full set BTW, for a triple compound launch engine designed by Watchout, Splinter and Sink or some such nautical engineers, if it's important I can look it up.

              I have often looked at these and thought they could be scaled to any size.
              They could be copied and posted as scans as the book was pubished in 1894 so copyright has long sunk.

              Incidently the drawings are there as an apprentice exercise. Instruction go " Draw full size ......
              My mind boggles at the amount of work behind this, 20 sheets of A---000 paper, three hundredweight of 2H pencils and rubber off an eighteen wheeler, no wonder they had to do 7 year apprenticeships, it would have took 2 years for the GA.

              John S.

              Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.


              • #8
                and here I haven't gotten mine in the mail yet
                Forty plus years and I still have ten toes, ten fingers and both eyes. I must be doing something right.


                • #9
                  I haven't gotten it either... and usually mine comes fairly early


                  • #10
                    I'm building a fore & aft compound,double acting, from Mr Kouhoupt's plans.
                    Yes! lotsa thingies, wouldn't want to attempt it from a cutaway.
                    If I ever finish, will try to summon enough courage to attempt a Corliss.


                    • #11
                      The interesting thing about DA tandem engines, they had water cooled pistons. Slip tubes [think trombones] swivels. Must have look ed like a p**d grasshopper. Jim



                      • #12
                        Have you got any more info on the engines you refer to? I have never heard of a water cooled steam engine piston (but willing to be surprised!)
                        Diesel engines commonly used water cooled pistons (or oil cooled nowadays), they had some interesting jointed pipework getting the water in and out. One I have seen had the water returns gathered in one place so temperatures/flows could be monitored.


                        • #13

                          An article on the fixtures and machining methods would be very interesting. I've yet to build a project from HSM/MW (half the time I don't know what the finished project is actually for) but read the articles for just such tips.




                          • #14
                            It's not a steamer, but a IC gas engine.
                            Green Bay, WI


                            • #15
                              Pete.. Yes its a IC engine. Drawings in an old ICS handbook circa 1920s. Also had Gnome rotary WW1 aero[sic] engine w/timing dia. Sorta 2/4 cycle! Inlet ports in lower cyl. o
                              One valve in head. Power stroke-valve opens before c-case ports are opened. The fuel mixture was so rich it didnt explode! usualy. Piston goes up to tdc to scavange, down for intake, before reaching c-case ports VALVE finaly closes making vacume for rich mixture to rush in. Piston gos up on comp. stroke, BANG.Ifigger 720* valve event. Did I mention the engine spun around the crank which was fixed to the aircraft,which is the intake man. for themixing valve for air/fuel. They also had 2 valve emgines,at 1 18 cyl. 2 row geared. engine turned rt.-prop turned lt. 900 rpm big prop. L H JIM