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  • A new engine for fall---

    My heart rate and blood pressure have returned to normal, now that I am completely finished with my version of the Nemett Jaguar. I don't WANT to build anything else until fall.
    Then I want to build a totally new engine that is not a modified version of some one else's design. Oh, it will still have all the standard things, --piston, con rod, crankshaft---you get the idea.
    ---I am very interested in the gearless engines, just because of how different they are. I have also learned from Malcolm Stride and whoever (Mr. Webster, I assume) designed the Webster engine. I really like that cantilevered crankshaft design as used in the Lynx and the Webster--it so greatly simplifys the crankshaft manufacturing. There is also the big plus that with a gearless type engine and an "atmospheric" intake valve, no camshaft or camshaft bearings are required.
    I won't build another engine with a wet sump and splash oiling, because it is simply too difficult to keep track of the oil level once the sump is all buttoned up. I have been doing some research, and in addition to "sealed for life" ball bearings, one can also purchase "sealed for life " needle roller bearings and sleeves. In my mind, these would be almost perfect--sealed ball bearings for the crankshaft and sealed needle roller bearings for the big and little ends of the con rod.
    I probably won't try and use cast iron rings again. I have proven to myself that yes, I can make them, but it is a very "chancy" operation, and even when working at their best, they don't give the compression that a Viton o-ring does.
    I have proven to myself that old style points type ignition is both cheaper and far less susceptible to damage than the new electronic ignitions, but they are bulky and take up a lot of room compared to a magnet and pick-up, so the jury is still out on which I will use.
    --I like the hit and miss style of engines, because there is a bit more neat mechanism available to see operating, and the real big plus is that these engines run extremely cool because of the fact that when in "miss" cycle they constantly circulate room temperature air thru the cylinder which keeps it cool.
    --I would use a cast iron cylinder, and possibly a cast iron piston, as this will be a slow revving engine so the inertial weight of the piston won't be that big a deal.
    ---After designing and building the "Rupnow Engine" and seeing that it wants to levitate at any speed above 50 RPM I will definitely find a way to balance the crankshaft with bolt on weights.
    That all for now. If any of you fellows know of any real nifty "gearless" mechanisms, please let me know. I have plans here for the Philip Duclos style gearless engine, also for the old "star wheel" type as seen on full size hit and miss engines, and the nifty one that Myrickman posted on Modelenginemaker forum. I would be interested in any other gearless designs that I am not aware of.----------------Brian rupnow
    Brian Rupnow
    Design engineer
    Barrie, Ontario, Canada

  • #2
    man, you are ADDICTED!!!!!!!!!!!!!!!! Lol

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    • #3
      An elbow engine perhaps?
      Precision takes time.

      Comment


      • #4
        Maybe try something more exciting, like a jet engine.
        Location: Long Island, N.Y.

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        • #5
          With an afterburner.
          Location: Long Island, N.Y.

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          • #6
            Maybe I'm retrograde (I think that's the word.) The engines which interest me predate the jet engine by about 100 years!!
            Brian Rupnow
            Design engineer
            Barrie, Ontario, Canada

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            • #7
              Brian,
              My Olds is a gearless design, using a star-wheel type of "cam". See: http://www.deboltmachine.com/id2.html for details, but no closeup pics. Can send those to you if necessary.

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              • #8
                Brian, if you want to build something a little different take a look at the principles of the monosoupape aero engine of WWI, just one cylinder of course. It has ports for induction and a single valve for exhaust.

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                • #9
                  From a total off-the-wall brainstorm, I came up with a few crazy ideas.

                  As I contemplated alternative fuels, such as vegetable oil, I tried to think of other ways to cause a confined explosion, and I considered the principle of a gun. So you might be able to rig up an automatic loader that would take blanks from a belt, like a machine gun, or even pick them from a loose pile, insert each one into the end (breech) of a cylinder, lock, and fire. The bore would have a piston instead of a bullet, and would connect to a crankshaft.

                  This might cause too much pressure too quickly to be practical, but perhaps each blank could cause a larger chamber to fill with pressurized gas, and then that would be used like a steam or compressed air engine. It could be similar to a hit or miss engine in that a low pressure in the reservoir would cause the next charge to be inserted and fired. Practical - no, loud and annoying - probably, but unique - BINGO!

                  For a small model engine, maybe caps as used in toy pistols could be used, if you can still get them.

                  I have heard that a gas engine can be modified to "burn" water by replacing the spark plug with the klystron of a microwave oven, and using it to vaporize a small amount of water that has been injected into the "combustion" chamber or cylinder. Of course you can't extract more energy from water than you use to vaporize it (or to create oxygen and hydrogen), unless somehow you can create even a tiny fusion reaction. Otherwise, this will really be an electric motor, although not using the traditional electromagnetic methods.
                  https://answers.yahoo.com/question/i...5214112AAVet77
                  http://www.keelynet.com/energy/microeng.htm
                  http://lofi.forum.physorg.com/Microw...gine_5884.html


                  Perhaps there are other materials that could be used as fuel. What about using dust (coal or dry grain, like flour) to cause an explosion:
                  http://en.wikipedia.org/wiki/Dust_explosion

                  Or could you use Ammonium Nitrate, or even ammonia? There was a hydrogen car that ran on 95% ammonia:
                  http://www.greencarcongress.com/2007...en_engine.html
                  http://www.voxsolaris.com/nh3driver.html

                  Well, enough craziness for one post. Maybe this will generate some useful ideas.
                  Last edited by PStechPaul; 07-16-2014, 08:37 PM. Reason: microwave water engine links
                  http://pauleschoen.com/pix/PM08_P76_P54.png
                  Paul , P S Technology, Inc. and MrTibbs
                  USA Maryland 21030

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                  • #10
                    There have already been engines that used gunpowder for fuel.
                    Kansas City area

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                    • #11
                      Hi Jim--I have some good close ups of Star wheels in operation from Youtube. ArtfulBodger, thank you for the suggestion, but I don't want to get into something too difficult. All that does is frustrate me and make me crazy. I think the monosoupape might be a bit beyond what I am capable of. PStechPaul--I want to build an engine, not blow the north end out of Barrie.----Bye the bye---Philip Duclos designed an engine called the Maverick, which has a really strange gearless mechanism on it, but I can't see much of it from the one picture posted on the internet. If anybody has more info on that, please let me know.---Brian
                      Brian Rupnow
                      Design engineer
                      Barrie, Ontario, Canada

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                      • #12
                        Star wheel mechanisms and elliptical cam mechanisms both work great on gearless engines full size, but neither of them scale down very well to model engine size.
                        Brian Rupnow
                        Design engineer
                        Barrie, Ontario, Canada

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                        • #13
                          I think a combination eccentric and desmodromic action would be interesting. You could have manually adjustable valve timing and lift. The mechanics cause me a headache however.

                          Gearless makes for a challenge.
                          Gene

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                          • #14
                            http://en.wikipedia.org/wiki/Gunpowder_engine

                            And a "flour power" engine has been attempted:
                            http://www.smokstak.com/forum/showthread.php?t=10953

                            And a patent:
                            http://www.freepatentsonline.com/7201781.html

                            Sorry, other posts while I was posting. I still think some alternative fuels concepts could be interesting.

                            The compressed air / steam engine I am building will have a sort of "Geneva Escapement" valve actuator:



                            http://mechanicaldatahelp.blogspot.c...echanisms.html

                            https://www.youtube.com/watch?v=febqyJDy8Ao
                            Last edited by PStechPaul; 07-16-2014, 09:21 PM.
                            http://pauleschoen.com/pix/PM08_P76_P54.png
                            Paul , P S Technology, Inc. and MrTibbs
                            USA Maryland 21030

                            Comment


                            • #15
                              Originally posted by brian Rupnow View Post
                              Maybe I'm retrograde (I think that's the word.) The engines which interest me predate the jet engine by about 100 years!!
                              Hmmmm.

                              I'd have to look up what, if any, kinds of IC engine existed in 1835 or so........
                              CNC machines only go through the motions

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