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Sarge
That being the case...
Tue Aug 8, 2017 06:59
2601:982:8200:5f50:8c16:3fbe:f27e:7cff

"I love them"

...you should stick with that as a story element. However...

I raise the question from a grave suspicion there must be a reason why, with all the advantages of weight and power output, two-stroke wasn't pursued seriously anywhere. A predjudice in one engineering community, if it exists, would not preclude another from pursuing it openly, an example being the Jumo diesel. Here we see a universal exclusion, so I can't help being suspicious there is a dam good reason and I don't know what it is. I do suspect altitude variations, though.

An ultralight really isn't an example of robustness of principle as they are extremely limited in altitude, both in principle and by law, so unaffected for the most part. They sublect their engine to no more of a change in barometric pressure or air density in a running cycle than running a Saab up a mountain.

Even today with modern aero engines in general aviation, no-one goes there. Why?

Now that I've thoroughly pissed you off, here comes the fun for you. Once you find what it is (and predjudice isn't good enough) and know the limitation that killed two-cycle (even today) in aero use, have Toad solve it at least experimentaly just as you would. If it is variable scavanging under variable pressures and densities as altitude changes, for example, then Toad can solve it experimentally with some concept known then, such as the addition of a mechanical forced scavanger based on forced-draught as used in some steam applications.

Know that I'm taking a conservative position in this to get you thinking and arguing your point and your love with a voracity that convinces me. I remember well a book called "Steambird", that had an aircraft of great capability as the instrument of a main character. You guessed it, a huge lover of steam power was the author. Couldn't get past the physics nor could I get past chapter 3.

Don't want that happening to you, so run with it but argue it well, perhaps even Toad loses after arguing it well. My council, though, is be dam sure you're right and there is no technical limitation; no "Steambird".

  • Theres a definite bias - mike, Mon Aug 7 19:33
    Amongst engineers against two strokes and its largely based on a chimera, thats to say the experiences from the past when technology wasnt up to the task. Since they do twice the work they have half... more
    • That being the case... - Sarge, Tue Aug 8 06:59
      • Steambird - mike, Tue Aug 8 09:53
        I have that book too. I know some British inventor did fit a steam engine into an airframe tethered to a short stretch of rail which developed enough lift to break free - if memory serves? Sir George ... more
        • For bikes and cars... - Sarge, Tue Aug 8 11:38
          ...I'm with you on two stroke being viable, and in some cases advantageous. Can't have rallyed a Saab 96 without marveling. I well remember the two vs four schools in bikes, though I understood my... more
          • Well that just makes things better - mike, Tue Aug 8 14:15
            Do you know that I hadn't considered those aspects of the changes in atmosphere that you spoke about? Should have done though but I simply dismissed it as a problem similar to that of changing... more
            • That's probably wise, BUT... - Sarge, Tue Aug 8 15:59
              ...you might not give up on the debate as a good character development tool. I suspect Colin, being the automobile fan, is a four cycle guy, and might hold user prejudices to that predilection. Then... more
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