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danny_galaga

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Everything posted by danny_galaga

  1. danny_galaga
    You've compelled me to look it up. Seems it's a variation on a compressed air motor, but using liquid nitrogen that is heated to become pressurised gas https://en.wikipedia.org/wiki/Liquid_nitrogen_engine As far as I can tell, this is the only car to have used a liquid nitrogen engine
  2. danny_galaga
    Of course if you miss out on nitrous oxide, it's no laughing matter 😀
  3. danny_galaga
    And of course potassium nitrate if ya wanna get a rocket up ya 😀
  4. danny_galaga
    I forgot to mention trinitrotoluene. Plenty of bang for the buck 😀
  5. danny_galaga
    How about ammonium nitrate? That'll give you a hurry up!
  6. danny_galaga
    Unfortunately there's a two way loss that is hard to get around - compressing the air generates lots of heat. Decompressing it, eg driving a piston engine, absorbs lots of heat, potentially freezing up the engine. This was definitely a problem with the model CO2 motors I used. You would actually get ice on the pipes!
  7. danny_galaga
    In fact, I think it was Peugeot that was experimenting with compressed air for a hybrid. Compressing air during braking. I was very excited about the idea, because it's much simpler than batteries. Unfortunately, as you say, huge inefficiencies compressing the air. They dropped the idea.
  8. danny_galaga
    I guess they were thinking of ammonia when they typed it?
  9. danny_galaga
    Doesn't seem like they were in a circuit though.
  10. danny_galaga
    https://generalaviationnews.com/2025/03/26/cessna-172-runs-out-of-fuel-during-flight-lesson/
  11. danny_galaga
    I still shrug in your general direction 🤷‍♂️ 😄
  12. danny_galaga
    Maybe because this is an aviation forum 🤷‍♂️
  13. danny_galaga
    The end game is not to be burning it.
  14. danny_galaga
    For now, that might as well remain diesel. Let's save fossil fuels for necessities like this, and use electric where we can.
  15. danny_galaga
    It's WAY more efficient to store electricity than create hydrogen. That's because the electricity just gets put straight into the grid when needed. Hydrogen needs to be compressed, transported etc. "Multiplying these individual efficiencies finds that just over a third of the original energy input into the cycle remains available for work by its end – a cycle efficiency of about 37%, meaning 63% of the original energy has been lost." https://h2sciencecoalition.com/blog/can-electrolysers-of-the-future-solve-hydrogens-efficiency-problem/ I think it'll still be worthwhile to make SOME green hydrogen, since you need to for industrial purposes other than as fuel.
  16. danny_galaga
    Green hydrogen just means you've used only renewable energy to electrolyse water. Splitting the molecule into one O and two Hs. The problem is, water is actually quite a perplexing molecule. For instance, most materials shrink as they get colder and expand when they get hotter. Water shrinks as it gets colder, to a certain point. Then as it gets even colder, it starts expanding again! It's also quite tenacious. And there really doesn't seem to be any way of not expending a LOT energy to split it. Really doesn't seem to be much reason to make green hydrogen, other than where you might need it for some industrial purpose (chemical for instance) without putting carbon in the air by getting it from fossil fuels (blue hydrogen).
  17. danny_galaga
    I agree with one-track. Hydrogen fuel cell is a pipe dream. Mercedes have/had been mucking around with it since at least the early 90's. As a kid I was enamoured with the idea. but EV tech has slowly but surely surpassed fuel cell tech. You just can't get around the transport costs and inefficient manufacture of green hydrogen.
  18. danny_galaga
    Did someone say Ace of Base?
  19. danny_galaga
    Nice. That'll definitely help while the engine is running since the airflow will keep the aluminium cooler than the exhaust pipe 😎
  20. danny_galaga
    If you are referring to my comments about trade wars, despite all the bluster from the Orange Guy, tariffs on Chinese products will be 10%, while most of his allies cop 25%. That's products to the US of course, but there are many ramifications for other countries, including how particular companies fair in the new environment. If Americans buy more zongshen because they've become an even more enticing proposition, that could mean zongshen have more income to streamline their production even more.
  21. danny_galaga
    China is fast becoming like Japan in quality. I think have to remember you get what you pay for. If you go on Temu and buy a two dollar sweater that catches on fire, well.... But if you are buying a quality product, there's no reason it can't be Chinese. The price is a sticking point for now. But we'll see how the coming trade wars effects Rotax prices compared to zhongshen prices. The current bizarre US regime might be a silver lining for high end Chinese products.
  22. danny_galaga
    That's gold 😄
  23. danny_galaga
    Hey! My hand is famous ☺️
  24. danny_galaga
    Yes, when I first learnt to fly and I was taking some friends for a flight, I was quite high from an airfield I wanted to do a touch and go on. Piper warrior. But I forgot to warm through the motor regularly. When I accelerated to go, the engine spluttered and had quite a hard time because of the cooling. That's just at idle. If it needed to be started, then who knows?
  25. danny_galaga
    Just read that too. Why turn off ads-b on a training flight? Something you'd think you'd want in a crowded airspace.
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