Jump to content

danny_galaga

Members
  • Posts

    1,766
  • Joined

  • Last visited

  • Days Won

    16

Everything posted by danny_galaga

  1. 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!
  2. 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.
  3. I guess they were thinking of ammonia when they typed it?
  4. Doesn't seem like they were in a circuit though.
  5. https://generalaviationnews.com/2025/03/26/cessna-172-runs-out-of-fuel-during-flight-lesson/
  6. I still shrug in your general direction 🤷‍♂️ 😄
  7. Maybe because this is an aviation forum 🤷‍♂️
  8. The end game is not to be burning it.
  9. For now, that might as well remain diesel. Let's save fossil fuels for necessities like this, and use electric where we can.
  10. 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.
  11. 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).
  12. 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.
  13. Did someone say Ace of Base?
  14. Nice. That'll definitely help while the engine is running since the airflow will keep the aluminium cooler than the exhaust pipe 😎
  15. 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.
  16. 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.
  17. Hey! My hand is famous ☺️
  18. 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?
  19. Just read that too. Why turn off ads-b on a training flight? Something you'd think you'd want in a crowded airspace.
  20. Oh wow. I had always thought it was illegal 😯
  21. What terrible ironies the universe throws at people 😞
  22. Crossed my mind too. Not necessarily incorrectly set, but out of calibration. Cracked static line or something.
  23. Guys, I'm sold! Will still be a while but when it comes time to upgrade my prop I'm getting a Bolly for sure 🙂
  24. As far as I'm aware, blades coming off in ultralights is pretty rare. But it was in the back of my mind when I went for my good old fashioned laminated single piece wooden propeller ☺️
×
×
  • Create New...