Comments by "Martin L" (@martin09091989) on "Real Engineering" channel.

  1. Yea thats because the projectile itself spins the same rate as the centrifuge, who could have guessed? 🤷‍♂
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  2. Very good video! But the Spin Launch project itself is just gloriously stupid!! I know it ment to be serious, but for me it was more of a satire!!! 🤣 "All hail to the carbon fibers!"🙌
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  3. I have to Intervene on the degradation of lithium ion batteries! The cycle dependent degradation you mantiont is not correct, on paper it's more like 10% degradation for 1000 cycles at more or less 100% discharg rate! At 80-90% discharge it goes up to something like 1500 to 3000 cycles for 10%, and then you have 90% of the initial capacity left. Now sure that's for ideal conditions, if you have them sit long time fully charged or bad temperatures you get worse! In practice those numbers are pretty spot on! I have a little solar tracker with just 1 18650 cell on, the tracker consumes so much power that the cell is barley enough to go to the next sunny day. I have that running for now 3 years, and the cell Hase approximately 500 cycles with 80-100% discharge behind it, and alot more with partial discharges, even mutiple over discharges, I checked the capacity multiple times over the years and it hase degraded just 10% to it's initially capacity. And I have an e bike for 2 years now, I drove it for 1 year continues to work every day and half year in the summer, for every trip I drained it 90% (66km, and 400 meters elevation, 350 cycles) and I have tryed several times after my trip home, how much range is left by driving a short trip around my village, and noticed a decrease of 5km in range! And the track around my village is relatively low in alleviation (50meters for one round) So it's less then 10% degradation even with the worse of a comparison between range and power needed. For example, on relative flat terrain like the trip around my village, this bike drives 160-180km. So the 10% for 350 cycles is definitely on the conservative side! 20% at under 1000 cycles is even in practice not realistic! But I agree, lithium ion batteries are not suited for stationary applications! Way to much recourse and energy goes into ther production to be viable for such a task! Edit: my tracker batterie is also fully charges during 3 months in summer, and I noticed that most of the degradation did come from that! In normal cycling it had no measurable degradation!
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  4. You are wrong with the start procedure! You can´t use the actual turbine to start the engine because you need the backpressure from the compressor to use it. On a still stand, the air would simply go out both end of the engine and do near to nothing. The little bit of inertia you could use wont cut it. It would also be very difficult to duct the air lines into the hot end. Most biger engines use an external air starter on the pto gearbox. The air for the starters are tapped of off the compressor from the apu, or a starter cart that hase one in it. Some smaller engines like helicopter turbines and the apu´s use plain electric starters.
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  5.  Phoenix 𝙾𝚙𝚎𝚗 𝙼𝚢 PROFILE  oh nice, chat bots on YouTube!
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