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  1. Etna

    Electric planes

    I think this first flight is a great achievement for all those involved. Nonetheless, the design is still fatally flawed since they completely miscalculated realistic empty weight and battery weight fractions required to maximize range as much as possible, considering the limitations of pure...
  2. Etna

    Electric planes

    In a hybrid system it is the other way around. Turbines are best used for energy intensive parts of the flight while batteries are used for power intensive parts. So you use batteries for takeoff and climb, and smaller turbines to extend range in cruise. A pressurized electric aircraft requires...
  3. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    The Belgian Government has obviously rescinded that decision since the invasion of Ukraine, asking on March 18 the operator (French company Engie) to keep two nuclear powerplants open for at least another ten years beyond 2025. They are looking at ways to keep more open but it's difficult...
  4. Etna

    "New" Sources of Tesla 'OEM,' Tesla-like, and/or Third-Party CCS1 Adapters

    Thank you @tps5352 for putting this together. After a year of waiting, I finally gave up on Tesla and just ordered from A2Z. Here in Quebec and outside of urban centers, the Tesla Supercharger network is widely trailing the Circuit Electrique charging network in price, geographic coverage...
  5. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    The train yard is visible here: Google Maps
  6. Etna

    Electric planes

    It does, especially liquid hydrogen (cryogenics aka rocket technology). It is technically feasible for long range, unlike battery powered aircraft. Pressurized hydrogen on the other hand incurs a weight penalty, and especially a volume penalty, that makes it only marginally better than battery...
  7. Etna

    Electric planes

    Well, I have been working on an electric aircraft design for a few years already and I wish I had known this earlier. Thanks for allowing me to learn something new, and back to the drawing board I guess.
  8. Etna

    Electric planes

    I have not. I am not familiar at all with that category of airplanes, as a pilot or aero engineer.
  9. Etna

    Electric planes

    Beechcraft built and sold over 17000 Bonanza, far more than Boeing sold 737s. And it is still in production.
  10. Etna

    Electric planes

    Thanks, yes a typo, I meant the 747-100SR.
  11. Etna

    Electric planes

    Let's try with a recap of mine. My job for the past 25 years has specifically been the design of new airplanes, jets and turboprops. My answers may be sometimes a bit obtuse or overly complicated, and not always correct, but I will try my best to explain what the deal is. This fixation on...
  12. Etna

    Electric planes

    We probably have common acquaintances, or even know each other. I would say the same about @MadScientist23 as we all know this is a small world. Yes by short range I should maybe point more specifically to regional turboprops to which future all-electric airplanes bear more resemblances. Short...
  13. Etna

    Electric planes

    Right, keeping in mind that I "solved" a problem that does not exist in the first place. Short range airplanes already account for a landing weight at or very near takeoff weight. However, to get any meaningful range, electric airplanes must be designed like long range airplanes when it comes...
  14. Etna

    Electric planes

    No it would have zero effect. Let's say you want to carry 10 passengers or a payload of 2500 lb. And you have 2500 lb of batteries. Plus you consider an empty weight mass fraction of 50% (typically it is 60% but let's keep the calculations simple). Then the takeoff weight would be 2500 lb...
  15. Etna

    Electric planes

    All short range airplanes, from crappy to outstanding, have their landing weight near their takeoff weight, it is just a fact and primarily a result of different fuel mass fraction requirements at max payload (10%-ish versus 25%-ish) and typical mission fuel burn. The 737-800 is not a short...
  16. Etna

    Electric planes

    Sure but the 737-800 is not a short range regional turboprop aircraft like electric airplanes can only ever pretend to be. All short range regional airplanes have their max landing weight equal or pretty close to their max takeoff weight. Any case you could design a 737-800 having its max...
  17. Etna

    Model S Plaid hits OVER 200mph for first time EVER

    This video below without Fwed's ramblings has been posted by the owner of Ingenext. They do these kinds of Tesla mods, such as the boost module, as a business for Model 3 and Model Y. It was just a matter of time before they would start tinkering with a Plaid S.
  18. Etna

    Electric planes

    It's actually a pretty good overview with nicely presented charts, I did not find anything in there that needs debunking. Conventional airplanes burn less fuel per typical passenger load than a car, so it's no surprise that electric airplanes can do the same. One could argue what those typical...
  19. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    The SEC filing disclosing the split is available here: https://www.sec.gov/Archives/edgar/data/0001318605/000156459022022992/tsla-pre14a_20220804.htm Reasons for the Proposed Amendment The primary purpose of the Authorized Shares Amendment is to facilitate a 3-for-1 split of our common stock...
  20. Etna

    Electric planes

    Of course, as long as it is a clean sheet design rather than a retrofit or incorrectly sized aircraft. It's actually super simple. Say you want to carry a payload of 2500 lb, you set aside 30% of the takeoff weight for batteries and 57% for the aircraft empty weight (no small or medium sized...
  21. Etna

    Electric planes

    For eVTOLs it's on a similar scale as a semi truck, at the low end of the Megawatt Charging System specifications, so definitely not an issue. For larger regional airplanes operating short routes, which would represent the top end of battery powered propulsion feasibility, count about three to...
  22. Etna

    Electric planes

    Acceptable is not the same as initially acceptable. While the yearly improvements on energy densities are frustratingly slow, improvements on life cycles (and economics) have been comparatively quite significant. I am hearing 5000 cycles above 300 Wh/kg after the 2030's which are not that far...
  23. Etna

    Electric planes

    Aerospace grade batteries are already available today well above 300 Wh/kg from several companies, including Zenlabs at 340 Wh/kg, incidentally 35% owned by Lilium. Aerial Vehicles — Zenlabs These batteries cost an arm and a leg (North of 1000$/kWh), and don't quite have the same life-cycles...
  24. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Liquidated my very small ARKK holdings at 60% loss and bought some more TSLA with it. Now 100% all-in TSLA, up from 99.9998%. That will teach me about diversifying.
  25. Etna

    Electric planes

    It does have an impact but for short range aircraft it is only a negligible range loss between range calculated with weight reducing with fuel burn and range calculated with constant weight. The reason that the weight penalty does not have a significant impact for short range aircraft flying at...
  26. Etna

    Electric planes

    You are mixing up power and energy. Takeoff power is very high but lasts only about one minute. Climb power is high and lasts a few minutes. The electric aircraft I am working on spends 8% of the total kWh on takeoff and acceleration to climb, 42% on climb to cruise altitude, and 42% in cruise...
  27. Etna

    Electric planes

    The weight penalty of adjusting gear life cycles to this criteria is below noise levels. Other design drivers specific to electric propulsion (fuel/battery weight fractions at max payload, etc.) have an impact on takeoff weight that is several orders of magnitude higher than that.
  28. Etna

    Electric planes

    What are you talking about? All the airplanes I have flown are designed to land with a full tank. Or look up any regional turboprop specifications, maximum landing weight is generally very close to maximum takeoff weight. As in 95% full tank.
  29. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    @Krugerrand the cat on the right was liked on Twitter by Elon tonight, this is is very troubling.
  30. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Love that image too and could not find its source either but in the mean time I digitally reconstructed this image from the tweet (contrast/color/sharpness enhance and artistically cloned the missing corner).
  31. Etna

    Lots of refinement between 2020 and 2022 Model Y

    You don't have to. You can use your cellphone as Wi-Fi hotspot and set it up in your car to remain active while driving (a fairly recent feature). I am listening to Spotify all the time without premium connectivity. This is far better than streaming over Bluetooth, since it sounds much better...
  32. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    That third quote is not from FORD's CEO but is (holds nose) actually an "Electrek's take".
  33. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    It does make plenty of sense actually.
  34. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    2021.44.30.7 has been widely distributed in Canada. It was pushed to my Model Y yesterday (although I am not affected by the issue) and it is the main social media topic of discussion among owners here.
  35. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    FWIW the text below the date means "coming soon, please look forward to it". So it gives no hint.
  36. Etna

    Random Subsonic Boom or Bang

    Same here, exactly as you describe. A very low frequency "thump" that you can nearly feel in your body, always promptly followed by an exhalation (like a whoosh) from the front air vents for a second or two. Nothing to do with compressors or contactors which make entirely different and distinct...
  37. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Closing at 5% up and no one even mentions it.
  38. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    The largest in terms of capacity is Hyundai Ulsan Factory at 1.6 million. VW is the largest by area.
  39. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Big price increases across the board here in Canada on Model 3 and Model Y tonight. Model 3 no longer qualifies for the $5000 CAD federal rebate which makes the change even more significant. Tesla increases Model 3 and Model Y prices in Canada again, making the entry-level Model 3 ineligible...
  40. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    New SpaceX motivational video, very fitting for today's price action:
  41. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Even more satisfying than joining the Teslanaire club is when your wife also does.
  42. Etna

    Electric planes

    Not yet. They are aiming for a Supplemental Type Certificate end of 2022.
  43. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Not sure the scale of FSD effort has been disclosed before: - Hundreds of engineers in both software & hardware - Over a thousand data analysts - Billions of owner miles
  44. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    To my eyes the new Model X looks externally identical besides some minor cosmetic differences. Here is another angle.
  45. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    I was parked next to a Model X Plaid a couple of days ago here in Quebec City. Car has dealership plate and is here apparently to "experience" our trademark winter and potholes. Vin #325791
  46. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    Trademark is invalid, as made public domain months earlier: Wiki - Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable
  47. Etna

    Wiki Model X Order/Delivery Tracking - Google Sheet

    I was at the service center here in Quebec City today, and happened to park right next to... a Model X Plaid! Definitely surprised to see one here already while so few have been sighted even in California. It has the X dealership plate for test drives, so it's not one to be delivered to a...
  48. Etna

    Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable

    The photo is from the commencement ceremony for his Honorary Degree in Engineering and Technology at Yale in 2015. SEAS Celebrates Class of 2015, Honors Innovators Elon Musk and Dean Kamen

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