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  1. BrianPetersen

    Tesla Cybertruck fire and alleged design flaw. . .

    Any sort of time delay beyond milliseconds requires an assumption that the vehicle's electrical and control systems remain sufficiently integral through the crash to allow the timer to count down and the action to be taken. What actually happens is that once the various crash sensors and the...
  2. BrianPetersen

    Tesla Cybertruck fire and alleged design flaw. . .

    One would hope that battery / electrical system failure / compromise as a result of a collision impact is considered. Normally the point at which the airbags and seat-belt pretensioners fire, is before there is significant compromise of the bodyshell, and one would think that the signal to fire...
  3. BrianPetersen

    Tesla Cybertruck fire and alleged design flaw. . .

    Most of the rules were written before there was such a thing as electronic controls. All risk assessment procedures, FMEA included, are subject to some degree of subjective evaluation. To what extent do you address combination failures? How do you estimate the probability of an event occurring...
  4. BrianPetersen

    Tesla Cybertruck fire and alleged design flaw. . .

    You're assuming that a certain manufacturer actually does FMEAs, as opposed to "yes, boss, we'll make that work".
  5. BrianPetersen

    Tesla Cybertruck fire and alleged design flaw. . .

    Tesla doors have an inside mechanical release, but it's in a different location from the way users normally open the doors, so they wouldn't necessarily know about it. (Bad.) The cybertruck has an additional problem in that there is no outside mechanical door handle at all. (Very bad.) Tesla...
  6. BrianPetersen

    Race clutch intermediate steel plates

    "Race car" covers a lot of ground. For that matter, "clutch" covers a lot of ground. Cast iron, and high-carbon steel, are the usual choices. They may be chrome-plated. Don't see any reason for using special alloys. The steel plates in motorcycle and automatic-transmission multi-plate clutches...
  7. BrianPetersen

    Regarding Beam sizing for Heavy duty trailer

    If you are specifying and buying axles and springs, then the factors of safety for impact loading etc in terms of the axle itself are already built into the axle. If you are looking at the loading imposed on the chassis by the suspension, including bump-impact loads, that's on you. Trailer...
  8. BrianPetersen

    Gooseneck Design over 30,000lb GTW

    https://accessories.ford.ca/shop/en/ca/exterior/hitches-towing-and-recovery/hitch-kit-gooseneck-40-000-gtwr-pc3z-19f503-a https://maxxdtrailers.com/lhx-40k-heavy-duty-flatbed-gooseneck https://bluewatertrailers.ca/catalogue?id=605&inv_uuid=B35B47BE-45EF-11EB-B0E3-3982F52AB103 I don't see any...
  9. BrianPetersen

    NEED HELP WITH DETERMINING WAHT STAINLESS STEEL FASTENER TO USE

    Unless this is a forced-induction engine (seems unlikely with the existing design using what I call "wood screws") the clamping force is irrelevant. The screws just need to hold the upper manifold in place (against vibration and the like). Torque limitations are more to protect from gorilla...
  10. BrianPetersen

    BIW hem overlap minimum requriement

    Usually, this sort of joint is on door-skin outers to inners, or similar situations (the cosmetic outer is hemmed around the edge of the structural inner), so no spot-welding. Yes, you need to make sure the adhesive/sealant squeezes completely out both ends of the joint to avoid moisture...
  11. BrianPetersen

    Plastic grommets

    If you are asking for the purposes of design, I am quite sure the manufacturers of these components have engineering data available for each specific design, of which there are many. Ask them. They're normally used for securing trim panels, interior components, etc., for which the consequences...
  12. BrianPetersen

    wheel time hole sizes

    Having just done the winter-tire swap on my car (GM), it has M14 studs also, and I just ran downstairs to check. The aftermarket wheels and matched wheel nuts (not OEM) have a conical interface and the holes in the wheels are 14.8mm diameter, which is what one would expect for M14 fasteners to...
  13. BrianPetersen

    wheel time hole sizes

    It would sure help us in the rest of the world if we knew what sort of trailer this is, where the wheels came from, where the axle came from, where the nuts came from, whether the wheels are the correct ones to be used on that axle, whether the nuts are the correct ones to use with those wheels...
  14. BrianPetersen

    BEV adoption rates and factors that enhance or detract

    All modern cars have bespoke headlight and taillight assemblies. This isn't an EV issue, it's a "modern cars" issue.
  15. BrianPetersen

    Layoffs 2024-2025 ??

    Fiat 500e is roughly the same size as a BYD Seagull, and does decently in Euro NCAP. https://cdn.euroncap.com/media/66921/euroncap-2021-fiat-500e-datasheet.pdf Obviously it is not the same car, but it's about the same size and weight (the Fiat is a little smaller), and the Fiat 500e is sold in...
  16. BrianPetersen

    Layoffs 2024-2025 ??

    The BYD Seagull is not (yet) sold in Australia and hasn't been tested (or perhaps it has, but results are not yet published), but all of its companion models including the marginally-bigger Dolphin have been tested, and have good NCAP ratings (5 stars). Testing within China to their own...
  17. BrianPetersen

    Layoffs 2024-2025 ??

    "EVs have fewer parts so less to integrate and test." Well, I wouldn't say "fewer", just "different". The motor is simpler than an engine, the gear-reducer is simpler than a transmission, there's no exhaust system or fuel system, but the battery and electronic controls and thermal management...
  18. BrianPetersen

    Layoffs 2024-2025 ??

    My crystal ball is cloudy, but I see layoffs ahead in almost anything that involves manufacturing and retailing, and unskilled jobs in USA going unfilled in most any outdoor work ... and gruntguru has a fair point about hospitality, as well. I'm happy to be retired, but it doesn't mean I don't...
  19. BrianPetersen

    Tesla Cybercab reveal

    For a couple of years, no. Didn't need one for day-to-day living within Toronto. Only a third of Parisians own a car. https://reasonstobecheerful.world/cars-are-vanishing-from-paris/
  20. BrianPetersen

    Tesla Cybercab reveal

    Sure. Back when I lived and worked in Toronto, I used it all the time. Loads of people of all walks of life do. And Toronto's transit system is not great by international standards. Plenty of people in European cities don't own a car. Don't need one.

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