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  1. Orange4sky

    Off the shelf DIY dual plug CDI ignition with crank trigger

    Hi, I'm building a VW motor and want to install dual plug ignition. It seems like the simplest way is with dual output coils driven by a black box. The question is which black box. I have a Lightspeed engineering system on my O-540 with magnet crank triggers. You can either have one CDI and a...
  2. Orange4sky

    Could a well seasoned homebuilder build himself a vehicle that run on the streets ?

    That Swiss car has a vacuum …and four wheel drive. Maybe your acceleration could be enhanced with an invention of mine. You take a spinning shaft off the engine pointed in the direction of travel and attach a big, flat stick to it, angled so it throws air behind you. I call it the rotary air...
  3. Orange4sky

    Could you design anything stranger?

    Airtruk designer. Kazimierz Gocyła One of the two Polish born Belphegor engineers. Seems like the un-diverse are pretty good at producing butt-ugly stuff.
  4. Orange4sky

    Want Battery Recommendation for Rotax 503

    Which model?
  5. Orange4sky

    To what out-of-production aircraft would you buy the rights, if you wanted to start a 'kit-plane' company?

    Beautiful aircraft. Went bankrupt in 1982. That timing tho.
  6. Orange4sky

    How does lift *actually* work?

    That doesn't make sense to me. It explains ground effect, but not all vectors of lift. One way Mclean puts it: "The pressure field is sustained by the fluid's inertia and acceleration." If it's the ground, then how would you create lift when banking past 90? My understanding is that a wing...
  7. Orange4sky

    Oceangate Sub Construction Details and Implosion

    This is an uncommonly good analysis (for youtube) by an engineer with good credentials and relevant experience of many of the other safety issues besides the CF tube itself. Analysis of an Insultingly Predictable Failure
  8. Orange4sky

    Oceangate Sub Construction Details and Implosion

    Further to “critical thinking”, you can not reliably make grand sweeping assumptions about the intelligence, morals or any other attributes of a group of people based on their occupation and assume it has anything to do with their choice “Stupid people are attracted to journalism.” If career...
  9. Orange4sky

    Oceangate Sub Construction Details and Implosion

    That was on a Russian sub, not the Titan.
  10. Orange4sky

    Oceangate Sub Construction Details and Implosion

    This just gets spicier by the minute: https://www.insider.com/oceangate-ceo-said-titan-made-old-material-bought-boeing-report-2023-6 Does anyone know if that CF shown being wrapped on the form was prepreg?
  11. Orange4sky

    Oceangate Sub Construction Details and Implosion

    It looks like the tube was machined to fit the end caps tightly with some kind of tolerance. Besides the resulting stress riser of a sharp corner, that seems like a area of concern. I imagine that the titanum and composite have different deflections under pressure and different moduli of...
  12. Orange4sky

    Oceangate Sub Construction Details and Implosion

    I just saw a video claiming that the pressure at 3800m is about 5,532 psi. Carbon fibre and acrylic are brittle. If those failed suddenly as brittle structures usually do, don’t you think that the potential for implosion is there? Coupled with the sound analysis captured by the navy, implosion...
  13. Orange4sky

    Oceangate Sub Construction Details and Implosion

    I saw a video that explains that there was at least one internal secondary skin of a metal mesh that was backlit for aesthetic reasons. The mount was screwed into that mesh.
  14. Orange4sky

    Oceangate Sub Construction Details and Implosion

    The moment with peak cringe for me has to be the mixing of the epoxy, or whatever adhesive, to bond the TI end rings on the tube in that assembly video (@ 4:00). A paint stick in a can to mix something that is this critical seems bonkers careless to me. One has to wonder what else they...
  15. Orange4sky

    Auto Engines Aren't Designed to Take Full Power for More Than a Few Minutes...

    Hence the warning about not opening a hot radiator. “A rag will save me” Um, no. A pressure vessel is just a bomb in suspended animation. Don’t hit the play button.
  16. Orange4sky

    Auto Engines Aren't Designed to Take Full Power for More Than a Few Minutes...

    A lot of that tech was used in the first Honda Insight that I’m sitting in right now. Another was offset crank so the power stroke is when the rod is more vertical to reduce side load on the cylinder walls and thus friction.
  17. Orange4sky

    Air Canada "Orders" 30 Electric Aircraft

    I think everyone here knows that batteries are the current limiting factor. There’s trillions spent on development for national defence. No one seems to mind that kind of collective effort. Any advance in battery tech adequate to make batteries viable for aviation is going to require similar...
  18. Orange4sky

    US Military Shoots Down Fourth Flying Object Near Michigan

    The hysteria you can produce in humans using trivial events sprinkled with some exaggerated threats and a pinch of production value is freaking amazing. And the reverse in which things that actually affect people’s lives are completely minimized and they don’t notice the difference. Baffling.
  19. Orange4sky

    Stainless seamless tubing as a good replacement for 4130 tubing in airframe design

    I love the idea of stainless airframes. My hunch, though, is that cracking at joints caused by poor welding conditions almost guaranteed by amateur welding skills and cracking from fatigue hardening would require similar, if not more difficult inspection and repair. External corrosion is easier...
  20. Orange4sky

    Wing in ground effect boat

    Someone built and flew one of these ground effects boats and got it in Popsci or Popmech in the 90’s, I think. It had fabric anhedral “wings” and a pusher prop.
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