Earl Boebert

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About Earl Boebert

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  • Birthday 09/19/1939

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  1. Earl Boebert


    "I can fly the box it came in" --- Sir Ben Ainslie (Old aviation boast, often repeated by Short 330 pilots) (Sorry, couldn't resist)
  2. Earl Boebert

    Luna Rossa Challenge. AC 36

    The quote is actually from Nathanael's son, L. Francis Herreshoff. Cheers, Earl
  3. Earl Boebert

    Team NZ

    Or radio sailors. Cheers, Earl
  4. Earl Boebert

    Team NZ

    Well, first, I don't think either of us are privy to their test plan so anything either of us says is almost certainly pure speculation. Second, the difference between data and cues is that data is something that you measure to compare with your model and cues are inputs to the crew that are outside the model. Airspeed and angle of attack are data; the sounds the rigging makes under strain are (most probably) cues. Cheers, Earl
  5. Earl Boebert

    Team NZ

    Not data, cues. Not quite the same thing. All simulators present an inherently incomplete model of the real world. Cheers, Earl
  6. Earl Boebert

    Team NZ

    Precisely. The problem with relying on simulator training is that the simulator cannot provide all the tactile and audible feedbacks from your as-yet-unbuilt open cockpit flying machine. It is quite possible that somebody heard or felt something unanticipated, thought "what's that?" and aborted the test to find out. I would expect more such incidents from a project team that would rather not break their only toy. Cheers, Earl
  7. Earl Boebert

    More than 30 killed off santa cruz island

    Even if you discount the hazard of a thermal runaway during charging, adding up amount of lithium in all the the phone, laptop, camera and dive light batteries on that boat suggests a significant hazard of accelerated burning. Once a lithium battery ignites the temperature rises substantially and you need a Class D fire extinguisher to put it out. Courtesy of a couple of idiots and YouTube, here's what happen when lithium ion batteries are thrown in bonfires: https://www.youtube.com/watch?v=4y7HuyiNrhk https://www.youtube.com/watch?v=eG8wOKnJAOY Earl
  8. Earl Boebert

    Where are they now? - Retired America's Cup Boat

    There are precedents (Nelson Piquet with his 1987 Championship Williams, decorating his home in Brasilia) Cheers, Earl
  9. Earl Boebert

    Foil Arms

    Thank you. Cheers, Earl
  10. Earl Boebert

    Foil Arms

    Sorry, episode of what? Ehman's vlog from 23 July? Or the 16 July article? Cheers, Earl
  11. Earl Boebert

    Foil Arms

    That was a 16 July story. Cheers, Earl
  12. Earl Boebert

    Foil Arms

    Absolutely right. Mistakes are an integral part of any human enterprise. The purpose of engineering management is to detect and correct mistakes before they turn catastrophic. That's what all the bureaucratic folderal of specs, reviews, simulations, analyses and so forth are about. And that is where the first arms development team failed, big time. In today's technological environment there are few if any excuses for taking a critical component all the way through fabrication and then, and only then, discovering it is not fit for purpose. The consequence of the management failure is that they spent most, if not all, of their contingency schedule (slack) for nothing. Now, or soon, any schedule slip of the canting subsystem has the potential to ripple right through and push back the end point of the project. It's not a comfortable situation to be in. The worst case scenario is that somebody says "we're going to go, ready or not." If the answer is "not," things can get ugly. Cheers, Earl
  13. Earl Boebert

    Foil Arms

    I wasn't asserting that I knew the reason, I was stating an opinion that of the reasons I could think of, benign explanations were in the minority. My opinion was tempered by the previous major, and IMHO inexcusable, failure of the engineering management of this component. It is possible that they have turned things around completely, but in my experience it would be somewhat unlikely. I would be very happy to be proven wrong. Cheers, Earl
  14. Earl Boebert

    Foil Arms

    Yes, among others. Also results of nondestructive testing, further analysis of behavior under torsion, lateral flex and vibration, and life cycle estimates/testing. Cheers, Earl
  15. Earl Boebert

    Foil Arms

    Passing a static stress test is a necessary but not sufficient step in the verification of a design. There are many possible reasons for such a further delay, few of them reassuring. Earl