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  1. V

    Pushers...way to go ?

    Nobody questions the ability to design a system to keep a 200 lb pilot in place during survivable decelerations, but somehow it's a stretch to imagine that we could do the same for a 200 lb engine. Go figure...
  2. V

    Pushers...way to go ?

    That would be quite an array of vanes, with accompanying drag. The downflow generally extends for many feet above the wing, so quite a bit of the prop arc would be covered, at least on one side. I suspect the drag and weight would swamp any hoped-for improvements in prop efficiency. Better...
  3. V

    Pushers...way to go ?

    I don't see anyone saying that. Most are saying (correctly) that FOD to props is more likely with a pusher configuration. Of course. A sensor in the nose or a need for ordnance to transit near the front of the fuselage can be a couple of the good reasons to choose a pusher.
  4. V

    Pushers...way to go ?

    If we want to see greed and bad actors, look at the "hand dictating from above' system. All systems need rules. But a system that best harnesses human self interest for the benefit of others has a giant advantage.
  5. V

    Pushers...way to go ?

    Thanks. It's a classic, IMO.
  6. V

    Pushers...way to go ?

    True. In fact, no person even knows how to make a pencil. "I, Pencil" by Leonard E. Reed.
  7. V

    Pushers...way to go ?

    The money problem is a symptom, not a root cause. The money would be there if the technology/approach makes sense economically. Yes, there is a potential "chicken and egg" issue with such endeavors, that's what fleet programs are good for.
  8. V

    Pushers...way to go ?

    I think the point is: Having the technical capability to build the infrastructure is a long way from having the infrastructure.
  9. V

    Pushers...way to go ?

    The rumor is that reporters flew on the plane months ago, but they remain stuck inside the airplane while ground crews untape the seams and door gaps of the laminar fuselage.
  10. V

    Honda K20C1 FK8 Auto-Engine Conversion

    I'm sure there's some mistake. ;) I've read that the Zenith Facebook site is "independent". Viking and Zenith are economically interdependent entities.
  11. V

    Honda K20C1 FK8 Auto-Engine Conversion

    Or, "resolved" (from one perspective) by a company name change and hanging out a new sign. Jan has done it before. 'Clean slate, let bygones be bygones. Don't be a hater. This is experimental aviation. Anyway, here's a new idea you guys will like."
  12. V

    Pushers...way to go ?

    And build in a rolling tendency at all airspeeds? That downflow at the TE is unavoidably associated with the lift produced over that section of the wing. To equalize the blade AoAs on both sides of the prop, the vector would need to actually be upward on one side. That's a LOT of reflex.
  13. V

    Pushers...way to go ?

    Thanks. Was this your first composite project? The old Rutan video and thin, big yellow booklet do a good job of explaining about the processes and promoting the design. They are so effective that (newbies) might believe an EZ can surely be built in a few hundred hours. I suspect it's the...
  14. V

    Best CAD tool for modeling and simulation on for a homebuilt.

    Structural modeling or aerodynamic modeling?
  15. V

    B21 Reveal

    My concern is how long/enduring/predictable the low observability edge of the B-21 will prove to be. In the 50 years after WWII we were in a constant battle of ECM vs ECCM. The battle today is between LO and improved signal processing. In that case, ISTM that improvements in signal...
  16. V

    Pushers...way to go ?

    Here's a recent thread on something similar. Pod & Boom ; the folding prop integrated Around the boom It comes up from time to time, and there have been flying examples of planes designed this way. The main issues: 1) Prop and PSRU maintenance 2) Possible excitation of boom vibratory mode...
  17. V

    Pushers...way to go ?

    Yes, there's no great way to do a pod-and-boom pusher. The Snark's design does better than most low-boom planes in aligning the thrust line with the center of drag during cruise flight. And the high boom also isn't in the prop wash creating additional drag (it's hard to do that with low...
  18. V

    Pushers...way to go ?

    Thanks. It is interesting that Barber, to cope with driveshaft vibration issues, also went with a homebrew coupling similar to the Flexidyne (Dodge) used on the Mini-Imp.
  19. V

    B21 Reveal

    Oh, don't fret, your original estimate will be right sooner than we'd like. In these programs, costs and delivery dates slide (but only in one direction).
  20. V

    B21 Reveal

    The B-21 is for the "must work, no fail" task. Not just "must work", but the folks on the other side of the table must also believe it will work.
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