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    Re: Icon A5 Update - No Deliveries!?!

    It doesn't take much connecting of the dots to see that pretty soon robots will make and deliver everything that we need to live. The economy of supply and demand being what it is, that can only...
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    Re: Where to put your motors?

    I think that that is wrong in a general sense; my understanding is that the drag of a windmilling prop is relatively proportional to its RPM.
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    Re: Where to put your motors?

    If they're the cheap commercial-grade motors, I'd locate them so that the departing prop doesn't strike anything vital.
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    Re: GE/T406 Engine. What would you design / build?

    Me, I'd buy a bare L39 airframe and plug that sucker in somehow. It's longer than the Al-25, but the diameter is about right. Some racer would buy it just to get ahead of Rick Van Dam.
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    Re: The big video topic

    Can't remember if I posted this one before. It's nice when video captures one of your nicer landings.


    https://www.youtube.com/watch?v=ZbpldnXsEM0

    I've flown several times in gaggles like...
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    Re: GE/T406 Engine. What would you design / build?

    A couple of additional comments on this after thinking about it overnight:

    * At a guess, I'd say that the core value for what you describe, with good provenance, is probably a decently-sized...
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    Re: GE/T406 Engine. What would you design / build?

    According to Wikipedia, we're talking about an engine that is about 6.5 feet long, has a diameter of about a yard, and weighs about a half ton. It produces about 6000 horsepower, and is certain to...
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    Re: Sonex down at Whitman Field

    They say it's not the fall that gets you; it's the sudden stop at the end. A failed engine can be a yuge distraction that lures your attention away from flying the airplane.
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    Re: Sonex down at Whitman Field

    I have twice in my life pulled the mixture while going for carb heat. Both times I was saved by the dictate "when the engine quits immediately after a change, undo that change!"
  10. Thread: 4130 to Aluminum

    by BoKu
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    Re: 4130 to Aluminum

    Doesn't it depend a bit on the filler rod?
  11. Thread: 4130 to Aluminum

    by BoKu
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    Re: 4130 to Aluminum

    Try a forum search, I think we've covered this before. Bottom line: it depends a lot on what it's for and how it's loaded, and the answer usually involves cross-sectional moments of inertia and other...
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    [Wanted] Re: V Tail Bonanza ruddervator control mixer diagram

    Yeah, good point. In some cases packaging constraints make the V-tail the more effective option.

    As for the V-jet, I don't know why they used a V-tail. It appears to combine the suboptimal access...
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    [Wanted] Re: V Tail Bonanza ruddervator control mixer diagram

    Let's be clear here, unless you're adding horsepower, speed comes from drag reduction. Drag comes from parasitic things like intersections and protuberances, is also an inescapable cost of producing...
  14. Thread: How does it fly?

    by BoKu
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    Re: How does it fly?

    I'm hardly an unbiased source on that. But for the sake of argument:

    The HP-24 originally started out as a kind of "super HP-18." My thinking was to address the HP-18's limited downward...
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    [Wanted] Re: V Tail Bonanza ruddervator control mixer diagram

    I really liked the HP-18 until I had one of my own. It is indeed a very pretty glider.
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    [Wanted] Re: V Tail Bonanza ruddervator control mixer diagram

    I think we're going to need a bit of context before anybody can provide any meaningful information. Are you interested in the tradeoffs between V-tailed and more conventional configurations? Between...
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    Re: Removing thermostat from water cooled engine.

    Extraordinary claim, followed by dearth of extraordinary evidence. Hilarity ensues.
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    Re: Removing thermostat from water cooled engine.

    The first rule of Dunning-Kruger club is that you don't know you're in Dunning-Kruger club.
  19. Thread: spars

    by BoKu
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    Re: spars

    Two angles back to back.
  20. Thread: spars

    by BoKu
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    Re: spars

    To add a little more meat to this discussion, the strength and stiffness of a beam loaded in bending is related to the strength and stiffness of the material, and to the moment of inertia of the...
  21. Thread: spars

    by BoKu
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    Re: spars

    None of those look like particularly efficient uses of material. An I-beam or C channel made of angles riveted to a planar shear web would probably score higher on almost every metric.
  22. Re: Have you heard of this 1/2 VW made in Brazil?

    No much VW there. Looks more like CitroŽn kit.
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    Re: How do CNC'd parts fit in the FAA's 51% rule?

    Well, that ends in a question mark, so I'll opine that the answer depends on one simple factor: Why is the one at the machine?

    If the one is there because they are getting paid to operate the...
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    Re: How do CNC'd parts fit in the FAA's 51% rule?

    That is how the process was described to me back when I was helping build an RV-8. But when it actually came time to certify one of my HP-24 gliders as amateur-built experimental, that approach was...
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    Re: Akaflieg Arnold Winter 2017

    Just FYI, we are indeed convening another one of our Akaflieg gatherings at our Arnold, CA 95223 workshop 21 through 27 January 2017.

    For this session we will be concentrating on making a set of...
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