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    Raptor Composite Aircraft

    Get a helicopter in for the first flight. It seems to be all the fashion these days...
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    Raptor Composite Aircraft

    My pet rock can fly higher than that! It doesn't make it an aeroplane.
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    Raptor Composite Aircraft

    likewise with drag...
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    Scrappy’s Landing Gear Wings - Yay or Nay?

    So, if you watch the latest episode closely you can see that Mike has written Pops name on the side of the aircraft
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    Raptor Composite Aircraft

    What do they say about a fool and his money?
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    Raptor Composite Aircraft

    In western law it is also valued at a monetary value based on the price and quantity of shares that are sold to investors.
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    Raptor Composite Aircraft

    Sure, but the appalling stiffness of the ailerons probably was a bit distracting.
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    The "Beast One": What doesn't kill you makes you stronger

    The original Prandtl paper (in German) is here: http://www.ornithopter.de/daten/prandtl.pdf
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    @berridos, I use Solidworks for doing geometry. You could use anything that can generate an STL...

    @berridos, I use Solidworks for doing geometry. You could use anything that can generate an STL file but it's nice to use a parametric modeler because you can iterate geometry relatively quickly. It's a steep learning curve to tackle though! OF with inviscid flow sim will tell you lots - you...
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    The "Beast One": What doesn't kill you makes you stronger

    No, but I think it's going to be a strong function of the span-wise pressure gradient near the stall AoA. If this generates reverse span-wise flow then effectively you're losing the vorticity at that point that's generating your lift. If you control the pressure distribution near stall with...
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    @berridos XFLR5 is a great tool for modeling experimentation. It's not strictly for manned...

    @berridos XFLR5 is a great tool for modeling experimentation. It's not strictly for manned aircraft but as a learning tool it's great! OF will be something you can use for validation work based on your OML geometry before committing to real-world testing. I doubt you'll get a proper elliptical...
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    Francis Donaldson's thoughts on Evans Volksplane VP-2

    There is zero torsion/moment at the wing tip. Maximal at the root.
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    Francis Donaldson's thoughts on Evans Volksplane VP-2

    Just bracing it back to the same point on the fuselage would be an improvement.
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    The "Beast One": What doesn't kill you makes you stronger

    Also wing sweep affects where stall occurs first.
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    RoofTop Scale testing

    Test in a swimming pool with a model machined from depleted uranium...
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    New Engine design ?

    Looks like they've taken every difficult-to-master engine idea ever and added a few unique twists of their own. I'm guessing that any thermodynamic advantage it has is due to the opposed piston arrangement (surface/volume ratio benefits, mostly) and downsizing. The problem with any high-power...
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    After market liquid cylinders for Lycoming engines

    With decent mixturedistribution and a good ignition system you could achieve 0.37 on an air-cooled O-200 or an O-520/550 or just about any other engine. It's the inaccuracy of fuelling and ignition that impairs the fuel consumption potential of most aero engines. It's the price you pay for...
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    After market liquid cylinders for Lycoming engines

    Interesting that AC Aero's ealier AX40 and AX50 air-cooled cylinders are no longer available and there's a SB that pretty much takes them out of service...
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    After market liquid cylinders for Lycoming engines

    I think you mean clearances, not tolerances... Cylinders bores don't really reject so much heat compared to the cylinder heads. The temperature that they operate is huge compared to the temperature differential radially around the cooling flow path. Most of the thermal gradient is axially...
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    After market liquid cylinders for Lycoming engines

    ...but knock occurs in the coolest part of the combustion chamber! Having a cool head is less important than having an even temperature across the combustion chamber face. There's nothing about liquid cooling that makes an engine intrinsically more efficient than an air cooled engine. What...
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