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  • Dusan
    Dusan replied to the thread The Custer Arc ?.
    They did test the lift at 'hover', see the table at page 10. For a project using channel wings for VTOL see here: https://hopflyt.com/
  • Dusan
    Dusan replied to the thread The Custer Arc ?.
    The benefit of the Custer wing comes from the wing top surface exposed to propeller accelerated airflow. This leads to several...
  • Dusan
    I'm no structural engineer, but wouldn't carbon stiffness have all the loading transferred to carbon and the wood act only as 'foam'?
  • Dusan
    Hydrogen is not really an energy source. Ideally, extracted from water, theoretically the same amount of energy can be recovered by...
  • Dusan
    Gasoline energy density is a bit under 13,000 Wh/Kg (wikipedia); the best lithium batteries have about 250Wh/Kg; that makes gasoline...
  • Dusan
    Dusan replied to the thread New rotorcraft concepts.
    Any edgewise rotor aircraft is having on it's best day a L/D equal to 5, but usually being about 2 to 4.5. This is regardless of the...
  • Dusan
    Dusan replied to the thread EAA No Longer Has Free SolidWorks.
    Has anybody experience in openVSP? It's a NASA development for initial aircraft analysis. From the website: "OpenVSP is a parametric...
  • Dusan
    Dusan replied to the thread Solder Splice Connectors.
    To anyone that is considering extending the thermocouple wires - you need to understand that the thermocouple is measuring temperature...
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  • Dusan
    Dusan replied to the thread New rotorcraft concepts.
    Actually the GEN_H-4 needs abut 40hp to hover, and it's MTOW is half of the VZ-1
  • Dusan
    Dusan replied to the thread New rotorcraft concepts.
    Sure, but a hovercraft is not an aircraft. The VZ-1 needed about 50kW to hover, due to relatively large disk area and 40% of the lift...
  • Dusan
    Dusan replied to the thread New rotorcraft concepts.
    I was always a fan of the Hiller flying platform, I liked the concept, an efficient personal hovering aircraft. Too bad they did not...
  • Dusan
    Dusan replied to the thread AMPERe One stroke engine.
    @PMD For the same weight, the energy contained in fuel is 40 times more than in a lithium battery, as a fact. About the one stroke...
  • Dusan
    Everything about producing thrust is efficiency. How much of the go-juice you spend to generate thrust. Propellers are better at slow...
  • Dusan
    Also home built Orion drive aircraft face regulatory hurdles. But politics isn't the biggest concern. It's the noise complaints!
  • Dusan
    I don't want to get into arguments, but facts are facts. Our current gasoline car engines have one of the lowest thermodynamic...
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