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  1. toyohabu

    Building more crash-worthy composite planes and cockpits

    The US Army based on data from the Vietnam War has made great strides in survivability, the greatest killer identified was post crash fire. Here is a paper published in the early 80's that is a good summary of their findings.
  2. toyohabu

    First attempt at design for electric delta pusher

    like the idea, some similarity with one of my favorites the Rohr 2-175
  3. toyohabu

    3D Printed Wing Ribs - Are We Almost There?

    Found this on a blog dedicated to 3d printing. I am intrigued by the possibility of creating intricate 3D patterns similar to structure found in bone. like this
  4. toyohabu

    Revisiting Energy Allocation for Proper Usage

    there are these toroid fuel tanks, designing a wing around them might be possible. Tanks - single-hole
  5. toyohabu

    Fail safe cheap engine - possible?

    This idea has already flown, as an electric. I also liked this four engine Lazair
  6. toyohabu

    Short take off and landing

    JATO?
  7. toyohabu

    3D printing

    Just saw this article, this is a hinge made with Laser sintering. Also In the US their are no laws prohibiting owning a laser of any power. Laws do limit the power of devices marketed as Laser pointers to less than 5mw. The FDA is the agency that regulates Lasers CFR - Code of Federal...
  8. toyohabu

    Motus kmv4

    Has anyone looked into this motor for conversion. They intend to sell crate motors and a lot of the parts are sourced from GM. Motus KMV4 - GDI calibration dyno run - YouTube It seem that the engine and transmission weighs in at 200 lb from the Motus website Engine type 1645cc (100ci)...
  9. toyohabu

    Open Source Kit Aircraft

    What would the advantage be? Most plans cost under 1000 some considerably less. Who would volunteer to build the prototype in order to validate the design? What would the purpose be to a open source?
  10. toyohabu

    Form over Function

    I think the US Army would like to respectfully disagree on this point. http://ftp.rta.nato.int/public//PubFullText/RTO/EN/RTO-EN-HFM-113///EN-HFM-113-07.pdf The difference between a UH-1 to a UH-60 in crash worthiness is staggering this is just the seat, very minor changes in seat design can...
  11. toyohabu

    angle of fixed pitched rotors?

    A lot goes into this, rotor speed, rotor diameter, max forward velocity, power available, . You will need to plot several polar curves and then throw some chicken bones ;) I would look at your anticipated flight regime i,e hover, max speed, approach, and find what your required lift is and...
  12. toyohabu

    Rivets+plates vs. bolts in shear

    this site goes into it Rivet Shear Strength d = diameter of bolt/rivet t = thickness plate c = distance to edge Single Shear.. Shear Stress = 4F / pi*d^2 Compressive Stress = F / (dt) Plate Shear Stress = F / (2ct) Double Shear .. Shear Stress = 2F / pi*d^2 Compressive Stress...
  13. toyohabu

    Flight Simulator recommendations

    This simulator uses a flight model that might be of interest FlightGear Flight Simulator JSBSim Open Source Flight Dynamics Model
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