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  1. U

    Vertically-staggered tandem seating?

    Canard airplane with higher back seat (but for a kid, may be not) Push a button wing folding airplane, with a slight vertical stagger.
  2. U

    Vertically-staggered tandem seating?

    Few other planes with higher placed rear seat.
  3. U

    Low aspect ratio sport plane ideas

    Well, if you do use the "Cri-Cri" canopy, it could look very slick (all transparent) and the yaw stability may be OK, with your winglet/rudder at about the same distance back as the "Cri-Cri" (and you have 2)
  4. U

    New rotorcraft concepts

    Thank you for confirming this fact, explained earlier as good as possible.
  5. U

    New rotorcraft concepts

    To understand it, you have to think that behind the prop the airflow is perpendicular to the prop"disc". If the incoming air comes sideways, in front of the prop, the air flow changes it's direction passing through the prop, creating a yaw force. For example: the incoming air comes from the...
  6. U

    Low aspect ratio sport plane ideas

    The original Arup was built with "sticks" and hold together because of the thick center section. It looks super light, but the stitching to fix the fabric to the ribs needed extra long needle, I suppose. With the EPS foam + fiberglass strips being wide, no stitching is needed probably. -->fast...
  7. U

    Design challenge: world's smallest airplane.

    I like your "Vari-Tiny" Tiger Tim, it looks like a doable concept, with some minor optimizations. One concern, would be the strong vortex of the canard hitting the winglet/rudder and that this unsteady airflow is exiting some vibration or rudder control issues. (The F-18 fighter has that too and...
  8. U

    Low aspect ratio sport plane ideas

    On that nice simulation of the airflow, can you make it fly a little "crabwise" to see a strong (or not) changes in lifts between the right and left wing ? Because that would be the roll "wable" I was writing about earlier.
  9. U

    Low aspect ratio sport plane ideas

    Lippisch had an evolution of the wing end plate position on his Storch tailless gliders, from vertical up to partially sticking down (like Rutan's Long Ez) to the wing end plates going down (anhedral) on his later Delta development. If you try your design in X-plane, you will see how "wabely" it...
  10. U

    Design challenge: world's smallest airplane.

    I like that little flying shoe box, it's cute and easy to build. I would be concerned about the yaw stability with that long nose and the yaw instability of a tractor propeller. I would put the pilot in front and a pusher prop, having a yaw stabilization effect. The aircraft front could then be...
  11. U

    Inverted inline two cylinder direct drive fourstroke 40hp/3000rpm ideal engine.

    Well, BMW did all that in the parallel twin motorcycle engine. With even firing space, no rocking vibration, mass balanced like a boxer twin (but with no rocking) -->very smooth.
  12. U

    Low aspect ratio sport plane ideas

    Well, thanks for the picture of your bike, it's nice to see people going after their dream and building it. This forum was very interesting for me, and good luck for the future.
  13. U

    Oil for 503

  14. U

    Low aspect ratio sport plane ideas

    "nestofdragons, post: 650663, member: 44952"] The central control surface becomes the elevator (was previously the trim). The outer control surfaces are no longer elevons, but ailerons. If air separation happens, it will be in the center due to the much thicker airfoil at the center. In center...
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