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  1. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Thank you! Here they are!
  2. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    I use it because it's a high-lift airfoil for a low Reynolds numbers. It's the way I could you a smaller wing. This airfoil is also used on a fabric covered wings.
  3. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    The first wing rib is ready! Yeah!! 182 g or 0,4 lbs
  4. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Engine cowl, instrument panel (that will also form a windshield shape in the bottom) and seats are to be made out of fiberglass or carbonfiber.
  5. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    I mount my Rotax 503 in the front, so my plan is to make a non standard cooling, like this
  6. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    As for the exhaust - now I'm using modified Rotax SM muffler.
  7. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    I redesigned the FWF part, actually.. I made f firewall Around the engine, I don't want pilots legs and arms to be damaged in a case of fire. I gonna use 0.02 aluminum + Zircoflex flexible ceramic heatshield. It will be lighter then using a 0.02 steel firewall.
  8. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    The first cockpit design was based on statistics and CAD analysis, but I'm sure it is necessary to check it with real pilots, that what I did and that found the most suitable seat shape. Anyway it was then modified.
  9. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    There was some technical pause, but we are back again. Finishing the fuselage frame
  10. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    For me 40 HP is not enough for two people, its a compromise.. The main problem for me now is balance between weight and safety, I gonna finish the prototype and then make a deep analysis. What kind of aircraft I can design in this class. Two seat with 36-40 HP is the only way I see now, but...
  11. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Very interesting comment, thank you! I planned to use a current-production engine in future, plus you can't use a passenger option for a part 103 aircraft. Using this design for a heavier pilots is a good idea. Polini Thor is not powerful enough for such type of an aircraft because of high...
  12. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    The results were practically the same, but anyway I'm looking forward for a fly test. It's not easy to calculate drag of such type of an aircraft, I'm using statistical data. And also the wing should not produce so much lift (comparing with calculations) cause I use fabric covering.
  13. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Is's not easy to do it under the weight limits, rear spar gets reasonable loads because of the airfoil features and it is not so easy to increase the span. But I agree with you that it would be better to have greater aspect ratio. I'm thinking about lower Vne on the later versions so it will...
  14. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    I use modified Wortmann FX 63-137. In CFD calculations (half of the wing as on the picture) I had 2-3 million points and about 1 million in the boundary layer. Also some calculations were made with 10-12 million points.
  15. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Thank you for your interesting comment! Wing incidence is -2°and even though the aircraft is expected to fly slightly nose down (pitch -1°) at cruise. I use modified FX 63-137 airfoil. Maybe it does not look like it has a high chamber, but it has. Nevertheless I'll get tail low at low speed, but...
  16. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Some, like avionics, have been ordered.
  17. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Some parts are already waiting to be installed
  18. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    The design is based on CFD calculations and stress analysis.
  19. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    And prepared laser-cut parts to start the wing.
  20. 4-e-v-e-r

    MotoBird - 2 seat aircraft with Rotax 503

    Now we've started the fuselage frame.
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