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  1. A

    Small aircraft in the Smoky mountains

    What about magnetic redrive? How much more efficiency do we get if a 1/2 VW's top RPM is reduced to 2500?
  2. A

    3D printed Carbon Fiber Wing Ribs???

    If you use polycarbonate, you can even get it lighter than foam or the same weight as foam but much stronger.
  3. A

    Small aircraft in the Smoky mountains

    A gyroplane for the smoky is nice and all, but to fly Degrow's gyro, I think you are going to need a helicopter pilot's license. Please correct if I am wrong; love to fly a gyro with jump take-off capability.
  4. A

    What are you doing in addition to flying?

    Marksmanship and making my own ammo. Learning to make restaurant-quality food. Computer software system design and building.
  5. A

    3D printed Carbon Fiber Wing Ribs???

    Keep in mind that PLA is at least 25+ times the density of the foam. You might have to add a lot of hollow spaces in the part to bring its weight download to an acceptable level. We can get some hints from the structure of human bones. Very large hollow space toward the center and smaller...
  6. A

    Flutter speed prediction using same methods used in AI

    Found this paper. It is an interesting method for flutter speed prediction. I think it would be more accurate if GVT data is included as input. https://journals.sagepub.com/doi/full/10.1177/16878140211062275
  7. A

    This is a full scale spitfire replica

    Wooden structure and metal skin. I wonder what the thickness of the skin is. A spitfire replica
  8. A

    3D printed Carbon Fiber Wing Ribs???

    I don't know if it is possible to mix lightweight glass microballoons in abs, pba, and other plastic filaments for 3D printing. The printed part should have a density comparable to balsa.
  9. A

    3D printed Carbon Fiber Wing Ribs???

    deleted
  10. A

    99 year old aeroplane with 3 horsepower takes flight!

    The fact that it has a145 sq ft cantilever wing is impressive. It also tells that how little power it takes to maintain a level flight if you have a streamline body.
  11. A

    99 year old aeroplane with 3 horsepower takes flight!

    I can replace that engine with a Hirth 23 50hp 2 stroke, and it will weight a few lb more. Still meets part 103 requirement, but with much better performance. :) This is plane's spec General characteristics Crew: 1 Length: 24 ft 3 in (7.39 m) Wingspan: 37 ft 0 in (11.28 m) Height: 4 ft 9 in...
  12. A

    99 year old aeroplane with 3 horsepower takes flight!

    I would like to find out what the max take off weight is. If that thing can fly like that, a 20hp engine put on a ultralight can definitely fly much better. P.S. I think I heard someone in the crowd said it used 2000ft of runway.
  13. A

    99 year old aeroplane with 3 horsepower takes flight!

  14. A

    Hello everyone，I am from China。

    Enjoy while it lasts.
  15. A

    Hello everyone，I am from China。

    Yeah. You are mostly right. However, flyers in China just fly without filing a plan because filing a plan costs more than the fine itself. Everything is commericalized in China. If you own a plane, you will get calls everyday from the CAAC (China Airline Always Cancel) asking you to fly since...
  16. A

    Use of carbon fiber pultrusions in extreme lightweight wing construction

    Does this mean a whole D-tube gets pulled out of a die or it is built with pultrusion carbons?
  17. A

    "SkyWing" hybrid wing body ultralight

    Excellent. Hope to see you pilot the full scale in its maiden flight soon. Just make sure to post the video.
  18. A

    Hello everyone，I am from China。

    Yellowhammer, using proxy services to break a hole on the great firewall to communicate with foreigners is criminal offense in China. Repeat offenders are punishable by imprisonment. caoyun has to be very careful when he posts here.
  19. A

    Polycarbon in composites

    How come we haven't seen polycarbon used in composites as a matrix? It is stronger than epoxy.
  20. A

    Treated wood could be as strong as CF?

    When lumber becomes too strong, is it going to be as brittle as CF?
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