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  1. #1
    Techpod designer Hobby UAV's Avatar
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    The techwing

    Hey everyone,
    I wanted to share the work I am doing on a new flying wing design.

    I began with XFLR5 to help select the proper airfoils and determine correct reflex etc.

    After I was happy with the results I made a prototype.

    after many test flight and input from another test pilot. I set about to improve the low speed handling, reduce tip stalls and also improve the load handling capabilities. I increased the over all size to a 42inch WS, up from 36 inches. I increased to tip cord and added real working wing tips and a fixed LE slot to the outboard wing area.
    before:

    After:

    The new tips greatly reduce the wingtip vortex. This mean better efficiency, better stall characteristics and grater load carrying capability.
    In order further reduce tip stall and greatly increase the CL max of the overall form. I added fixed slots to the LE of the outboard wing panel.

    This helps the airfoil achieve a Cl max of ~1.2, much higher then the ~0.75 Cl max of the unmodified airfoil.
    You can see the large amount of negative pressure generated by the slot at high angles of attack. This is at about a 13 deg AoA.

    the blue area represents the lowest pressures.

    I was inspired by the Me 163 Komet

  2. #2
    GO HAWKS Hucker's Avatar
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    Really cool work!
    KF7SKL,TechPod/Walrus/250mmQuad/HoneyBadger, EZUHF,SL-AAT, 1G3/2G4/5G8

  3. #3
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    Looks like it'll be a lot of fun!

  4. #4
    Rock Bottom FPV Addict realtvnow FPV's Avatar
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    Don't forget, after you fine tune the shit out of it make it sexy!
    Sex sells! And I likes me a sexy plane
    "We can't stop here, this is BAT country !"

  5. #5
    Techpod designer Hobby UAV's Avatar
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    Thanks guys. Working on the sexy.

    I just finished the first mold. Loving the new machine. had to work out some kinks but it only took 20 minutes to cut this
    Last edited by Hobby UAV; 18th July 2014 at 12:04 AM.

  6. #6
    Sky Pirate & FPV Outlaw SecretSpy711's Avatar
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    Quote Originally Posted by Hobby UAV View Post
    Thanks guys. Working on the sexy.

    I just finished the first mold. Loving the new machine. had to work out some kinks but it only took 20 minutes to cut this
    what material is that mold? Corian?
    youtube.com/secretspy711
    COFPV.com

  7. #7
    Techpod designer Hobby UAV's Avatar
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    I have one of the winglets done on the makerbot

  8. #8
    Techpod designer Hobby UAV's Avatar
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    I had a dead stick about 1 minute into the flight due to a bad ESC. landing was no sweat. It handled very nicely I could tell from the small amount of time I was able to fly. Thanks for the video and help launching, Trevor.

  9. #9
    Pilot gobigdale's Avatar
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    looks good!

  10. #10
    Techpod designer Hobby UAV's Avatar
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    Thanks! went flying yesterday. Had a blast. The LE slots really pay off. The stalls are always straight ahead. No tip stall. Kill the power and pull full back elevator and it just drops the nose. You can see a few times in this video of it just loosing altitude and porpoising. The ailerons remain effective, you can even steer it around while it is doing it.

    this was a 1100 kv speed 350 size motor on 4 cell with a 8x6 prop

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