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My latest Multirotor, dubbed The spider, Built for BBC interview

Posted by Jared Reabow on October 7, 2013 at 12:17pm

This is my latest multirotor, it was made entirely on a Laser cutter every single part (but the electronics)

The camera Gimbel is also laser cut and the entire thing is my design.

Just thought i would like to get your guys thoughts on it.

~A few notes on the design

The arms are raised above the CG to give stability in stable hover and decent.

The motors have a 10% outwards tilt this gives a higher flight speed by allowing a larger tilt in flight, it also gives stability when descending or ascending as the motors give a minute amount of horizontal control.

the under mounting of the motors give a around a 9%efficiency increase as the air is not thrusted onto the arms.

the overall result is a inherently stable design, in one of my recorded flights the motors are completely cut for a few seconds and the copter glides down as the motors auto rotate, it didn't flip or roll or oscillate, it simple glided down.

here is move video footage

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Comments

  • S. Baxter October 7, 2013 at 6:16pm

    Hi Jared,

    You mentioned 9% more efficiency when the air is not thrust down onto the arms, but isn't the air obstructed when it encounters the arm when it is drawn into the prop from above?

    Thanks

  • Tissy October 7, 2013 at 4:05pm
    Good piece of work Jared, the over zealous radio presenter got me a bit worried though with his keenness to meet "Malcolm" as it came in to land. Just food for thought in the future, set your safety boundaries.
  • Edgar Scott October 7, 2013 at 3:32pm

    Amazing, you built it upsidedown by mistake and the APM is so good it still works. ;-)

  • Jared Reabow October 7, 2013 at 3:14pm

    weighed in at a bit over 4kg with gimble and batteries

    use 8 kinda crap motors 

    http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=...

    Donkey st4010-820KV 194grams

    4 x 300mah Turnigy batteries 239grams

    40amps ESC's 40grams

    so 1.554 KG on the motors + 320 gram esc's + 956 grams on batteries + 500grams all in for wires, apm telemetry gps props gimble

    Apm 2.5

    so 3.3KG just from the electronics

    this plus the 900gram frame gives 4.2KG

    but it has a huge amount of power, it rockets if i want it to.

  • Stan Clayton October 7, 2013 at 12:54pm

    Well done, Jared! Can you tell us the AUW and the frame weight? Thanks, Stan

  • Tero Koivunen October 7, 2013 at 12:47pm

    Nice aerodynamic catches,, I was figuring some octopyssy style 3d printed frame like this.

    Cleaner to push air, and tilt is good idea.

  • Admin
    Thomas J Coyle III October 7, 2013 at 12:21pm

    @Jared,

    Interesting design to say the least!:-)

    Regards,

    TCIII Admin

This reply was deleted.