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

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

Views: 2102


Admin
Comment by Thomas J Coyle III on October 7, 2013 at 12:21pm

@Jared,

Interesting design to say the least!:-)

Regards,

TCIII Admin

Comment by Tero Koivunen on 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.

Comment by Stan Clayton on October 7, 2013 at 12:54pm

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

Comment by Jared Reabow on 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.

Comment by Edgar Scott on October 7, 2013 at 3:32pm

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

Comment by Tissy on 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.
Comment by S. Baxter on 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

Comment by Jared Reabow on October 8, 2013 at 1:33am

yes indeed low pressure is created, but  when air is being sucked through to the low pressure area, it doesn't effect the surrounding airflow to much but when air is blow onto the arm, it pushes out sideways and makes the down flow turbulent and the blades loose efficiency

Comment by Jared Reabow on October 8, 2013 at 1:33am

oh yeah i was kinda crapping myself

Comment by Euan Ramsay on October 8, 2013 at 1:40am

Excellent design touches, ones I try to use myself.

I too have the outward tilt (only 7' though, using 2 x M3 washers on the 2 outside motor mount holes, bewtween the plate and clamp) on my camera rig, and purposely keep as much below the prop line as possible. One reason I hate compassmot; because - without spending money on an external compass - the best results need the APM lifted considerably above the noise - especially for us 6S/high amp users. And that means lifting it above the prop line. It's only a few grams admittedly, but it's the principle ;-)

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