A video of the Shrediquette GEMiNi:

Hi everyone! I just posted this already in the internet somewhere else, but I think it might be worth a blog-post on DIYdrones as well, as it contains some information on motors / propellers / aerodynamics that might be interesting to you guys...:

I spent some time during holidays to design a new FPV hexacopter based on my latest flight controller (see details here: click) and a canopy which was designed using CAD.

Cheap hobbyking motors were shown to have the same performance as the more expensive Roxxy ones (see details here: click). I found propellers that I did not know before (see details here: click) and that are more efficient than the AirAce propellers. The props are tilted 10° forward in order to decrease the angle of attack of the copters body in forward flight, which, together with the canopy, decreases the net aerodynamic drag in fast translational flight by about 30% (see details here: click). This copter flies even faster than the BOLT (see here: click) and it seems more maneuvrable. The GEMïNï is however slightly larger, the max. dimension is 315 mm from propeller tip to propeller tip (diagonally). I use the CCD-Killer camera, and a 25 mW Airwave module for video transmission. The CCD-Killer is still my favorite camera in terms of image quality and exposure control vs. weight and size.

Ever since I built my first tricopter, I wanted to build a canopy that somehow resembles the Limulus, an impressive animal that seems to have survived from the primeval times (see details here: click)... I like the design of the Limulus ("Horseshoe crab") a lot. Now I had the opportunity to print the model in 3D and to cast it using thermoformed flat film (Polystyrol).
The GEMïNï is extremely fun to fly, it seems to be very fast and agile - better than any copter I built before. For one full FPV flight of the GEMïNï, see this video:

I am very much interested in FPV multirotorracing, anyone that likes to have a fun competition, please tell me!

All the best,

William (Bremen / Germany)

Views: 3248

Tags: FPV, Gemini, Hexacopter, Hexrotor, Limulus, Racing, Shrediquette

Comment by Chuck Durham on July 16, 2013 at 6:09am

Wow that is awesome work man - awesome performance and a very sweet design

Comment by Jeroen van de Mortel on July 16, 2013 at 6:24am

If you ever sell the frame let us know I would be interested, do you fly in acro or stable mode ?

Comment by Cliff Dearden on July 16, 2013 at 6:25am

Brilliant flying William and I also like the fact that you identify your motors as RPM/V and not KV. I'd love to know

what idiot thought of putting a K in front of V in the first place.

Comment by CyborgCNC on July 16, 2013 at 6:59am

.....your skills are amazing!  I have been following your work since your first flight controller, and the work you do sir is AMAZING!  Not to mention your video editing skills in producing and creating some amazing footage!!

I look forward to reading about your latest creation, looks awesome!!!!

Comment by zmooth on July 16, 2013 at 8:01am

This is extremely well thought imho and it looks awesome !

Does the controller do anything special to deal with motor angle ? Does it hover in an angle ? Couldn't find any further info on your controller, some links are broken unfortunately. Do you think a PX4 would fit in there ?

PS:I sure hope APM3 is smaller than 2.5 ;)

Comment by Josh Potter on July 16, 2013 at 8:37am

Very neat; what's the total copter weight?  Thanks for sharing the prop and motor data also. 

You probably know this, but some circular polarized tx/rx antennas will greatly help with that multipathing on your video feed.

Comment by R. D. Starwalt on July 16, 2013 at 8:38am

Yes, definitely the way multirotor construction will migrate toward.

Very nice. A combination of plate and mold construction. A+!

-=Doug

Comment by Rob Bartlett on July 16, 2013 at 9:13am

Awesome, William.  Your original Shrediquette is what got me started in this. Thanks for the inspiration and keep up the great work!

Rob

Comment by Daniel Lukonis on July 16, 2013 at 10:20am

Fantastic! What is the flight time?

 

Comment by Euan Ramsay on July 16, 2013 at 12:44pm

WANT! Please tell you'll productionise this...

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