Hi Guys!


If you have not seen this yet check it out!


It is the Devil Ray 2.4M flying wing  made by Chris McNair.

We asked him to make one for us to use in the Australian Outback UAV Challenge. And before you ask we have an ATTO IMU onboard!

The Devil Ray has the option of 3 different wing sets 1.8m, 2.4m and a 3.6m. (We have the 2.4m)
With all the extra gear needed for the OBC, PTZ camera, 500ml water bottle, failsafe systems, transmitters, modems etc..
We loaded it up to 6.75Kg total weight. With all this extra crap on board it still had a easy take off and climbed nicely.
I still remember being impressed that even in manual mode (just over half throttle) it was doing 90-100Kph and was only pulling 15 amps.
(This is better in Autonomous!) We have a 6S 10,000mAh pack on board.
It has a very large speed envelope and handles great in the air.
The marked CG point was perfect and there is heaps of room inside which made it easy to balance. Landing speed is a crawl and has proved to be easier than the 12’ Telemaster to land.
I have an attached a couple of photos below.
I know Chris has refined the design (since making ours) and is now selling them with multiple options ranging from marine application that is water proof to a retract landing gear option for clean smooth flight.
The fixed landing gear option is nice but does add a bit more weight due to the very large wheels for our flying fields.
The Devil Ray is definitely worth having a look at if you are in the market for a high efficiency flying wing with a very large payload bay.
It also brakes down into a nice size carrying case or box.

If you like what you see you can contact Chris at chris@attopilotinternational.com as they are now available.




Scott (Melbourne UAV)



Views: 3691

Comment by Alex on March 8, 2011 at 1:57am
I like the plane :)
What engine and battery are you using to power it?
and how long can you keep it up in the air for?
Comment by Scott James on March 8, 2011 at 2:24am


Hey Alex,

I'm not sure what the motor is as I have not pulled it out to take a look but we have 2  5000mHa 6S LiPo packs on board.  We have been getting 45 mins pretty easy with all our extra weight. I think Chris told me once that if we can keep it fairly light and remove landing gear (extra drag) it can do 3 Hours!  It is a very efficient design. You can really see that he has spent hundreds of hours on the computer tuning the CFD.  Cheers!

Comment by Guntars on March 8, 2011 at 3:48am
What is the price for bird?
Comment by Scott James on March 8, 2011 at 4:21am

I'm not sure, best thing would be to contact Chris for more info.  chris@attopilotinternational.com

We are just happy customers:)


Comment by Michael on March 8, 2011 at 7:53am
Make it out of EPP and have it able to breakdown to fit in a suitcase and I'm there.
Comment by Chris McNair on March 8, 2011 at 9:48am
Working on it! We have a MINI Dray coming out soon!
Comment by I.S. on March 8, 2011 at 10:26am
make a post of it when available, please

Comment by Gary Mortimer on March 8, 2011 at 11:19am
That Mini Dray could be cut in the UK to save shipping for Europeans. Might well come with some sort of ITAR exempt stabilization and navigation as well.

Three hours with an electric wing, and this is not even the most efficient airframe in the stable ;-)

The secret sauce is in the measures to gain 3% of performance before neighsayers start saying impossible. Duration figures. Ask Chris he really knows what he's doing.

Not hobby prices for these birds though, they are professional wings.
Comment by I.S. on March 8, 2011 at 1:46pm

Sorry to put the competitors together, but how Devi Ray and Ritewing Zephyr (used on Trappy's NYC vdo I think) compare?

I understand that Zphyr is quite smaller than Devil but concept is similar


Sad to hear "not hobby prices"

Comment by John Arne Birkeland on March 8, 2011 at 2:30pm
As far as I know Ritewing is a normal RC wing, where you have to strap all the equipment on the outside. Hardly comparable to a custom designed UAV ship. But then again there is the small matter of price.. :)


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