The UAV Automaton Phase 01

by AG Pro | October 3, 2014 | (0) Posted in Projects

The Automaton, DLE-JW02-A2

 

This is a brief development phase of the prototype designed and built to serve as a suitable platform for FPV/UAV autonomous flight mission. The design platform is called DLE-JW02-A2; codename: “The Automaton”. Besides the amount of payload carrying capability, flight efficiency also becomes the main priority in the design consideration. The FPV gears which consist of CCD camera, AV transmitter, OSD, etc; could be incorporated with the autopilot modules in order to provide aerial view through a ground control station in an autonomous flight mission. To achieve complete information, airspeed sensor, GPS, OSD telemetry and data link Tx/Rx should be included in the autopilot system.

The Automaton consists of 2 wings (upper wing and lower wings) configured in a joined wing layout. The wings’ surface area will provide the desired aspect ratio and suitable wing loading. The wings’ lift production is sufficient for obtaining the payload carrying capability without compensating the model’s maneuverability. Flaps on the upper wing will enable slow-cruise flight capability in addition to function for take-off and landing procedures.

 

The specification is as follows:

Wingspan               :  1520 mm ( 59.84 inch )

Length                    :  788 mm ( 31.02 inch )

Height                    :  308 mm ( 12.12 inch )

Estimated A.U.W    :  1856 g – 2200 g ( 65.46 oz – 77.60 oz )

 

Tested Drive system :

  • Brushless motor : Turnigy G10, 810kv, 375W
  • ESC : Turnigy Trust 55A SBEC
  • Propeller : Revox 12x6E
  • Servos : Emax ES08MD Digital, Metal Gear servo
  • Li-po Batt : Turnigy nano-tech 4S-2200mAh (35C-70C) or Zippy 4S-2200mAh (35C)

 

Radio Tx/Rx system:

  • Futaba T8FG Super, 2.4 GHz transmitter
  • Futaba R6028SB, 8ch 2.4 GHz receiver

 

Design review :

  • 409 grams of solid lead is attached to the cockpit to simulate the payload of FPV and autopilot gears; resulting in 1.9kg of A.U.W.
  • Airbrake mixing is implemented to preset the flaps and ailevators positions for hand-launch take-off and landing.
  • The Automaton is easy for hand-launch take-off, easy for maneuvers, has sufficient lift production for carrying large amount of payload, has lots of thrust for both high and low speed flight.
  • Flaps are proved to be effective during the emergency landing procedure; it is also used during a low speed/cruise flight.
  • Implement average throttle range of 30% - 60% for efficient flight to increase flight duration.

 

The maiden flight of the Automaton was a successful one. A 409 grams of solid lead is loaded to the prototype so as to simulate the payload of FPV and autopilot gears.

 


The tested A.U.W is 1.9 kg and it is easy for take-off and easy to maneuver, even in a windy day. This prototype is expected to be able to reach a payload up to 2.2 kg without decreasing the maneuverability. A co-pilot is required to assist the hand-launch take-off. Flaps offset are pre-set using the airbrake mixing for take-off procedure.

The prototype could easily reach high altitude with the large thrust from the Turnigy G10 with 12x6E prop powered by 4S nano-tech Li-Po batt with 35C constant and 70C burst. The airframe structure strength was tested by implementing average throttle range of 60% - 80% to produce high G-force during maneuver. It flew at high speed and the flaps are disengaged to prevent pitching and gaining altitude.

The flight experience was addictive and the flight lasted for a few minutes before the Li-Po battery had reached its low voltage level. The ESC is programmed by default to automatically reduce the throttle until it kills the throttle; allowing only the servos to operate. Flaps were deployed to maximum position for the emergency landing as motor had stop and did not provide any thrust. Fortunately, the prototype was still at high altitude and had sufficient time to turn and face the headwind for the landing. The Automaton was able to glide down slowly and landed without any damage.

The Li-Po battery was replaced with the fresh one. This time 4S Li-Po batt with 35C was being implemented. The Automaton still easy for take-off, even though the Li-Po batt had no burst high rate C capability. Average throttle range of 30% - 60% provides a slow-cruise flight with a little down flaps setting (approximately 15° to 25° down angle). The flight was more efficient compared to the previous one. The flight was still easy at low speed, but the crosswind had a greater impact on the flight stability.

 



Here is the video of the event:

 

 

Future updates :

  • Implementing FPV system to the model.
  • Implementing UAV system to the model (autopilot).

 

 

 

D.L. ENGINEERING - The Sky is Home

www.dle-tech.info

For more info, email support@dle-tech.info or dle.cseng@gmail.com.

 

 



COMMENTS

Thorsclaw on October 4, 2014
An airplane that is very similar that might be good to look at is the Dara aviation D1G it also features the joined wing layout

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AG Pro on October 4, 2014
Hi Thorsclaw. Thanks for the comment. Besides D1G, there are lots of joined wing layout aircraft design. There are also lots of contrary that a joined wing layout is inefficient due to the flow condition at the wings' junction and interference of the flow field between the 2 surfaces. However, the initial approach of the design is to have large wing surface area without having a long wingspan. Secondly, it is to protect the pusher propeller from hitting the ground from landing (a flying wing design, the Black Diamond DLE-XT47). Thirdly, the belly of the mid fuselage is designed to mount the recording camera; there are no objects obstructing the view ( propeller, the cockpit's nose, etc). Finally, the silhouette of the model looks exotic in the air. :)
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alibopo on October 4, 2014
It looks a great build, with lots of great design elements. With so much wing area I was expecting some great slow speed performance, and was a bit disappointed initially but later on in the video you slowed down and it looked very comfortable. Also great high speed passes at the end! It looked to have a very good speed envelope. I was wondering what your 'design brief/goals' were - stability, slow speed, range? Having just watched a 'maker fair' excerpt (Apollo Flite Controller - http://www.youtube.com/watch?v=mibHgib7Rh8&feature=youtu.be#sthash.YEfUJGP1.dpuf) from RCTV-UK's roundup, the electronics on these flight systems seem to be getting smaller and smaller (also true of camera technology) so I'm wondering if these larger airframes need to be as big? Yes, it would appear to make sense as they'll fly in stronger winds, but I'm also wondering if the technology to fly smaller more vulnerable airframes in stronger winds has evolved enough to overcome that limitation?
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AG Pro on October 9, 2014
Hi alibopo. Great input. I greatly appreciate it. I have watched the video link. The microcontroller is the most crucial components in a mechatronics system. In the past, I used to implement a microcontroller modules (MCS-52 family, ATmega8535), using assembly language to program them. And by looking at present development (the size, the load processing capability, the interface,etc), we know the leap is huge. Not only the technology is changing, but the people who study and learn them, just keep younger and younger. Well, I am really glad as well when this model aviation hobby is growing with the technology development.

Regarding the design brief/goals, the detail criteria (stability, slow speed, range) is not going to be included at the moment. The develompent of the airframe is just to accommodate the payload of the electronics of the complete FPV and autopilot system and possibly to have a considerable long duration autonomous flight mission (approximately at starting 25 minutes and yet to be targeted at 45 minutes). Probably this might answer your question regarding the model's size. The large wings' surface area are expected to generate sufficient lift to achieve an efficient flight; possibly to glide/soar when the model is at high altitude and take advantage of the headwind.

It is inconvenient to transport the large model to the flying field. Another selection is the Sport Trainer, DLE-TR01. It is small, able to carry basic FPV gear; but the glide ratio is not well enough when a GoPro camera is being implemented as the FPV camera. Here is the article : http://www.flitetest.com/articles/basic-fpv-setup
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CMS_1961 on October 5, 2014
Cool design! Looks like your flap deployment seriously effects slow speed stability though!
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AG Pro on October 5, 2014
Thanks. The flaps ( max down angle more than 50 degrees) did save the model from a dive-crash when the batt is out. Flaps are preset to approximately (30 - 45) degrees for take-off and landing. 0 degrees during a high speed flight and (15 - 25) degrees for slow-cruise flight.
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The UAV Automaton Phase 01