Mini Talon X-UAV Build Number 2

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Air-Force
April 2016

Tools.jpg This page or section is under construction and will change going forward.

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NMT01a.jpg
  (My picture coming soon!)


Introduction - Mini Talon Number 2

On this, my second MT build, I have decided to go smoother on the airframe in terms of the nose pieces I have designed. On the Power side I am going to try a Cobra 2221/16-1250kv motor, the 4S/8000 Multistar and an Aeronaut 8x7 Cam Carbon folder. AUW should be close to 1750g which should make for an easy, medium range flyer.

For radio gear on this one I will first try a FrSky L9R long range 2.4G RX with my Taranis TX before going to the standard DragonLink 433 LRS. Video will initially be a 400mW RMRC VTx on 1280mHz to see if I can get the range I want on less power.

General Specifications

Distributor - BangGood USA
Aircraft - X-UAV Mini Talon
Build Date - August, 2016

Airframe Type -  Top Wing V-Tail FPV Specialist All-Up Weight -  62oz (1750g) - ESTIMATE
Wingspan -  51 inches (1300mm) Length -  33 inches (830mm)
Wing Area -  3.23 ft^2 (30dm^2) Wing Load -  19.2 oz/ft^2 (59g/dm^2) - ESTIMATE
Motor -  Cobra 2221/12-1250kv Max Continuous Power (4S) -  474 watts continuous
Propeller -  8 x 7 Aeronaut Cam Carbon Folder Max Prop Power -  448 watts @ 2550ft ASL
Static Thrust -  45oz (1268g) @ 2550ft ASL Static Thrust/Weight -  0.72 - ESTIMATE
Battery Type -  4S1P Lipo Battery Capacity -  6600mah/10C
In flight efficiency -  <130mAh/mile (<81mAh/km) Typ. Flight Time -  Up to 80 minutes


Flight Gear

The following are some of my selected components with links to some of my favorite vendors.

Power Set-up

For power on this build I chose the Cobra 2221/12-1250kv motor. I'm a huge Cobra fan because of the quality of the product, the design elements spec'd by Inov8tive Designs in California and the awesome customer service I have received from RCDude.com over the years. This motor is slightly heavier (15 grams) than the motor used most by folks on RCGroups for the Mini Talon, the Sunnysky 2216-1250kv. By comparison however the Cobra is significantly more reliable because it is never operating above safe power levels. That is, it delivers more power than the Sunnysky without over-proping and risking damage to the power system.

For more informaion on setting up a pusher folding prop - How To - Set-Up a Pusher Style Folding Prop

2221MTR.jpg

With respect to the Aeronaut folding prop and in addition to the other 3D parts found here, I designed a prop-stop insert based on an idea I got from another RCG poster (Noircogi). It is a one piece unit which stops over-fold and over-extension. The part files can be found on Thingiverse here:

Aeronaut Folding Prop Stop Insert

FPA054.jpg

Test Conditions

I always test the chosen power components with a selection of props I plan on using. For these tests I generally do a set of test runs using a regulated power supply to compare to published results and a set of runs using the flight battery to get a reality check (results below). Because I am at 2550ft ASL and generally operating in less than 15% relative humidity, my results will be a bit different from most others.

  • Altitude (ASL): 2550ft
  • Power: Multistar 4S/8000mAh, 10C Pack
  • Test run time - 10 seconds @ 100% throttle

Test Results

Each prop run is ten seconds at wide open throttle with a battery starting voltage of 4.1v per cell (16.4v). This test is repeated three times and the results are then averaged to mean values for direct comparison.

NMT9.jpg

Since the Cobra has a maximum continuous current rating of 32 amps you can see the 8x8 prop listed above consumes too much current for safe operation. I'll start with the 8x6 to take advantage of the higher thrust for the maiden and tuning flights then switch to the Aeronaut 8x7 folder to pick up some efficiency.

Flight Control

For flight control I have chosen a mini version clone of an APM 2.6 from Ready to Fly Quads. It is very small at 35mm square but still has all the functionality of a standard APM. There are a couple of challenges with this unit the first being you need to build a servo buss to carry the motor current of the servos as the FC is really designed for multicopters (no servos). The second challenge was getting the latest version of the Arduplane software loaded. To do this I had to use APM planner and a downloaded stable version of the firmware.

w/Arduplane 3.4


MiniAPM.jpg

RC Control

For radio gear I am initially going to use a FrSky L9R long range 2.4G RX. Some folks have posted very good range with this unit so I will give it a try. I will likely then change to my LRS standard, a DragonLink Micro RX with their 433 dipole antenna as this set-up is incredibly reliable and provides much longer range than the MT is capable of flying.


OSD

For an OSD I am using the Micro MinimOSD which is reliable and easy to set-up with the APM. A big advantage is the size as I am able to servo-tape a 4 pin servo connector on top of the APM case and simply plug the OSD into the connector. I am using the MinimOSD Extra firmware version r800 because it has been ultra stable for me and has the display features I like.

w/Firmware r800


MmOSD.JPG

Video Downlink

(Slightly larger version of the HS1177 camera)


Pan Servo

  • GWS S125 1t - 360 degree winch servo (ebay)


Airframe Build and Assembly

For this build I developed a kit of 3D printed parts to make component installation easier and to help with aerodynamics. The kit includes the following components:

  • Mount bracket for the GWS pan servo, FPV cam and Aero cover
  • Turret mount for the Mobius camera
  • Aerodynamic nose cover
  • VTx mount and cover
  • Gear deck for the center structure
  • Front and rear landing skids

I have uploaded the kit files to Thingiverse here:

X-UAV Mini Talon Parts Kit

NMT001.jpg

Fuse Prep & Glue

Before gluing the fuse halfs, I set up the motor mount plate with APC prop bushings and 3mm blind nuts to get the motor off the wood for better cooling.

NMT26.jpg
Motor mount prep


NMT28.jpg
3mm Blind Nuts


NMT29.jpg
Mount glued in


After gluing in the motor mount I glued in the center structure, added three cable guides to each side and some Dual lock to hold the ESC.

NMT30.jpg
Fuse prep


With the fuse glued up, I mounted the front and rear ABS skids. I printed them in ABS this time to see if it is more durable than the PLA material I have used in the past.

NMT32.jpg
ABS Front skid


NMT31.jpg
ABS Tail skid


Nose Kit pieces

After making the cut-outs, the front kit pieces are mounted and the FPV cam, pan servo and bearing plate are installed.

NMT34.jpg
Mounted front kit components


I drilled slots for wire ties and added silicone tubing to hold and cushion the camera switch assembly

NMT35.jpg
Cam switch and v/regulator mount prep


The camera switch assembly is a DPCAV.com camera switch with an add-on 5v regulator for the Mobius all mounted up front under the cover.

NMT36.jpg
Front ready to be closed up


NMT38.jpg
Nose assembly complete


NMT39.jpg
Front view


Gear Deck

The printed gear deck has threaded deck clips to mount it with four M3 x 10mm nylon stand-offs and four M3 x 6mm screws. The stand-offs are used so there is room underneath to mount a step-down buck regulator and an LC filter.

NMT41.jpg
Gear deck test fit before fuse glue


On the top of the deck I mounted the Mini APM 2.6 flight controller, FrSky L9R reciever and a made-up servo buss which is required when running this flight controller on a fixed wing aircraft. The servo buss gets its power from the ESC and is wired into channels 1,2,3,4 & 6 with channel one having two pin sets for the ailerons. There is also a pair of pins to power the Micro MinimOSD which makes it easy to reset on start-up.

Additionally there is a USB extension plug which, through a small cut-out in the fuse, makes it very easy to plug the flight controller into my laptop without having to open up the plane or move wires around, etc.

NMT21.jpg
Top side components


On the bottom I mounted an RMRC LC filter and a step-down Buck regulator to feed clean 12v power to the cameras and VTx. There is also a FrSky SBUS/CPPM converter mounted on the bottom (not shown).

NMT20.jpg
Bottom side components


Maiden

The maiden...will happen soon :)

Here's a video of the maiden flight. Again, soon...

Tools.jpg This page or section is under construction and will change going forward.

Questions or Comments? Please contact the Wiki administrator


See Also

Mini-Talon on RC Groups


Project 3D Print Files

Aeronaut Folding Prop Insert
Mini Talon Parts v2


Some of the Vendors I used for this project

R/C Dude Hobbies
Ready To Fly Quads
Aloft Hobbies
Ready Made RC


Comments? Questions?

email me!