E-flite Ultra-Micro UMX Yak 54 BNF 3D Basic Electric Airplane (430mm) w/AS3X Technology

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The E-flite Ultra-Micro UMX Yak 54 Bind-N-Fly is small enough and light enough to be flown just about anywhere with a flying weight of barely over an ounce (36 grams). But what really sets it apart is its specially tuned AS3X stabilization system. This exclusive technology makes it easy for sport pilots to discover the fun of hovering and harriers without sacrificing any of the agility an expert 3D pilot demands.

Specially Tuned AS3X® Receiver Makes 3D Easy
The AS3X (Artificial Stabilization – 3-aXis) technology in the model’s receiver makes it easy to discover the fun of 3D aerobatics without feeling frustrated. Using a unique combination of sensors and software, it works behind the scenes to make slow-speed and knife-edge maneuvers feel incredibly stable without limiting the aircraft’s agility or interfering with your control. The plane simply stays in whatever attitude you want without making you struggle to keep it there. The receiver also features five pre-programmed flight modes – three default modes that are active out of the box and two alternate modes you can activate later. Each has different AS3X stability settings tailored for your skill level or the 3D maneuver you want to try.

  • Default Modes
    • General Flight Mode: Heading hold in roll-axis for a locked-in feel.
    • Standard AS3X Mode: Tuned for the expert 3D pilot but great for flying pattern aerobatics, too.
    • Hover Assist Mode: Aggressive heading hold in roll, yaw and pitch so it's easier to enter and maintain a hover. 
  • Alternate Modes 
    • Knife-Edge Assist Mode: Heading hold settings for roll, yaw and pitch that make it easy to try knife-edge maneuvers.
    • Torque Roll Assist Mode: Aggressive heading hold settings for yaw and pitch that make torque rolls easier.

Flight-Ready Out of the Box
No assembly is required. The model comes with the motor, Receiver/ESC and servos already installed. All you have to do is charge a battery, bind it to a compatible DSMX/DSM2® transmitter and fly. An E-flite® 150mAh 1S 3.7V 45C LiPo battery is recommended for best performance.*

Feather-Light, Carbon-Reinforced Airframe
Carbon fiber rods brace the wings so you can enjoy outstanding power-to-weight performance and still have the rigidity necessary for crisp control response. The model also features carbon fiber landing gear with wheel pants.

Built-In Side Force Generators
Side Force Generators attached to the wing tips boost rudder authority in knife-edge flight so you can fly tighter knife-edge loops.


  • No assembly required
  • Exclusive AS3X stabilization technology
  • Multiple flight modes that make 3D easy
  • Feather-light, carbon-reinforced foam airframe
  • Side-Force Generators for improved knife-edge flight
  • Potent 8.5mm coreless motor
  • Spektrum DSMX receiver
  • Spektrum long-throw performance linear servos
  • Stunning red and silver trim scheme
  • Carbon fiber landing gear with simulated wheel pants
Wingspan: 16.9 in (430mm)
Overall Length: 19.6in (497mm)
Flying Weight: 1.3 oz (36g)
Motor Size: 8.5mm x 23mm brushed
Radio: 6 channel
Servos: 2.3g (installed)
Recommended Battery: 3.7V 1S 150mAh 45C lipo
Approx. Flying Duration: 4-5 minutes
Is Assembly Required: No

Needed To Complete:

  • Full-range, 6+ channel DSMX®/DSM2® transmitter
  • 150mAh 1S 3.7V 45C LiPo flight battery
  • 1S LiPo charger

This product was added to our catalog on September 30, 2016

Verified Owner
Friday, Feb 7 2020 (6 months ago)
E-flite Ultra-Micro UMX Yak 54 BNF 3D Basic Electric Airplane (430mm)
this is my first indoor plane, I love the slow flying maneuvers, I can practice in "slowmotion" and if you crash there is usually no damage, tho I broke a wheel pant and bent the nose flying in too small areas. One note, my newest charger did Not go to 1s??? fortunately one of my other chargers did, might want to check before buying, jo
Verified Owner
Saturday, Jul 18 2020 (2 weeks ago)
E-flite Ultra-Micro UMX Yak 54 BNF 3D Basic Electric Airplane (430mm)
Great little airplane
Perfect for slow motion 3D in a small space
It is fragile but it is well built and holds up well for what it is
I run it with the Tattu 220 mah batteries and a upgraded motor from Micro Motor Warehouse.
This combination of larger battery and motor gives this little beast plenty of thrust and flight time.
These motors last 5 times longer than the stock one.
I will always have one these lightweight miracles in my hangar.
It's nice to have something that flies this effortlessly - it borders on meditation
After flying 3D helis and crazy fast airplanes, it's great to just chill out and relax
Enjoy !