E-flite UMX Beast 3D

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E-flite UMX Beast 3D
The preinstalled E-flite micro outrunner motor. The magnets used to secure the top of the cowl are visible on either side

The E-flite UMX Beast 3D is a foam ultra micro-sized scale biplane designed, manufactured and distributed by E-flite, a division of Horizon Hobby of Champaign, Illinois USA.

Designed by world champion R/C pilot Quique Somenzini, the Beast 3D features Horizon's AS3X technology. Introduced in 2011, this MEMS-based three-axis gyroscopic technology was first developed for use in flybarless helicopters. It makes constant rapid, minute corrections to all control surfaces while in flight. The result is a micro model with the feel, manuverability and aerobatic capability of a giant scale model. A 100cc giant scale version is in fact available from Hangar 9®, another division of Horizon Hobby. This new micro model replaces the original, non-AS3X version.

It is a BNF bind-and-fly model which may be bound to any Spektrum or JR DSM2 or DSMX transmitter. A transmitter with dual rates is recommended. It will bind to the transmitter's default modes with no need to reverse servo direction or to change end points. Futaba radios equipped with a Spektrum RF module will work as well, but the throttle channel must be reversed. Recommended throws are 70% low rate and 100% high rate for all control surfaces. Exponential adjustment is not required.

An E-flite 180mAh 2S 7.4v 20C lithium polymer battery (EFLB1802S20) is required. Since the plug and receptacle are unique to E-flite, an E-flite Celectra charger (EFLUC1007) is required as well. If one wishes to use an existing charger with banana plug output leads, a charger plug adapter (EFLA7001UM) is available.

A spare propeller is provided along with a detailed instruction manual in English, German, French and Italian.


The model is based on The Beast, an actual air show biplane owned by Kevin Kimball and sponsored by Horizon Hobby, Jim Kimball Enterprises, Incorporated and Aircraft Studio Designs. Mirco Pecorari of Aircraft Studio Design is credited with the paint scheme.

The aircraft was destroyed in a crash on August 20, 2011 at the Kansas City Aviation Expo Air Show, killing pilot Bryan Jensen.

It was a modified Pitts Model 12, changed from a tandem two-seater to a single-seat aircraft. Power came from a Russian-made Vedeneyev M14P nine-cylinder radial engine modified by Monte Barrett of Barrett Precision Engines. Barrett installed fuel injection, created higher-quality pistons and rings and modified the gearbox for a net gain of 50 horsepower.

Flight characteristics

The AS3X technology, more than a year in the making, makes a tremendous difference in how the Beast flies. The model flies straight and level in winds up to 10 MPH (18km/h) with no evidence of unwanted course correction. The course corrections are visible in flight in light wind, manifested as small changes to elevation while the airframe and wings remain parallel to the ground. The long-throw 2.3g linear servos allow extreme deflection of the control surfaces and allow the Beast 3D to perform a vast range of aerobatics including knife edge figure eights and rolling turns. The stability of the system allows the Beast to be flown in indoor spaces by experienced pilots. That same stability keeps the model in whatever attitude the pilot puts it in; it will knife edge with virtually no rudder input and fly inverted with little or no elevator input.

Speed with the E-flite 2500Kv outrunner motor, the installed 5x2.75 propeller and recommended 180mAh 2S lithium polymer battery is brisk. Landings are exceptionally easy to perform; it will do three-point landings with very little application of power.


  • Wingspan: 14.7" (374mm)
  • Length: 15.7" (400mm)
  • Wing area: 83.8 sq. in. (54.2 sq. dm.)
  • Flying weight: 2.54 oz (72 g)
  • Motor: E-flite BL180 2500Kv brushless outrunner
  • Onboard electronics: E-flite DSM2 six-channel ESC/receiver combination (EFLU4864)
  • Servos: 2.3g high-speed long throw linear
  • Recommended battery: E-flite 2S 7.4V 180mAh lithium polymer (EFLH1802S20)
  • Airfoil: Symmetrical
  • Minimum required radio: Four-channel minimum Spektrum or JR DSM2 or DSMX compatible
  • Center of gravity: 19mm back from leading edge of bottom wing
  • Wing loading: 3.4 oz/sq ft (1.01 g/sq dm)
  • Propeller: E-flite 5x2.75
  • Flying duration: Approximately five minutes
  • Minimum skill level: Intermediate
  • Minimum age: 14
  • Catalog number: EFLU4850
  • Average selling price (USD): $139.99

External links and references