RCU Review: E-Flite Ultra Micro eXtreme (UMX) Beast®

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    Contributed by: Greg Covey | Published: July 2011 | Views: 31365 | email icon Email this Article | PDFpdf icon
    E-flite BEAST BNF

    Review by: Greg Covey
    Photo Camera : Papa Jeff Ring
    Video Pilot: Greg Covey

    E-flite Models
    Distributed Exclusively in the U.S.A. by:

    Horizon Hobby, Inc
    4105 Fieldstone Road
    Champaign, IL 61822
    Ph: (800) 338-4639
    Toll Free: (800) 338-4639
    Fax: (217) 352-6799
    Website: www.horizonhobby.com

    Complete BNF Package
    Authentic scale looks
    Superb Flying Performance
    No Assembly Needed
    Easy Battery Access
    Protective Carry Box
    No Bad Habits

    Wing Loading is Not for Beginners

    E-flite BEAST BNF

    The Ultra Micro eXtreme (UMX) Beast® is a small-scale recreation of one of the most awe inspiring airplanes on the airshow circuit today. Designed by aerobatic world champion Quique Somenzini, it delivers high-powered aerobatic excitement that will put a grin on the face of any intermediate to experienced RC pilot.

    At the heart of its phenomenal performance is a brushless motor, propeller and battery combination that delivers a spine-tingling thrust-to-weight ratio. This incredible power output, combined with its well-balanced controls and carbon reinforced wing, allow the UMX™ Beast to achieve a level of precision and performance that has more in common with its giant-scale Hangar 9® twin than any other ultra micro.

    The UMX Beast BNF comes completely assembled with a BL180 brushless outrunner motor and Spektrum AR6400LBL Ultra Micro DSM2 Receiver/BL ESC installed. Built-in long-throw servos on the AR6400LBL drive the elevator and rudder while two independent Spektrum AS2000L long-throw ultra micro servos drive the ailerons. A 2-cell, 7.4V, 120mAh, 20C Li-Po battery and DC Li-Po charger are also included.

    The only component needed to complete this BNF package is a 4-channel DSM2 transmitter with dual rates and exponential programming.


    • Wingspan: 14.7 in (374mm)
    • Overall Length: 15.7 in (400mm)
    • Wing Area: 83.8 sq in (5.40 sq dm)
    • Flying Weight: 2.36 oz (67g)
    • Motor Size: 180BL Brushless Outrunner, 2300Kv (included)
    • Radio: AR6400LBL 6CH Brushless ESC Receiver (included)
    • CG (center of gravity): 18mm from Leading Edge of Bottom Wing
    • Prop Size: 5 x 2.75 in (127mm x 70mm)
    • Recommended Battery: 2S 7.4V 120mAh Li-Po (included)
    • Approx. Flying Duration: 5 minutes
    • Charger: Celectra 2S 7.4V DC Li-Po Charger (included)

    Key Features:

    • Flies with the feeling of a larger scale aerobatic plane
    • Completely built and flight ready – just bind to any DSM2 aircraft transmitter with dual rates and expo
    • Equipped with a brushless 180 outrunner motor
    • Small enough for experienced pilots to fly in the backyard
    • Includes 2S Li-Po flight battery and DC Li-Po charger
    In the Box:

    The UMX Beast comes fully assembled and well protected in its box. The box can be used to store the plane in for travel or safe keeping. I didn't see any manual so the only other items were the Celectra 2-cell Balancing Charger, DC supply clip leads and a 2s 120mAh LiPo flight battery. The manual is on-line at Horizon Hobby here.

    The biplane is beautifully designed and finished. The flying wires, tail surfaces, and control wires were all assembled perfectly. A key area that makes this design different from previous E-flite and ParkZone micro BNF models is the brushless motor that runs on a 2-cell LiPo pack.

    The Spektrum AR6400LBL 6-channel ultra micro receiver comes with two integrated linear long throw servos and a programmable brushless speed control. It also features X-Port™ and DSM2 technology. The AR6400LBL is compatible with all Spektrum, JR, E-flite and ParkZone 2.4GHz DSM2 technology transmitters.

    A few shots from underneath the plane reveal how the linkages work. The E-flite UMX Beast even has a steerable tailwheel!

    The top portion of the cowl is held in place by several magnets and conveniently removes to access the battery bay.

    I didn't have an adapter for the JST-SHR (1.0mm) battery connector so I used the supplied Celectra 2S 7.4V DC Li-Po Charger. It connects to any 12v DC supply and charges the 2-cell LiPo pack with a single button press.

    The LED lights act as follows:

    • Green Blinking - Power and battery are connected
    • Red Blinking - Charging
    • Red and Green Blinking - Balancing
    • Solid Green - Full charge
    • Both LEDs Flashing Rapidly - Error

    Test Flying / Summary

    After binding the model to my JR 9505 transmitter, I set all the control surfaces to 100% throw and 50% exponential. I then tested the UMX Beast over grass, for safety, in the school soccer field. After giving it a light toss, it needed no trim adjustments to allow it to perform aerobatics or hover in place. My first impressions were that it had awesome power and agility!

    The video of the UMX Beast shows just how versatile this little micro aerobat really is. It can be flown in small spaces even with some wind. Although the wing loading requires intermediate to advanced piloting skills, it is truly an impressive micro-flyer!

    E-flite BEAST Flying Video (12 meg)

    When landing in grass, it was a bit hot so I broke one of the wheel pants. I didn't have any foam-safe CA with me so I repaired it with a small piece of servo tape. The second flight was off pavement in a school parking lot. The steerable tailwheel worked very well and added scale functionality to its realistic looks.

    For more docile flying, the recommended low rates in the manual are probably best used by intermediate skilled pilots. The UMX Beast is not meant for the beginner pilot so I have skipped over the basic maneuvers. That being said, the control surfaces offer excellent authority even when the plane is flying slower or as a sport flyer. Further, just about every sub-part is available separately.

    Although I didn't find any bad characteristics when flying the UMX Beast, and it did feel like flying a larger plane, I felt the wing loading was a bit high so I would not recommend it for small indoor areas. The power system was so awesome that perhaps the model could have been a little larger without losing any of its maneuvering capability. It is also more durable than it looks so intermediate pilots should be successful when flying over grass. The construction quality, appearance, and performance of the model is top-notch so it deserves a thumbs up for experienced pilots!

    E-flite Models
    Distributed Exclusively in the U.S.A. by:
    Horizon Hobby, Inc
    4105 Fieldstone Road
    Champaign, IL 61822
    Ph: (800) 338-4639
    Toll Free: (800) 338-4639
    Fax: (217) 352-6799
    Website: www.horizonhobby.com

    Comments on RCU Review: E-Flite Ultra Micro eXtreme (UMX) Beast®

    Posted by: KwilliamsFLA on 07/21/2011
    This by far is the greatest flying model airplanes.
    Posted by: barnyardflyer on 08/10/2011
    The manual is located between the foam the Beast is sitting on when opened and the box. Just lift the foam out, it taped to the bottom.
    Posted by: cliffordrmagee on 05/05/2013
    This really is a great airplane. Has anyone tried a bigger motor and different prop? If so, any comments are welcome.
    Page: 1
    The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.

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