RCU Review: E-Flite UMX Extra 300 3D


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    Contributed by: Greg Covey | Published: August 2011 | Views: 26078 | email icon Email this Article | PDFpdf icon
    E-flite Extra 300 3D 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
    Optional Basic Package
    Superb Flying Performance
    No Assembly Needed
    Innovative Frame Design
    Protective Carry Box
    No Bad Habits



    None


    E-flite UMX Extra 300 3D BNF

    The E-flite UMX Extra 300 3D makes the dream of a 3D plane that flies almost anywhere a reality. With a flying weight of barely over an ounce, including battery, it is slow and light enough to fly extreme 3D maneuvers in spaces no larger than a dining or conference room.

    Its ingenious laser-cut foam airframe, designed by ETOC champ Seth Arnold, makes it all possible. The model is available in either a BNF version that includes a battery and charger or BNF Basic version for the pilot who already has their own battery and charger. It comes completely assembled with a punchy 8.5mm coreless brushed motor and Spektrum? AR6400L Ultra Micro DSM2® Receiver/ESC installed. Built-in long-throw servos on the AR6400L drive the elevator and rudder while two independent Spektrum AS2000L long-throw ultra micro servos drive the ailerons.

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

    Specifications:

    • Wingspan: 16.8 in (427mm)
    • Overall Length: 19.4 in (494mm)
    • Wing Area: 74 sq in (4.8 sq dm)
    • Flying Weight: 1.2 oz (32.5g)
    • Motor Size: 8.5mm Coreless Brushed
    • Prop Size: 130mm x 70mm
    • Recommended Battery: 3.7V 1-Cell 150mAh LiPo (included)
    • Approx. Flying Duration: 4-8 minutes

    Key Features:

    • An ultra micro that's ideal for indoor 3D flight
    • Completely built and flight ready?just bind to any DSM2? aircraft transmitter with dual rates and expo
    • Includes a Li-Po flight battery and DC Li-Po charger
    • Small and light enough for experienced pilots to fly almost anywhere indoors
    In the Box:

    The UMX Extra 300 3D comes fully assembled and well protected in its box. The box can be used to store the plane in for travel or safe keeping. My BNF version included BMCX 1S 3.7V LiPo Charger, AA-cells for the charger, and a 150mAh 1-Cell 3.7V 12C Li-Po flight battery.

    The Extra 300 laser-cut foam airframe was designed by ETOC champ Seth Arnold. With a flying weight of only 33 grams, you can fly this plane just about anywhere. The manual is full of information for beginners to advanced pilots, including CG and throw settings. I simply used 70% for reduced rates and 30% expo all around. The manual is also on-line at Horizon Hobby here.

    A few shots from underneath the plane reveal how the linkages work and the strategic use of carbon fiber reinforcement to reduce flexing. The ingenious laser-cut foam airframe uses the least amount of foam material possible and is covered with a micro-thin film.

    The geared 8.5mm coreless brushed motor uses a 130mm x 70mm prop and a 150mAh 1-Cell 3.7V 12C Li-Po flight battery for excellent 3D power.

    Optional SFGs are included that substantially increase rudder authority in knife-edge flight and improve tracking during precision aerobatic maneuvers. Although they can be installed in seconds, I choose not to use them.

    The factory-installed Spektrum AR6400L Ultra Micro DSM2 Receiver/ESC unit features two built-in long-throw servos for the elevator and rudder. This combined with the two independent long-throw Spektrum AS2000L Ultra Micro servos on the ailerons provide precise control.

    Test Flying / Summary

    After binding the model to my JR 9505 transmitter, I set all the control surfaces to 100% throw and 30% exponential. For low rates, I used 70% throw. The suggested CG location is 82mm forward from the trailing edge of the aileron at the fuselage but can be easy adjusted to your own preference by moving the flight battery along the fuselage.

    Although the Extra 300 can be flown off a hard surface, it is equally fun to hand toss it over grass. We tested the model over grass, for safety, in a school soccer field down the street. After giving it a light toss, it needed no trim adjustments to allow it to perform aerobatics or hover in place. We used a normal upright launch and the so-called Epic launch inverted from the prop. My first impressions were that it is an awesome 3D plane!

    The video of the UMX Extra 300 3D shows just how versatile this little 3D plane really is. It can be flown in small spaces even with some wind. The wing loading is so light that I feel minimal piloting skills are needed when flying over grass for safety. The 1.2oz plane would be difficult to hurt on grass and it is truly an impressive micro-flyer than can be used for learning basic aerobatics or advanced 3D maneuvers!

    E-flite Extra 300 3D Flying Video (16 meg)

    When landing in grass, the UMX Extra 300 3D can be lowered in a harrier or simply plopped down without any damage. The power system provides excellent authority with straight up vertical runs.

    For more docile flying, the recommended low rates from the manual (below) are probably best used by intermediate skilled pilots. Although the Extra 300 3D is not meant for the beginner pilot, I feel that it would make a great model to learn the basic maneuvers. The control surfaces offer excellent authority even when the plane is flying slower or as a sport flyer.

    The Side Force Generators (or SFGs) are designed to help with knife-edge flying. Although we didn't need them, it is a nice added bonus in the kit for pilots learning the basic maneuvers. The laser-cut foam base with a micro-thin film provides an extremely light airframe that is strengthened by strategic use of carbon fiber reinforcement to reduce flexing. This Ultra Micro eXtreme (UMX) design really delivers a no-compromise flying experience! Since the UMX Extra 300 3D is slow and light enough to fly sport maneuvers or extreme 3D maneuvers in very small spaces, it deserves a thumbs up for a wide range of piloting skills.



    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 UMX Extra 300 3D

    Posted by: av8tr on 08/17/2011
    Really nice flying Greg?
    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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