Parts/Complete vehicles & kits/Ready-to-run (RTR)/E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)
E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)
E-flite

E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)

Part # EFLU64504.9(9)
Where to buy
$99.99
AMain Hobbies
Seen Oct 12, 2026
$99.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

The E-flite UMX Ultrix BNF Basic Electric Airplane with AS3X & SAFE Select is novel, redesigned "Ultra Micro eXtreme" delta wing with aerobatic and 3D capabilities that delivers a flight experience as unique as its appearance.

This twin brushless motor-powered, delta wing airplane excels at smooth sport flying, basic aerobatics and even aggressive 3D — all in the same flight. It features an incredible power-to-weight ratio with hovering capability and unlimited vertical performance. Differential thrust adds yaw control and the ability to perform advanced aerobatic maneuvers including harriers, amazing flat spins and many more. The durable EPP construction makes this one of the toughest ultra micro models available. The included Optional-use SAFE® (Sensor Assisted Flight Envelope) Select technology makes the Ultrix easy enough for low-time pilots to enjoy, while still being exciting and involved enough for experienced fliers.

Features:
  • Innovative and unique design capable of smooth sport, aerobatic AND 3D flying
  • Powerful twin brushless motors deliver the power to hover and climb out vertically
  • Differential thrust for yaw control to perform flat spins and other maneuvers
  • Ultra micro size can be flown in more places and smaller spaces
  • Extremely durable yet lightweight, fully-molded EPP airframe
  • Industry-leading Spektrum™ 2.4GHz DSMX® technology
  • Easy to fly with optional-use SAFE® Select flight envelope protection
  • Unmatched stability and locked-in feel of AS3X® technology for smoother flight performance
  • Optional LED light kit/set (sold separately; EFLU6455) for flying at night
  • Fully factory-assembled and ready to fly
Specifications:
Aileron: Yes
Approximate Assembly Time: Less than 1 Hour
CG (Center of Gravity): 6.9" (175mm) back from the nose with the battery at front of battery tray
Charger: 1S 3.7V LiPo
Completion Level: Bind-N-Fly Basic
Elevator: No
Flaps: No
Flying Weight: 2.29oz (65g)
Landing Gear: None
Length: 12.9" (320mm)
Minimum Required Radio: 5-channel
Minimum Speed Control: Receiver/ESC unit installed
Motor Size: 0805
Propeller Size: 60mm x 2.5mm
Recommended Motor Battery: 500mAh 1S 25C LiPo
Retracts: No
Rudder: No
Servos: Two 2.3g long throw servos installed
Transmitter Range: Full
Wingspan: 13.5" (342mm)

Includes:
  • (1) E-flite® UMX™ Ultrix™ with:
    • (2) Brushless Motors (installed)
    • (2) Linear Servo (installed)
    • (1) Spektrum™ Receiver with (2) brushless ESCs (installed)
  • (1) Product Manual
Needed to Complete:
  • Full-range 5+ channel Spektrum™ DSMX®/DSM2® compatible transmitter
  • 1S 3.7V 500mAh LiPo with JST Connector
  • Compatible LiPo charger

Reviews4.9 · 9 reviews

Steve ChongVerified owneron E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)

Fast delivery and this is a Super fun plane, easy to fly and and do lots of acrobatics yet is safe! May get one more to have family fun fly ? waiting for the my LED (ordered) to arrive to complete the package ???

JorgeVerified owneron E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)

4.5 Stars since it’s almost perfect. I’ll start with the bad. The binding experience with an NX7e was miserable. It just would not bind no matter what I did. It wasn’t until I read on Reddit that many people were only able to bind when using the “hybrid” frame rate. I did that and binding happened instantly. I’m telling the Tx I’m using digital servos which is not the case. For a BNF that’s been around for years this should have been fixed. Now for the good. It flies amazing on 1s, really stable and is very quick. For such a small aircraft it’s quite impressive how it flies. The EPP foam seems quite sturdy and dense, I would expect minor crashes to not be an issue. At most you’re breaking a prop which can be replaced. Speaking of props, nowhere on the product page does it say a spare set of props are included in the box. I’m glad they were included but it would have been nice to know they’d be in there since I ordered spares separately. Overall quite satisfied other than the binding issue.

Kevin BVerified owneron E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)

This plane is a lot of fun. You can fly it fast or slow. Safe mode works great. Easy to launch and land.

YoungRCVerified owneron E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)

Great fun. You can fly super fast if you have the room or if you feel like it you can fly it slow speed.

Jared Smithon E-flite UMX Ultrix BNF Basic Electric Airplane w/AS3X & SAFE Select (342mm)

Amazing, best plane in my hanger. I have 7 or 8 umx planes this one is my favorite by far. Super slow or super fast. Safe mode or 3d crazy. Cool flat spins with the differential thrust. Super durable. Small and easy to bring, 1s batteries are cheap and easy to charge. Perfect 2nd plane to learn more aerobatics, i'de get the sport cub s for total beginner . The ultrix binds and flies great with the MLP6DSM rtf horizon controller. Was kind of a pain to bind to my radiomaster T-16 but i got it working.

What reviewers say

Reviewers overwhelmingly praise the E-flite UMX Ultrix for being fun, versatile and easy to fly. It is described as handling slow, relaxed flying as well as fast aerobatics, with Safe mode appreciated for beginners and 3D-style flying for experienced pilots. Several reviewers note it is small, easy to transport, and durable, with the EPP foam considered sturdy. One reviewer reports a 1S 800mAh battery balances well when pushed into the front battery compartment gap. The main recurring issue is binding: one reviewer could not bind an NX7e until switching to a 'hybrid' frame rate found online, and another reported difficulty binding to a Radiomaster T-16 before getting it working. Overall sentiment is strongly positive.

  • + Fun to fly at slow and fast speeds
  • + Safe mode suits beginners
  • + Durable and sturdy EPP foam
  • + Small, easy to transport, cheap 1S batteries
  • − Binding difficulties with some transmitters
  • − Requires workaround (hybrid frame rate) for NX7e binding
  • − Small size makes it hard to see at distance
Summary generated from the reviews above.

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