The ultimate guide to the E-flite UMX Ultrix BNF Basic with AS3X and SAFE Select

As an enthusiastic RC model flyer, you are probably constantly looking for the next exciting flight model that could expand your repertoire. The E-flite UMX Ultrix BNF Basic with AS3X and SAFE Select could be exactly what you are looking for - an ultra-light delta wing model with impressive versatility and innovative design. In this comprehensive article we look at all aspects of this fascinating model, from technical data to practical tips and alternatives.

Technical data and specifications

E-flite’s ultra-light flyer features compact dimensions while impressive performance. Here the most important technical data at a glance:

The Ultramicro model comes in the BNF (Bind-N-Fly) format, which means that you only need a compatible transmitter, battery and charger to get into the air. The small pilot is already equipped with a spectrum receiver, two brushless motors and two linear servos.

Unique flying characteristics and versatility

The delta wing model of Horizon Hobby is characterized by its remarkable versatility. The innovative design allows gentle sports flights, basic acrobatics and even aggressive 3D maneuvers - all within a single flight. This flexibility makes the model particularly attractive for pilots who want to try out different flight styles without having to purchase several models.

The dual motorization gives the Ultrix an impressive power weight that allows hovern and unlimited vertical power. The differential thrust offers greed control and the ability to perform advanced acrobatic maneuvers such as urriers and spectacular flat spins.

Material quality and durability

The slim and simple delta wing construction consists of lightweight but extremely durable EPP (Expanded Polypropylene). This material selection makes the Ultrix one of the most robust UMX aircraft ever developed. The EPP material offers several advantages:

• High impact strength with low weight
• Good dimensional stability
• Easy repair options
• Longevity even in frequent landings on uneven surfaces

These properties are particularly valuable for beginners, as unavoidable crashes cause less costly damage during the learning phase. Even for experienced pilots flying aggressive manoeuvres, the robust design offers more safety in experimental flight figures.

AS3X and SAFE select technologies

One of the outstanding features of the small Deltaflügler is the integration of the exclusive spectrum AS3X (Artificial Stabilization - 3-aXis) and SAFE (Sensor Assisted Flight Envelope) Select technologies.

AS3X technology:This works in the background to smooth the effects of wind and turbulence and provides a stable flight feeling as if you control a much larger aircraft. The technology automatically corrects unwanted movements and ensures a more precise flight experience.

SAFE Select Technology:This optional feature offers angle and bench angle limits as well as automatic self-leveling, which can be activated or deactivated at the touch of a button. This makes the Ultrix easy to fly for both beginners and experienced pilots. Especially beginners benefit from this feature, as it significantly reduces the risk of falling down and allows a gentle entry into the hobby.

Customer experiences and reviews

The experiences of users with the E-flite UMX Ultrix are mostly positive. Many pilots praise the extraordinary versatility and the ability to change between different flight styles. Particular emphasis is placed on:

Strengths according to customer reviews:

• Excellent aerodynamics and flying properties
• Impressive stability thanks to AS3X technology
• Amazing robustness despite low weight
• Versatile for different flight styles
• Good visibility in the sky despite compact size

Critical points from customer opinions:

• Limited flight time with standard battery (approximately 5-7 minutes)
• Accumulation time for the specific control characteristic
• Sensitivity with stronger wind due to low weight
• Some report problems with recipient connectivity

A recurring theme in the reviews is the surprise about the robustness of the model. Many users report that after allegedly catastrophic crashes, they could only detect minimal or no damage - a certificate of the quality of the EPP material used.

Flight performance and practical experience

Flight times

With the recommended 1S 500mAh LiPo battery, pilots can typically reach flight times of 5-7 minutes. The actual flight duration depends heavily on the flight style:

• Quiet sports flight: up to 7 minutes
• Mixed flight style with some acrobatics maneuvers: about 6 minutes
• Intensive 3D maneuver and full gas operation: 4-5 minutes

Many pilots recommend buying multiple replacement batteries to extend the flight time at a time. A slight increase in battery capacity to 550-600mAh is possible without significantly impairing the flight characteristics, but should be tested with caution.

Increased power

The double motorization gives the ultra-light Deltaflügler an impressive rise. Despite its low weight of only 65 grams, the model can perform almost vertical climbing flights and even hovern. The opposite propellers ensure high stability even in demanding maneuvers.

With freshly charged battery, the rise rate is remarkable - the model quickly reaches considerable heights, which is particularly advantageous with limited flying areas. Even after several minutes of flight, enough power remains to get up safely from ground maneuvers.

Transport capacity

One of the biggest advantages of the UMX Ultrix is its excellent transport capability. With a span of only 342 mm and a weight of 65 grams, the model fits easily into any medium size pocket or a small transport case. The robust EPP design also means that the model is less susceptible to transport damage than many other flight models.

Pilots particularly appreciate the possibility to take the model spontaneously:

• Fits in the trunk of every car
• Can be transported in a special RC bag
• Needs little space to fly
• Requires minimal accessories (senders, batteries, charger)

These properties make the Ultrix a perfect companion for occasional pilots or for spontaneous flight units after work or on weekends.

Construction and preparation

The Delta aircraft from E-flite comes as a BNF version, which means that it is already pre-assembled and does not require extensive assembly. The preparation time is essentially limited to:

1. Unpacking and checking the model
2. Loading the flight battery
3. Binding the receiver with a compatible transmitter
4. Check the control functions
5. Adjust the Dual Council and Expo values according to personal preference

The included guide is detailed and easy to understand, with clear step-by-step instructions and helpful illustrations. The statements on SAFE select activation and recommended transmitter settings are well documented. From the first examination to the first flight, typically no more than 30-45 minutes pass, provided the battery is already charged.

Spare parts supply and maintenance

The spare part supply for the compact Deltaflügler is generally good. As a product of an established manufacturer such as Horizon Hobby/E-flite, the most important spare parts are available via specialist trade or directly from the manufacturer. Among the most frequently needed spare parts include:

• Propeller
• Engines
• Servos
• Batteries
• Recipient/ESC unit

Maintenance of the model is minimal. Regular inspections on damage and loose connections and occasional cleaning are sufficient. When used intensively, the propeller can be replaced after 20-30 flights to ensure optimal performance.

Smaller repairs on the EPP material can be carried out with commercial second adhesive or special EPP adhesives. The simple construction also makes repairs accessible to less technically experienced pilots.

Target group of the Ultra Micro Model

The E-flite UMX Ultrix BNF Basic is aimed at a broad audience of RC pilots:

Beginners with some experience:Thanks to the SAFE select technology, even less experienced pilots can safely fly the model. The self-leveling function and the angle limits provide a certain protection against overcontrol and control loss. Absolute beginners should first gain experiences with an even more stable training model.

Advanced pilots:This group can exploit the full range of skills of the Ultrix - from sporty cruises to challenging 3D maneuvers. AS3X technology improves precision while the compact size allows flights in limited spaces.

Indoor pilots:With a weight of only 65 grams and compact dimensions, the model is ideal for indoor flights in larger halls or sports halls.

Flyers:The simple transportability and minimal preparation time make the model ideal for pilots who want to fly spontaneously without having to transport a lot of equipment.

Community support and online resources

An active community has developed around the small Deltaflügler. In numerous online forums and social media owners exchange experiences, modifications and flight techniques. Particular emphasis should be given to:

• Dedicated threads in big RC forums with tips and tricks
• YouTube channels with flight tutorials especially for the Ultrix
• Facebook groups for E-flite UMX models
• Instagram hashtags with impressive flight videos and modifications

These community resources are particularly valuable for new owners, as they provide practical tips on settings, frequent problems and enhancements. Support from experienced pilots can significantly reduce the learning curve and improve the flight experience.

Alternative models compared

The market for ultra-light RC flight models is diverse. Here is a comparison with some alternatives to the E-flite UMX Ultrix:

The main difference to most competitors is the unique combination of delta wing design, double motorization and 3D capability of the Ultrix. While other models are often specialized in certain flight styles, the E-flite UMX Ultrix offers a remarkable versatility.

Value for money

The Deltaflügler is positioned in the middle price segment for ultramicro models. Taking into account the technology offered (AS3X, SAFE Select, Double Motorization), durability and versatility, the model offers excellent value for money.

Particular emphasis should be given to:

• Long-term usability by adapting to different levels
• Robustness, repair and spare parts costs minimize
• The technological features that are often only found in more expensive models

The investment in this model is especially worthwhile for pilots looking for a versatile aircraft that can keep pace with their growing capabilities and is not only suitable for specific flight disciplines.

Tips, tricks and optimizations

Battery optimizations

• Testing higher capacity: Cautionary experimentation with 1S 550-600mAh LiPos can extend the flight time without affecting the balance too much.
• Marking batteries: Sign your batteries with numbers to track their performance over time.
• Proper Storage: Store batteries at about 3.85V for maximum service life.
• Parallel charger: Invest in a multiple charger to charge multiple batteries simultaneously.

Flight optimizations

• Set up dual councils: Configure different deflection rates for different flight styles.
• Expo values: Start with 30% Expo for cross-spindles and highspins for softer control.
• Wind note: Always fly against the wind when you want to land.
• 3D maneuver: Start at sufficient height with 3D maneuvers to have room for corrections.

Hardware modifications

• LED lighting: Install the optional LED kit (EFLU6455) for improved visibility in daylight conditions and to fly in darker conditions or even at night.
• Carbon reinforcements: Light carbon fiber reinforcements can be strategically placed to increase stiffness.
• Propeller optimization: Experiment with different propeller types for more efficiency or boost.
• Weight optimization: Identify unneeded components that can be removed to save weight.

These optimizations should be carried out step by step, and after each change the flight behaviour should be carefully tested.

Frequent questions and problems

Binding problems

Question: My transmitter does not bind to the Ultrix receiver. What can I do?

Solution:

1. Make sure your transmitter is DSMX/DSM2 compatible.
2. Follow the binding sequence in the instructions.
3. Keep the transmitter very close to the receiver during the binding process.
4. Try a battery reset of the model and transmitter.
5. Check if the receiver is supplied with power correctly.

Flight stability problems

Question: My Ultrix is unusually unstable, although AS3X is activated. How do I fix it?

Solution:

1. Check the focus position according to instructions.
2. Make sure that all control areas are neutral if no control commands are given.
3. Calibration the sensors according to instructions in the instructions.
4. Check for damage to propellers or control surfaces.
5. Test with a freshly charged battery.

Engine problems

Question: One of the engines runs unround or not at all. What can I do?

Solution:

1. Check all cabling and connections.
2. Inspect the propeller for damages or foreign bodies.
3. Test the engines individually if possible.
4. A motor exchange may be required in case of ongoing problems.

SAFE select activation

Question: How do I activate the SAFE select function after binding?

Solution: The SAFE select activation takes place during the binding process. Hold the binding key while you turn on the receiver, and let it go after the binding process has started, but before the process is completed. The exact sequence can be found in the instructions.

Conclusion and recommendation

The E-flite UMX Ultrix BNF Basic with AS3X and SAFE Select is a remarkable small RC flight model that offers a rare combination of versatility, robustness and advanced technology. The ability to switch between gentle sports flies and aggressive 3D maneuvers makes it an excellent choice for pilots with different levels of experience and interests.

The robustness of the design is particularly impressive despite the ultra-light weight. The EPP material used forgives mistakes and makes the model an ideal companion for experimental pilots. The additional technologies such as AS3X and SAFE Select further increase the value by improving both stability and offering optional support for less experienced pilots.

For whom is this Deltaflügler ideal? Essentially for anyone looking for a versatile, transportable model that can be flown in different environments and can withstand the growing skills of the pilot. The combination of performance, durability and supportive technologies makes the compact flyer an excellent investment for RC enthusiasts of all levels of experience.