The ultimate guide to the E-flite Viper 90mm EDF Jet BNF Basic

If you are looking for a powerful, large-format electric-ducted fan jet that is suitable for both beginners and experienced pilots, then you should consider the Viper 90mm EDF Jet from E-flite more closely. This impressive model combines speed, agility and ease of use in a well thought-out overall package. In this detailed article you will learn everything you need to know about this outstanding flight model.

Technical data and specifications

The E-flite Viper 90mm EDF Jet BNF Basic with AS3X and SAFE Select (EFL17750) impresses with a range of technical features that make it a first-class choice for jet pilots.

The Viper Jet combines the impressive optics of a combat jet with the stability of a sports low decker. The model was designed by E-flite as an increase in the popular 70mm version and thus represents the first 90mm EDF-powered and so far the largest jet model of the manufacturer.

Customer reviews and reviews

What pilots especially appreciate

The feedback from customers who have already flew the E-flite Viper 90mm is mostly positive. The following aspects are particularly highlighted:

Flight characteristics: Many pilots praise the exceptionally good-natured flight characteristics. The combination of combat jet performance and sports low-decker stability makes this jet a favorite among beginners and experienced pilots alike. AS3X technology ensures stable flight behavior even in windy conditions.

Performance: With a maximum speed of over 120 mph, the Viper 90mm offers impressive performance data. Pilots report excellent vertical gradient and a wide range of speeds that allows both slow, controlled passages and rapid high-speed flights.

Processing quality: The design is described as robust and durable. The foam material is high quality processed and the pre-installed components meet a high production standard.

Critical votes

A few critical comments refer to:

Cost of accessories: While the basic model is offered as a Bind-N-Fly Basic, additional components such as battery, charger and transmitter must be purchased separately, increasing total investment.

Weight: Some pilots report that the model with a complete 6S 7000mAh battery becomes relatively heavy, which can make landing a bit more challenging.

Test results and performance analysis

In numerous tests, the high-performance jet has consistently convinced. The combination of the powerful 3670-1950Kv brushless motor and the 12-sheet 90mm EDF impeller not only creates impressive thrust, but also a realistic turbine-like sound.

Flight time

The flight time varies depending on the battery used and flight style:

• With a 6S 4000mAh battery: approx. 4-5 minutes in aggressive flight style
• With a 6S 7000mAh battery: up to 8 minutes with moderate flight style

These values can be improved by an efficient flight style with metered gas use. Many pilots report that they achieve satisfactory flight times with a balanced mixture of high-speed passages and controlled manoeuvres.

Increased power

The vertical performance is impressive. The E-flite Viper 90mm can be pulled almost vertically into the sky, which is remarkable for a model of this magnitude. Test pilots report seemingly endless vertical climbing flights before the speed decreases.

Material quality and durability

The model is made of high-quality EPO foam, which is characterized by good strength and low weight. The surface is cleanly processed and provided with a high-quality filming that gives the model a realistic appearance.

The reinforcements at the critical points, such as support surface roots and guide mechanism approaches, provide additional stability. The electric draw-in suspension with the shock-absorbing trailing link streams is designed to be sturdy and allows start-ups and landings even on not perfectly smoothed grass pistes.

Transport and storage

The Viper Jet with a span of 1400 mm provides certain requirements for transport and storage. It should be noted positively that the support surfaces can be removed without tools, which considerably facilitates transport. With removed surfaces, the model fits in most medium-sized vehicles.

For transport and storage, pilots recommend special transport bags or cases that offer additional protection. Since the model is made of foam, it should be protected from direct sunlight and extreme temperatures.

Spare parts supply

E-flite is known for a good spare part supply. The main components such as support surfaces, control units, chassis and electronic components are available as spare parts. Due to the popularity of the model, many dealers also have corresponding parts in stock.

It should be emphasized that many standard components such as servos and electronics are compatible with other E-flite models, which additionally simplifies the supply of spare parts.

Who is the Viper 90mm EDF Jet suitable for?

The E-flite Viper 90mm EDF Jet with AS3X and SAFE Select technology is aimed at a broad audience:

Beginners in the Jet World: With the optional SAFE Select technology, which can be activated if necessary, the model is excellent for pilots who want to gain first experience with EDF jets. Flight stabilization ensures good-natured flight behavior and prevents extreme flight conditions.

Advanced pilots: With deactivated SAFE Select, the Jet offers direct flight behavior and enables sophisticated art flight maneuvers. The impressive performance and speed ensure high-level flight fun.

Experienced jet pilots: Also for jet veterans, the Viper 90mm offers enough power reserves and maneuverability to master sophisticated flight patterns.

However, in all cases a suitable transmitter with DSM2/DSMX technology and experience in handling fast flight models is required.

Assembly and commissioning

Construction

The assembly of the state-of-the-art aircraft is relatively simple thanks to the high degree of prefabrication. The specified installation time of 1-3 hours is realistic, with experienced model builders often being even faster.

The assembly essentially comprises the following steps:

• Mounting of the supporting surfaces on the fuselage
• Installation of the height control unit
• Attaching the side guide
• Connecting the plug contacts for servos and LED lighting
• Creating and securing the flight battery

The attached guide is described by users as clearly structured and well illustrated. The detailed step-by-step instructions and the precise illustrations that are also understandable for less experienced model builders are particularly helpful.

Binding and programming

As a BNF Basic version, the jet must be bound with a compatible transmitter. The pre-installed spectrum AR637TA receiver is compatible with all modern spectrum DSMX transmitters. The programming of flight modes and the configuration of AS3X and SAFE Select are described in detail in the instructions.

Community and Support

An active community has developed around the E-flite Viper 90mm. In numerous forums and social media owners exchange experiences, tuning tips and flight impressions. This community support is particularly valuable for beginners who can benefit from the experience of other pilots.

The manufacturer Horizon Hobby, which is part of E-flite, also offers competent support. The service staff can be reached by e-mail and telephone and help with technical questions or problems.

Comparison of competitive products

To provide a comprehensive overview, it is worth comparing with similar products from competitors.

Freewing Avanti S 80mm EDF Jet

Strengths versus Viper:

• A little cheaper price
• Sporty design
• Good availability of tuning parts

Weaknesses to the Viper:

• Small EDF (80mm vs. 90mm)
• Less advanced stabilisation systems
• Lower maximum speed

FMS F-16 90mm EDF Jet

Strengths versus Viper:

• Realistic combat jet design
• Comprehensive scale details
• Comparable EDF size

Weaknesses to the Viper:

• More demanding flight behaviour for beginners
• No comparable stabilization system as AS3X/SAFE
• Higher landing speed required

The E-flite Viper 90mm EDF Jet stands out from the competition thanks to its unique combination of performance, ease of use and advanced electronics. The SAFE Select technology makes it particularly interesting for beginners in the jet world, while the power reserves also inspire experienced pilots.

Value for money

With a price level in the upper midfield, the powerful electric jet is not a favorable purchase. However, the quality of the installed components, the sophisticated design and the advanced electronics justify the price. It should be noted that additional costs for transmitter, battery and charger must be calculated if they are not already present.

Compared to other 90mm EDF jerseys, the Viper offers a balanced price-performance ratio, especially when considering integrated technologies such as AS3X and SAFE Select.

Tips, tricks and optimizations

Battery optimization

Expert pilots recommend for optimal performance:

• Use high quality 6S LiPo batteries with 30C or more
• Optimum capacity between 5000-6000mAh for a good balance from flight time and weight
• Careful balancing of the model by correct battery positioning

Flight style recommendations

To get the best out of the high-performance model aircraft:

• Start with about 75% thrust for controlled lifting phase
• retracting the chassis at a safe height to reduce the air resistance
• Avoid extreme full gas passages at low speeds
• Use of landing flaps for slower, controlled landing

Hardware modifications

Popular improvements include:

• Installation of a more powerful EDF impeller for even more thrust
• Retrofit with a smoke system for spectacular visual effects
• Reinforcement of suspension recordings for more robust landing characteristics
• Additional scale details for an even more realistic appearance

Software tuning

The following adaptations are available for advanced pilots:

• fine tuning of the AS3X parameters for personalized flight behavior
• Programming of flight phases for different flight styles
• Adapting the dual rate and Expo values for optimal control characteristics
• Configuration of telemetry alarms for better battery management

Frequently asked questions and problems

Range problems

Question: Some pilots report on occasional range problems. What can I do?

Solution: Range problems can have different causes:

• Check the position of the receiver antenna in the model
• Make sure that no metal parts or carbon fiber components shield the antenna
• perform a range test according to the transmitter instructions before the flight
• Update the firmware from transmitter and receiver to the latest version

Balance problems

Question: My Viper doesn't seem to be balanced. How can I correct that?

Solution: The focus is on good flight characteristics:

• The recommended focus is about 85-90mm behind the wing front edge
• Adjust the position of the flight battery to adjust the focus
• If necessary, small weights can be attached in the bow or rear
• Check the balance before any flight, especially after repairs

Chassis problems

Question: The retractor does not work reliably. How do I fix it?

Solution: problems with the chassis can have the following causes:

• Check the power supply and servo connections
• Make sure that the mechanism is free and not blocked by foreign bodies
• With heavy running gears, a drop of light machine oil can help
• In electrical problems, a chassis servo tester can be used for diagnosis

EDF performance problems

Question: My fan doesn't seem to have full performance. What can that be?

Solution: EDF performance problems can have various reasons:

• Check the battery for sufficient voltage and discharge rate
• Make sure the air inlet and outlet are not blocked
• Check if the impeller turns freely and is not impeded by foreign bodies
• Check the engine connections and ESC for correct cabling

SAFE Select activation problems

Question: How do I activate the SAFE Select function correctly?

Solution: The activation of SAFE Select takes place during the binding process:

• Follow the instructions for binding with activated SAFE Select
• Hold the binding button while you turn on the receiver
• After successful binding, assign a switch to the transmitter for SAFE activation
• Test the function before the flight by observing the control surfaces when moving the model

Conclusion: An outstanding EDF-Jet for various pilot claims

The E-flite Viper 90mm EDF Jet BNF Basic with AS3X and SAFE Select combines impressive performance data with good-natured flight characteristics. It offers both beginners to the jet world and experienced pilots an exceptional flight experience with a high fun factor.

The processing quality, advanced electronics and sophisticated design justify the price and make this model a worthwhile investment for ambitious model pilots. With a maximum speed of over 120 mph, impressive climbing performance and a turbine sound, this model delivers an authentic jet experience.

If you are looking for a powerful, well-processed and versatile EDF jet that is suitable for both the sports and the scale flight, you will find a worthy candidate in the Viper 90mm, who will set new standards in the class of large-format EDF jets.