The ultimate guide to the E-flite Viper 70mm EDF Jet BNF Basic

There are few models in the world of radio remote-controlled flight models that can delight both beginners and experienced pilots alike. The E-flite Viper 70mm EDF Jet BNF Basic with AS3X and SAFE Select Technology (EFL077500) is one of these special models that offers the perfect balance between impressive performance and surprising usability. This comprehensive guide will provide you with all the important information you need for a sound purchasing decision.

Technical specifications and performance data

The heart of this beam model is its powerful drive system that provides impressive speeds and vertical gradients. The updated version of the Viper model scores with an improved drive system, smart electronics, shock-absorbing struts and softer tires.

Technical data at a glance

The model comes with a range of AR631 receivers equipped with fly-by-range telemetry and DSMX technology. The eight digitally controlled servos with metal transmissions provide precise control while the connections with ball joints ensure accurate control.

Target group and accessibility

The E-flite Viper has been specially designed to close the gap between simple sports aircraft and more demanding jet models. It is aimed at:

• Advanced Beginnerswho want to venture their first step into the EDF jet world
• Experienced pilotsSeeking a versatile and powerful jet model
• Sports trailerswho want to expand their repertoire

What distinguishes this model is its ability to fly like a sports aircraft, but at the same time provide the aesthetics and performance of a jet jet. It is the ideal choice for pilots looking for their first "complete" and powerful jet jet.

The optionally switchable SAFE Select technology offers airfield protection, which is particularly valuable for beginners as it significantly reduces the risk of crashes during the learning phase.

Flight performance and flight characteristics

Speed and maneuverability

The E-flite Viper 70mm EDF Jet is characterized by an exceptionally wide power range. With its 12-leaf emitter, the powerful 1900Kv Brushless motor and the 85-ampere controller, it can reach speeds of over 190 km/h when using a 6S LiPo battery.

The aerodynamic shape and the stable construction allow:

• Impressive vertical performance
• Precise aerobatic maneuver
• Stable flight properties at low speeds
• Predictable behaviour in curves

Increased power

The climbing performance of the Viper is remarkable, especially considering that it is an entry-level model in the jet area. With full thrust, the model can climb almost vertically and offers opportunities for spectacular flight maneuvers that are usually more advanced models.

Flight time

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

• With aggressive flight style with frequent full gas phases: about 4-5 minutes
• With moderate flight style with a mixture of high and low speed phases: 6-7 minutes
• With economic flight style with predominantly travel speed: up to 8-9 minutes

The recommended 6S 3200-4000mAh LiPo batteries offer a good balance between performance and flight time.

Material quality and construction

The E-flite Viper 70mm is made of high-quality EPO foam, which is both lightweight and resistant. The design is designed for longevity.

Special design features:

• Partial support surface: Simplifies assembly and increases structural stability
• Screw-in stabilizers: No glue required, which facilitates repairs
• Electric retractors: factory installed and robustly constructed
• Functional flaps: Extend the flight area and facilitate landing
• Shock-damping suspension legs: Reduce the load on landings on uneven surfaces
• Large battery access installed above: Simplifies quick battery change in the field

The updated version of the model features smart electronics, improved shock-absorbing struts and softer tires that increase operational safety and comfort.

Construction and preparation

One of the great advantages of the E-flite Viper 70mm EDF Jet is its fast and uncomplicated assembly. Most components are already installed so that only a few steps are required to make the model ready for flight.

Working time and steps:

1. Mounting of the height control units with the included screws (approx. 5 minutes)
2. Attachment of the side guide with three countersunk screws (M3 x 16 mm) (approx. 3 minutes)
3. Mounting the support surface and securing with the corresponding screws (approx. 5 minutes)
4. Configuration of the receiver and binding to the transmitter (approx. 10 minutes)
5. Programming of the optional SAFE Select functions as required (approx. 5 minutes)

Overall, an experienced model maker can have the Viper ready for flight in about 30 minutes. Even for newcomers in the RC sector, assembly should be completed in less than one hour.

Quality of instruction

The included multilingual guide is detailed and clearly structured. It contains:

• Detailed step-by-step instructions with illustrations
• Tips for focusing
• Manual for programming the SAFE Select functions
• Recommendations for the first flights
• Maintenance instructions

The detailed explanations of AS3X and SAFE technology are particularly helpful, which offer significant added value for beginners.

Transportability and Storage

The E-flite Viper 70mm EDF Jet can be transported relatively easily, although it is not one of the most compact models with a span of 1.1 meters.

Transport properties:

• The one-piece support surface cannot be removed, which requires a larger transport container
• The height control units can be disassembled for transport
• A special transport case or bag is recommended to avoid damage
• The model fits in most medium to large cars when the rear seats are folded over

For regular transports it is recommended to invest in a tailor-made transport bag or box that can accommodate both the model and accessories such as batteries, charger and tool.

AS3X and SAFE Select Technology

An outstanding feature of the Horizon Hobby Viper model is the integrated stabilization technology that offers benefits both for beginners and experienced pilots.

AS3X (Aircraft Stabilization System - 3-Axis)

This technology works in the background and ensures:

• Reduction of wind and turbulence
• Precise flight behaviour
• Glattere trajectory
• Improved control in aerobatic maneuver

The Viper acts like a much larger model by AS3X even in windy conditions and reacts precisely to control commands.

SAFE Select (Sensor Assisted Flight Envelope)

This optional feature provides additional security and can be switched on or off:

• Automatic self-leveling when releasing the control billets
• Angle and speed limitation
• Easy start and landing
• panic recovery mode for disorientation

SAFE technology is particularly valuable for pilots who fly their first jet, as it significantly reduces the risk of crashing and at the same time accelerates the learning process.

Spare parts supply and support

As a product of Horizon Hobby, the E-flite Viper 70mm EDF Jet enjoys an excellent spare parts supply and support structure.

spare part availability:

• Extensive spare parts assortment about the Horizon Hobby Webshop
• Long wear parts such as chassis, impellers and servos are readily available
• Special parts can usually be delivered within a few days
• Many standard components are compatible with other E-flite models

Community support:

Another advantage of this popular model is the active community of Viper pilots that can be found in forums, social media and local flight groups. This community offers:

• Exchange tips and tricks
• Aid for technical problems
• Modification ideas and instructions
• Flight videos and inspirations for your own flights

Especially for beginners, this community support is invaluable as it significantly facilitates entry into the world of the EDF jets.

Reviews and customer experience

Customer reviews for the beam model of E-flite are mostly positive, with some recurring themes that appear in most reviews.

Positive aspects in customer reviews:

• Impressive flying characteristics that appeal to both beginners and experienced pilots
• Excellent balance between stability and agility
• High-quality processing and robust construction
• Effective AS3X and SAFE technology that facilitates flying
• Impressive speed and vertical power
• Attractive appearance with clean lines and striking color
• Reliable electronic components

Critical points in customer reviews:

• Relatively short flight time with aggressive flight style
• Higher purchase price compared to simpler sports models
• Limited transport capacity due to the non-removable supporting surface
• Occasional problems with the retraction suspensions in landings on uneven surfaces

The improved version with the updated drive system and the reinforced suspension struts has already addressed many of the earlier criticism points.

Comparison with alternative products

To make a sound purchase decision, it is helpful to compare the E-flite Viper 70mm with similar models.

FMS Avanti S 80mm EDF Jet

Advantages over the Viper:

• Larger 80mm Impeller with more thrust
• Removable guide and support surfaces for easier transport
• slightly higher maximum speed

Disadvantages over the Viper:

• Less advanced stabilization system
• A little harder to fly for beginners
• Higher weight and thus higher landing speed

Freewing F-16 70mm EDF Jet

Advantages over the Viper:

• More true to scale appearance
• Comparable performance
• Often cheaper in price

Disadvantages over the Viper:

• More unstable flight behaviour without advanced stabilization technology
• More difficult landings due to the configuration as a model jet
• Less beginner-friendly

E-flie F-16 Thunderbird 70mm EDF

Advantages over the Viper:

• Spectacular appearance of a famous military jet
• Similar electronics and stabilization systems
• Comparable flight performance

Disadvantages over the Viper:

• Less stable flight properties at low speeds
• Higher landing speed required
• Less suitable for first jet experiences

Compared to these alternatives, the E-flite Viper 70mm EDF Jet BNF Basic is characterized by its beginner friendliness and impressive performance. It offers the best balance between accessibility and high-performance experience.

Value for money

The Horizon Hobby Viper 70mm EDF Jet is located in the middle to top segment. However, the price-performance ratio can be rated as good to very good for the equipment and performance offered.

Price consideration:

• Higher purchase price as simple sports models
• Competitive compared to other 70mm EDF-Jets
• Includes high-quality components such as digital metal transmission servos and spectrum receivers
• Durable construction that minimizes repair costs

The overall value of the model is increased by integrated AS3X and SAFE technology, which would often have to be retrofitted in comparable models without these functions.

Tips, tricks and optimizations

Optimum settings and preparation

1. Priority: The focus should be set exactly according to instructions. Even slight deviations can significantly influence the flight behavior.

2. Rudder:

   • For beginners: Reduced outputs with 30% Expo setting
   • For Advanced: Intermediate Outings with 25% Expo
   • For experts: High outputs with 20% Expo for maximum agility

3. Battery selection and management:

   • For maximum performance: 6S 4000mAh 30C+ LiPo
   • For optimal balance between performance and flight time: 6S 3600mAh 30C+
   • Always bring batteries to room temperature before flight
   • Accurate focus precisely

4. Start- und Landetechnik:

   • Starts: Full flaps for short starting distance, half flaps for more controlled start
   • landings: approach with half flaps, full flaps only in the final approach
   • landing approach with slightly increased speed for better control
   • Use of the optional thrust reversal for shorter rolling distance

Performance optimizations

1. Drive tuning:

   • Upgrade to higher quality cables and plugs for improved current flow
   • Optimization of engine cooling by additional air inlets
   • Precise alignment of the impeller for maximum efficiency

2. Aerodynamic improvements:

   • Sealing columns and openings with clear adhesive tape
   • Ensure that all rows work without play and precise
   • Regular checking and correction of distortions in the foam material

3. Electronic optimizations:

   • Calibration of the servos for exact neutral position
   • Fine tuning of the AS3X parameters for personal flight style preferences
   • Adjustment of flap speed for more realistic behavior

Frequent questions and problems

Technical questions

Question: How long does the battery last in normal flight conditions?

Answer: With a 6S 3600mAh LiPo battery, you can expect about 6-7 minutes flight time with mixed flight style. Constant flying with full gas reduces flight time to about 4-5 minutes, while a modest flight style can allow up to 8-9 minutes at a moderate speed.

Question: Is the Viper suitable for beginners who have never flew a jet?

Answer: Yes, but with limitations. The E-flite Viper with its SAFE Select technology is one of the most affordable jets on the market. Nevertheless, absolute beginners should first gain experiences with simpler models before going to this jet. However, pilots with basic experience can safely enter the jet world using SAFE technology.

Question: Can I start the Viper from grass pistes?

Answer: Yes, but only on very short and well maintained grass. The relatively small wheels of the model are better suited for hard surfaces. On longer grass surfaces, the start is made considerably more difficult and can lead to damage to the chassis.

Electronic and Compatibility Problems

Question: Is the model compatible with my existing spectrum DX8?

Answer: Yes, the E-flite Viper can be used with all spectrum DSMX/DSM2 compatible transmitters with at least 6 channels. The DX8 is excellently suited and offers additional programming options for advanced settings.

Question: Can I use batteries other than recommended?

Answer: Technically, you can use any 6S LiPo battery that fits into the battery compartment and can supply sufficient power (at least 30C). However, make sure that the focus is set correctly, as batteries with different dimensions can move them.

Question: What do binding problems between transmitter and receiver?

Answer: Make sure your transmitter is updated to the latest firmware. Follow the binding procedure exactly by instructions. In case of persistent problems, a reset of the receiver can help or the use of a binding plug that is supplied to many spectrum receivers.

Flight problems and solutions

Question: My model tends to move to the left. How can I fix that?

Answer: This could have several causes:

1. Check the trimming of the side rudder and the cross rudder
2. Make sure that the thrust of the impeller is straight
3. Check if the surface is covered
4. Recalibrate AS3X sensors by placing the receiver on a flat surface

Question: The landings are often too hard and damage the suspension. What can I do?

Answer: Try the following approaches:

1. Practice longer, flatter approaches with constant sink rate
2. Use the flaps earlier to reduce the approach speed
3. Keep a slightly increased speed until just before putting on
4. Consider the installation of reinforced suspension struts or shock absorbers
5. Use the push reversal function to shorten the rollout distance

Question: How can I extend the flight time?

Answer: Here are some strategies:

1. Use a higher-capacitive battery (up to 4000mAh if the focus is correct)
2. Reduce solid gas phases and fly more efficient maneuver
3. Use thermal winding if possible
4. Optimize aerodynamics by sealing columns
5. Make sure the Impeller is optimally aligned

Conclusion

The E-flite Viper 70mm EDF Jet BNF Basic with AS3X and SAFE Select represents an impressive combination of performance and accessibility in the field of EDF jets. With its updated drive unit, improved chassis components and intelligent electronics, it offers both beginners and experienced pilots an exceptional flight experience.

The strengths of this model are clearly in its versatility, high speed of over 190 km/h and advanced stabilization technology, which ensures safety and control even in demanding flight conditions. The relatively simple assembly and the good spare parts supply are further advantages.

Of course, there are also compromises, such as the limited flight time and the limited transport capacity due to the non-removable carrying surface. However, these disadvantages are more than compensated by the excellent flight properties and the robust construction.

For pilots looking for their first jet experience or experienced pilots looking for a reliable and powerful model for everyday flight operations, the state-of-the-art Viper from Horizon Hobby is an excellent choice that offers excellent value for money.