E-flite Apprentice STS 1.5m RTF Review: Why the AMA’s Official Trainer Dominates the Beginner Market

In the box: SAFE stabilization, a 59-inch club-size airframe, and a Spektrum radio. Not in the box: the flight battery and charger. Here’s the full picture before you buy.

The E-flite Apprentice STS 1.5m RTF is Horizon Hobby’s 59-inch electric trainer, pitched squarely at new pilots learning with an instructor at an RC flying field. Horizon’s product copy for the earlier EFL3700 package also bills the STS as the Official Trainer of the Academy of Model Aeronautics (AMA). Before it makes your shortlist of the best RC planes for learning, ask what it actually takes to get airborne. The answer starts with the box.

Quick Verdict

Bottom line: If you have an instructor, a large open field, and room in the budget for a flight pack and charger, the Apprentice STS RTF Basic is a sensible first trainer. Its three SAFE (Sensor Assisted Flight Envelope) modes give you a documented path from self-leveling basics to unrestricted flight on one airframe.

The qualifier up front: item EFL370001 is an RTF Basic. RTF means Ready-to-Fly, but this box doesn’t include the 3S LiPo (lithium-polymer) flight battery or a charger. The manual also recommends 1,300 ft. (400m) of clear space in all directions.

Look elsewhere if you fly only in tight spaces or want everything in one box. On October 8, 2026, Horizon and Tower Hobbies both listed EFL370001 on backorder with a December 2026 estimate, so confirm availability with your seller.

Best for: instructor-supported learners Main strength: documented, switchable training modes Main caveat: completion equipment and flying space

Read on for the shopping list, the setup, and how the STS stacks up against two HobbyZone stablemates.

Brief Overview

What It Is

The Apprentice STS is a high-wing electric trainer molded from EPO (expanded polyolefin) foam, riding on wide-stance tricycle gear with a steerable nose wheel. The EFL370001 package pairs the airplane and its installed electronics with a Spektrum DXS transmitter.

Who It’s Built For

Horizon aims the STS at first-time pilots training with an instructor, at instructors, and at club training programs, and rates it Skill Level 1. If you’re still comparing formats, see our guide to the best RC planes for beginners. Our advice: line up coaching and a flying site first.

Cool Features That Matter to a Beginner

• SAFE with three flight modes and panic recovery. Assistance shrinks as your skills grow.
• A complete Spektrum radio system. The Spektrum DXS is a seven-channel, full-range, Mode 2 DSMX 2.4GHz transmitter (throttle and rudder on the left stick), paired with an installed Spektrum 4650C receiver and 3230 flight controller.
• A documented upgrade path. Horizon supports the optional Spektrum GPS Module (SPMA3173), Landing Assist Sensor (LAS) Module (SPMA3180), and a float set.

AT A GLANCE Model: E-flite Apprentice STS 1.5m RTF Basic Smart Trainer with SAFE (EFL370001) Manufacturer: E-flite (Horizon Hobby) Wingspan: 59 in. (1,500mm) Length: 42.5 in. (1,080mm) Weight: 50 oz. (1,418g) without battery; 59 oz. (1,672g) with 3S 4000mAh pack Power system: E-flite BL15 840Kv motor, 30A telemetry ESC, 11 x 8 prop (installed) Servos: three 13g, one 37g (installed) Radio: Spektrum DXS (included) Power req’d: 3S 11.1V 3200–4000mAh LiPo, EC3 or IC3 (not included) Pilot skill level: Skill Level 1 (manufacturer rating) Price: Check current price

➤ Check current price and availability of the E-flite Apprentice STS 1.5m RTF on Amazon. Confirm the listing shows item EFL370001, and budget for a compatible 3S flight pack and charger.

Pros & Cons

WHAT WE LIKE

• Three SAFE modes plus panic recovery support step-by-step learning.
• Spektrum DXS transmitter included, AA cells and all.
• Motor, ESC (electronic speed controller), servos, receiver, and flight controller come installed.
• One added Spektrum receiver unlocks wireless instructor control.
• GPS, LAS, and float options extend the airplane’s useful life.

WHAT TO WATCH

• No flight battery or charger in the RTF Basic box.
• Horizon’s 1,300-ft. clear-space recommendation demands a big, open site.
• Instructor-link hardware is an extra purchase.
• Horizon and Tower Hobbies both listed a December 2026 backorder in early October 2026.

The Real Cost to Get Flying: What the RTF Basic Box Leaves Out

Can you fly it straight out of the box? Not with EFL370001. Horizon’s product page lists what you need:

1. A 3S 11.1V 3200–4000mAh LiPo with an EC3 or IC3 connector.
2. A compatible LiPo charger.
3. Transmitter batteries: already covered. The manual lists four AA alkaline cells in the box.

Horizon recommends the Spektrum Smart Powerstage Air Bundle (SPMXPSA300): a 4000mAh 3S G2 Smart battery plus the S120 charger. As of October 8, 2026, though, Spektrum’s own page lists that bundle as no longer available, so plan on buying a compatible pack and charger separately. Watch one more trap. The S120 USB-C Smart Charger (SPMXC1020) charges Smart batteries only, and its USB power supply is sold separately.

Which box should you buy? Compare item codes, not titles:

⚠ LiPo safety: Charge under supervision, away from anything combustible, with compatible equipment. Never charge a damaged pack, never leave a charging pack unattended, and stop at once if a pack gets hot or starts to swell, as the S120 manual directs. G2 auto-balancing doesn’t change those rules.

Expected Experience with the E-flite Apprentice STS 1.5m RTF

Unboxing to Airframe: Assembly Complexity

The manual’s assembly list is short: install the landing gear and tail, connect the linkages and ailerons, and attach the wing with six rubber bands; the assembly section has no separate prop-installation step. The manual lists PH#0 and PH#1 screwdrivers, so the no-glue, no-special-tools line on Horizon’s older STS page means no specialty tools, not no tools at all.

The current manual sets the center of gravity (CG) at 3.15 in. (80mm) behind the wing’s leading edge at the root, within a range of roughly 2.76–3.54 in. (70–90mm). The 2019 manual for the earlier EFL3700/EFL3750 lists 3.125 in. (79mm). Follow the manual that ships with your airplane, and balance with the pack you’ll fly.

No published, fully documented test times the EFL370001 build as of October 2026. To see the process first, BrianPhillipsRC’s June 2024 YouTube video, E-flite – Apprentice STS – 1.5m – Unbox, Build, & Radio Setup, covers it on camera.

Radio Setup and Binding: Spektrum DXS and SAFE Modes

Switch B on the DXS selects the flight mode; button A triggers panic recovery. Per the manual:

• Beginner limits pitch and bank and self-levels when you center the sticks.
• Intermediate loosens the limits and doesn’t self-level, though the manual says it reverts to Beginner below 100 ft.
• Experienced drops both.

The STS also carries AS3X (Artificial Stabilization – 3-aXis), which isn’t the same as self-leveling.

The DXS manual describes wireless instructor operation through a separate Spektrum SRXL2 DSMX Remote Receiver (SPM9747); talk to your instructor before buying one. The DXS has no screen and no general programmability, though it shows flight-battery status by LED with compatible Smart gear. Before flying, run the manual’s initialization, control-direction, and range checks, with throttle cut active.

In the Air: Takeoff, Flight Behavior, and Landings

Horizon says the STS flies loops, rolls, and inverted in Experienced mode, a manufacturer claim. As of October 2026, no published, fully documented flight test of EFL370001 reports measured flight time, stall speed, takeoff or landing distance, or wind handling. For a look without the training wheels, Fat Guy Flies RC’s June 2023 video, Another Review of the E-flite Apprentice STS by Fat Guy Flies RC, is described by its creator as demonstrating expert-level flight without self-leveling.

Panic recovery doesn’t steer around obstacles and needs enough altitude to work. Optional SAFE Plus and LAS are documented as compatible, but no published test shows how much they improve landings here.

💡 Tip: Start with an instructor or club, the setting Horizon positions the STS for. Let your instructor decide when you change modes; no fixed number of flights applies.

Build Quality and Durability in Real Ownership

Repairs get more concrete with a dedicated Apprentice STS wing set (EFL310013), which Horizon listed in stock on October 8, 2026.

The current manual and EFL370001 page agree on three 13g servos, one 37g servo, and a 4650C receiver, while the 2019 manual for earlier packages lists a different servo mix. That paperwork gap doesn’t by itself prove a redesign.

As of October 2026, no published record documents the STS’s long-term crash tolerance, failure rates, or Horizon’s repair turnaround. Inspect the airplane after any hard landing.

How It Stacks Up: Value vs. the Competition

The STS wins on role, as the largest of the three and Horizon’s club-training pick, but loses on box completeness. The Apprentice STOL S (short takeoff and landing) ships with its own battery and charger, while the Carbon Cub S 2 Basic carries the same shopping list as the STS.

No published head-to-head flight or cost-per-flight comparison of these three exists as of October 2026. We’d compare complete system cost at your seller, the space you fly in, and gear you already own. A smaller airplane isn’t automatically legal or suitable for any backyard or park.

Where the E-flite Apprentice STS 1.5m RTF Really Shines

The STS’s strongest case is technical, and it’s a good one. Three documented SAFE modes let you learn on a single airplane, starting with attitude limits and self-leveling and ending with both switched off. With an instructor, that progression can build a beginner’s confidence without swapping airframes or radios.

It also fits the club setting it was built for. Horizon aims it at instructors and training programs, and the DXS supports a wireless instructor link with one added receiver.

Life after solo has options. The manual identifies an optional float set for water flying once you’re comfortable in Experienced mode, and Horizon lists the E-flite Float Set with Brackets: 15-Size (EFLA550); its page still uses Apprentice S 15e naming, so confirm fit. GPS and LAS modules wait in the wings. None of it guarantees a faster solo, but it keeps the airplane useful.

E-flite Apprentice STS 1.5m RTF

• Three SAFE flight modes with panic recovery
• Spektrum DXS transmitter included
• Motor, ESC, servos, receiver, and flight controller installed
• Optional GPS, LAS, and float accessories

Check current package and availability on Amazon Battery & charger sold separately. Confirm item number EFL370001.

Who Should Buy It (and Who Should Skip It)

Buy it if you are:

• The club-bound beginner with an instructor, a full-size field, and budget for a 3S pack and charger.
• An instructor or club training program wanting a stabilized trainer, Horizon’s stated audience.
• The long-haul learner who wants one airplane and radio from Beginner mode to the Experienced mode Horizon says handles loops and rolls.

Skip it, or pick another package, if you:

• Fly only in a small space. Compare the HobbyZone Apprentice STOL S (HBZ6100), which Horizon listed on backorder with a January 2027 estimate on Oct. 8, 2026, after checking your site’s legal and physical limits.
• Want everything in one box. The STOL S includes battery and charger; the full EFL37000 RTF is discontinued.
• Already own a full-range Spektrum transmitter. Look at the BNF Basic (EFL3750).
• Want a scale or sport plane first. The STS is a trainer by design.

FAQ

Q: Is the E-flite Apprentice STS 1.5m RTF a good first RC plane for a complete beginner with no flying experience?

A: The E-flite Apprentice STS RTF Basic is a good first trainer for a beginner who has an instructor and suitable flying space.

• Three SAFE modes and panic recovery support step-by-step learning.
• No trainer guarantees an unassisted first flight.

Q: What exactly do I need to buy besides the E-flite Apprentice STS 1.5m RTF before my first flight?

A: The E-flite Apprentice STS RTF Basic (EFL370001) needs a flight battery and a compatible charger.

1. A 3S 11.1V 3200–4000mAh LiPo with an EC3 or IC3 connector.
2. A matching charger; the S120 takes Smart packs only and needs a separate USB power supply.
3. No AA cells; four come in the box.

Q: What is the difference between the Apprentice STS RTF Basic, the full RTF, and the BNF Basic version, and which one should I buy?

A: The Apprentice STS packages differ in included equipment, so choose by item code.

• RTF Basic (EFL370001): DXS included; battery and charger separate.
• Full RTF (EFL37000): everything included, but listed as discontinued.
• BNF Basic (EFL3750): bring your own transmitter, battery, and charger.

Q: How do the SAFE flight modes on the Apprentice STS work, and when should I switch from Beginner to Intermediate or Experienced mode?

A: The Apprentice STS selects three SAFE modes with switch B on the DXS, and your instructor should set the switching timetable.

• Beginner: attitude limits plus self-leveling.
• Intermediate: looser limits, no self-leveling; Beginner below 100 ft.
• Experienced:
• Button A triggers panic recovery, which needs altitude and doesn’t avoid obstacles.

Q: How long can I fly the E-flite Apprentice STS 1.5m on one battery, and how many batteries should I bring to the field?

A: No published, fully documented test reports a measured flight time for the E-flite Apprentice STS 1.5m RTF Basic as of October 2026.

• Set flight lengths and pack count with your instructor, based on your charger and session length.

Q: Can I fly the E-flite Apprentice STS 1.5m in a regular park, or do I need an RC club field?

A: A park works for the E-flite Apprentice STS 1.5m only if it meets both the space recommendation and legal requirements.

• Horizon recommends 1,300 ft. (400m) of clear space in all directions, not just a runway that long.
• FAA recreational rules require passing The Recreational UAS Safety Test (TRUST) and carrying proof, keeping visual line of sight, yielding to other aircraft, and following community safety guidelines. Stay at or below 400 ft. in uncontrolled Class G airspace; controlled airspace requires prior authorization.
• The STS’s flying weight exceeds the 0.55-lb. (250g) exception, so you must register it with the FAA, mark it, and carry proof.
• Registered aircraft must meet Remote ID rules unless flown within an FAA-Recognized Identification Area (FRIA). A club field isn’t automatically a FRIA.