E-flite Apprentice STS 1.5m RTF Review: What the Evidence Really Shows

RTF doesn’t mean everything’s in the box. The Apprentice STS brings SAFE modes and a 59-inch airframe, but the flight pack, charger, and field space are on you. Read this before you buy.

Quick Verdict

Our E-flite Apprentice STS 1.5m RTF review lands on a qualified yes. We’d point a first-time pilot toward this trainer if you have an instructor, a large legal flying site, and room in the budget for a flight pack and charger. Three SAFE modes on a 59-in. airframe let you work from assisted flight toward manual control with one airplane and one radio.

Skip it if you fly from a small site or expect a complete box. Despite the name, this package (item EFL370001) ships without a flight battery or charger.

Horizon Hobby’s manual documents the hardware and procedures in detail, but no published test of this exact package names its pilot, setup, and conditions, so this verdict rests on documentation rather than flight data.

Still weighing other airplanes? Our guide to the best RC planes makes a good cross-check. If this one’s on your shortlist, the real-cost math and rival comparison below are where the decision gets made.

Brief Overview

What It Is

The Apprentice STS is a high-wing electric trainer molded in EPO (expanded polyolefin) foam, with tricycle gear and a steerable nose wheel. Horizon’s listing sells it as an RTF Basic package. RTF normally means airframe, radio, battery, and charger. This one stops at the radio.

Horizon traces the design to the Apprentice S 15e. Chad Budreau, in a Model Aviation flight review of that older airplane’s DX5e package, describes repeated landing approaches while learning and an eventual shift to less assisted modes. That’s useful history, but no published comparison flight ties it to the STS.

Who It’s Built For

Horizon rates it Skill Level 1 and markets it as a club trainer for beginners and instructors. The manual sets a minimum recommended age of 14, calls for direct adult supervision of children, and recommends a qualified instructor for first RC flights. Comparing first airplanes? See our roundup of the best RC planes for beginners.

Cool Features

• SAFE modes and panic recovery: Sensor Assisted Flight Envelope gives you Beginner, Intermediate, and Experienced modes on Switch B, with panic recovery on Button A.
• Included Spektrum DXS: The 2.4 GHz DSMX transmitter arrives bound to the airplane.
• Room to expand: The separately sold GPS module (SPMA3173) adds SAFE Plus Holding Pattern, AutoLand, and Virtual Fence, and it reassigns Button A to Holding Pattern and AutoLand. The Landing Assist Sensor (LAS, SPMA3180) and EFLA550 float set are also separate options.

AT A GLANCE

Ready to price it? Check current price on Amazon, confirm item EFL370001, and budget for a 3S pack and charger.

Pros & Cons

What We Like

• Three SAFE modes and panic recovery support a gradual step from assisted flight to manual control.
• The 59-in. span is the largest of the four trainers compared here.
• Motor, ESC, servos, receiver, and flight controller come factory-installed.
• The DXS can act as a wireless instructor radio with a compatible student radio.

What to Watch

• No flight battery or charger comes in the box, despite the RTF name.
• The manual calls for at least 1,300 ft. (400 m) of clear space in all directions.
• Wireless training requires a separately sold SPM9747 remote receiver.
• The underside battery hatch and six-band wing mount add steps to your field routine.

Is It Worth the Money? Real Cost and Rival Trainers

The value question turns on what you already own. Starting from zero, the box price is only the first line of the budget. We’d call the included radio and staged SAFE path worth paying for only if you can actually use them at a suitable site with an instructor. Add spares, optional club costs, and any Remote ID equipment when you compare totals.

What You’ll Still Need to Buy

1. Flight pack: a 3S (11.1-volt) 3200–4000mAh LiPo with an EC3 or IC3 connector.
2. Charger: one that supports your pack’s chemistry, cell count, and connection, plus any power supply it needs. Horizon recommends the Spektrum Smart Powerstage Air Bundle (SPMXPSA300), which pairs a Smart G2 3S 4000mAh 30C pack with the S120 USB-C charger. Spektrum’s page has shown that bundle as no longer available, so check stock. The S120 needs a separate USB power supply and charges only Spektrum Smart batteries, so a non-Smart pack won’t work with it.
3. Field spares (optional): a second compatible pack and a stock EFLP11080E prop.

The four included AA cells power the transmitter, not the airplane. Stock moves, too: Horizon’s own listing has shown this package on backorder, so confirm availability before you plan a first flight.

Read the item number before you click, because it decides what arrives:

• EFL370001 RTF Basic: DXS included; pack and charger separate.
• EFL3750 BNF Basic: Needs a full-range, six-or-more-channel Spektrum DSMX/DSM2 transmitter, plus a pack and charger.
• EFL37000 and EFL3700 full RTF: Discontinued packages with a Smart 3S 3200mAh pack and S120 charger, plus a DXS and DXe transmitter, respectively.

LiPo safety: Use a charger approved for your pack. Never leave a charging pack unattended or charge it overnight. Remove it from the airplane and charge it in a fireproof or fire-retardant container, such as a LiPo bag, away from flammable materials. Stop using any damaged or swollen pack.

How It Stacks Up

We’d choose the Apprentice STS for its documented club-training workflow and the smaller Apprentice only if a local seller and your site make it practical. Take the Carbon Cub if scale looks matter most. Pick the FMS when one complete electronics bundle is the priority, and match the exact RTF configuration at checkout.

No head-to-head flight test of these four has been published.

Expected Experience with E-flite Apprentice STS 1.5m RTF

Assembly and Balancing

Expect light mechanical work followed by checks that really matter. With PH#0 and PH#1 Phillips drivers, you’ll fit the nose and main gear, secure the tail with two 2.5 x 15mm screws, join the wing halves on the carbon tube, connect the aileron linkages, and strap the wing on with six rubber bands. Horizon says the band mount lets the wing move or separate on impact, and it recommends against adding more than six.

A catalog listing estimates less than one hour, but no independent timed build or factory-fit sample has been published.

Balance the airplane with the pack you’ll actually fly. The manual’s CG target is 80mm (about 3.1 in.) aft of the leading edge at the wing root, within a 70–90mm (about 2.8–3.5 in.) range, and Horizon cautions against flying outside it. Secure the pack before flight.

Radio and SAFE Setup

Learn four controls first:

• Switch B: flight mode
• Button A: bind and panic
• Switch F: high and low rates (100 and 70 percent travel)
• Switch H: throttle cut

The DXS reports flight-pack voltage through four LEDs and a low-voltage audible alert. Treat them as voltage indications that change under load, not a precise remaining-time gauge.

The manual then requires a control-direction test and a range test, and it adds a SAFE control-direction test if you install the GPS upgrade. Hold the airframe motionless during initialization. No independent range result has been published.

Ground-test safety: Run the control-direction test in Experienced mode with throttle cut engaged. For any test that needs throttle, follow the manual’s specific procedure and keep clear of the propeller.

In the Air

Beginner limits pitch and roll and self-levels when you center the sticks. Intermediate widens those limits, drops self-leveling, and reverts to Beginner automatically below 100 ft. Experienced removes the limits and self-leveling, and AS3X (Active Stabilization, 3-Axis) activates once throttle passes 25 percent.

Horizon starts first flights in Beginner, with takeoff into the wind and small inputs. Its instructor section suggests Switch B position 1 for teaching, so settle the plan with your instructor. The manual sets no fixed number of flights before you move up.

Handling is where the record runs out. No version-matched report documents typical endurance, power margin, gust or crosswind behavior, or recovery height.

For flight time, Horizon specifies a five-minute timer for first flights, then adjustment for your pack. Its 4–6-minute checklist figure applies to a 3S 3000mAh example, smaller than the current recommendation. Horizon’s retail copy promises “longer flight times up to 20–30+ minutes” on a 3S 4000mAh pack, a claim our research couldn’t confirm independently.

Land immediately if the ESC’s low-voltage cutoff pulses the motor; that’s a backstop, not a fuel gauge. Panic recovery has limits too. It needs altitude, especially from inverted flight, and it can’t avoid obstacles.

Durability and Repairs

Plan on repairs as a normal ownership cost. No failure-rate, parts lead-time, or long-term service data has been published for this package.

The manual does give you a usable parts map, including the prop (EFLP11080E), spinner (EFL2733), motor mount (EFL2734), nose gear (EFL310006), firewall (EFL310008), wheels (EFL310011), and cowl (EFL310018). Horizon says wing and fuselage repairs can use virtually any adhesive, including hot glue, regular CA, or epoxy. Repeat your setup checks after any repair.

Horizon’s limited warranty covers defects in materials and workmanship, not crash damage. Its recall index showed no recall specific to EFL370001.

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

This airplane’s best argument is continuity. The same airframe and radio can carry you from self-leveling first flights to a mode with no attitude limits, so your confidence can build as the assistance comes off. Instructors get a matching tool: selectable modes, plus wireless training with the extra receiver.

The AMA’s Introductory Pilot Program describes direct supervision by a club-designated instructor. Robert Carter, a self-identified club Intro Pilot Instructor and volunteer Horizon Hobby Flight School instructor, describes a separate route, Horizon’s instructor referral: “HH finds a volunteer instructor like me near their zip code.” His account illustrates the referral process; it isn’t a flight test of this airplane or a promise of current enrollment.

Horizon’s legacy EFL3700 listing and retail copy for EFL370001 use the phrase “Official Trainer of the Academy of Model Aeronautics (AMA).” We couldn’t confirm that designation with the AMA.

E-flite Apprentice STS 1.5m RTF Basic (EFL370001)

• 59-in. high-wing trainer
• Spektrum DXS transmitter included
• Three SAFE flight modes
• Panic Recovery on Button A

View on Amazon

Battery and charger sold separately. Confirm item EFL370001.

Who Should Buy It

Buy it if you’re:

• A club-bound beginner with instructor access and a site that fits
• An instructor or training program that wants selectable assistance on a large trainer
• A learner who wants one airplane through all three modes

Skip it if you:

• Have only a small site
• Want everything in one box (look at the FMS RTF selection)
• Already own a compatible full-range Spektrum transmitter (compare BNF Basic EFL3750)
• Have no instructor access and little patience for repairs

FAQ

Q: Is the E-flite Apprentice STS 1.5m RTF a good first RC plane for a complete beginner?

A: The Apprentice STS is a qualified first-plane choice for a beginner with an instructor, adequate space, and a compatible flight power setup.

• Horizon rates it Skill Level 1 and recommends a qualified instructor for first flights.
• No published data shows beginner success rates.

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

A: The Apprentice STS EFL370001 requires a compatible 3S LiPo flight pack and charger.

• Choose a 3S 3200–4000mAh pack with EC3 or IC3.
• Confirm charger compatibility and any power supply it needs.

Q: What is the difference between the RTF Basic and BNF Basic versions of the Apprentice STS?

A: The EFL370001 RTF Basic includes the DXS transmitter, while the EFL3750 BNF Basic requires a compatible transmitter you supply.

• BNF Basic buyers must bind the radio and program the SAFE and panic channels per the manual.

Q: How do the SAFE flight modes work, and when should I switch modes?

A: Start the Apprentice STS in Beginner mode and progress with an instructor as your skills develop.

• Beginner limits attitude and self-levels.
• Intermediate allows more freedom and reverts to Beginner below 100 ft.
• Experienced removes attitude limits and self-leveling.
• No fixed flight count applies; move up when you and your instructor judge you’re ready.

Q: How long can I fly the Apprentice STS on one battery?

A: Horizon specifies a five-minute first-flight timer for the Apprentice STS.

• Adjust later flights to your actual pack, per the manual.
• Horizon’s retail copy claims up to 20–30+ minutes on a 3S 4000mAh pack; don’t use that as your timer setting.
• No independent runtime on 3200–4000mAh packs has been published.

Q: Can I fly the Apprentice STS in a park, or do I need an RC club field?

A: A suitable club field is the practical first choice for the Apprentice STS, given Horizon’s clearance guidance and instructor recommendation.

• Check for 1,300 ft. of clear space in all directions, clear of people and pets.
• Confirm site permission and airspace. Under the FAA’s recreational rules, follow an FAA-recognized community-based organization’s safety guidelines, fly within visual line of sight, give way to other aircraft, stay at or below 400 ft. in Class G airspace, and get authorization for applicable controlled airspace.
• Register and mark the airplane, then carry proof of registration and your TRUST (The Recreational UAS Safety Test) completion.
• Sort out Remote ID: use Standard Remote ID, a compliant broadcast module, or an FAA-Recognized Identification Area (FRIA). Stock Remote ID capability is unconfirmed, and the optional GPS doesn’t establish compliance.