Flysky FGr4B vs FGr4D vs FGr4S vs FGr4 vs FGr4P: Complete Comparison & Buying Guide

Last Updated: July 2026 | Reading Time: 12 minutes | Difficulty: Beginner | Author: Dannyi Chen

Dannyi Chen — RC Enthusiast & Technical Writer at SoarSky. Specializing in RC receiver technology, surface RC setups, and product comparisons.

I. What Is the Flysky FGr4 Series?

The Flysky FGr4 series is a family of 4-channel AFHDS 3 Enhanced receivers designed specifically for RC cars and boats. All five models share the same core protocol (AFHDS 3) and are compatible with the same range of Flysky transmitters, but each has a unique design tailored to different use cases.

II. Side-by-Side Comparison: All 5 Receivers

III. FGr4B: The Lightweight Off-Road Champion

The FGr4B is just 6.4g and 17×29×16mm with an external single antenna. Supports PWM, PPM, i.BUS, and S.BUS outputs. Ideal for competition off-road racing and carbon fiber chassis.

Shop FGr4B — $35.99

IV. FGr4D: Dual Antenna Precision for On-Road

The FGr4D features dual built-in antennas and 4 Newport I/O ports for maximum flexibility. Best signal reliability in the FGr4 family. Supports i-BUS 2 for two-way telemetry.

Shop FGr4D — $37.99

V. FGr4S: Ultra-Compact for Mini Builds

The FGr4S V2 is the smallest and lightest at 5.1g with a built-in antenna and RSSI support. Perfect for 1/18, 1/24 mini cars and compact boat builds.

Shop FGr4S — $28.99

VI. FGr4: Horizontal Socket Space Saver

The FGr4 features a unique horizontal socket layout that saves vertical space. Widest voltage range (3.5-12V), longest range (>300m), and RSSI. Ideal for low-profile touring and drift cars.

Shop FGr4 — $29.99

VII. FGr4P: The Waterproof All-Rounder

The FGr4P offers PPX4 splash resistance, 150mm external antenna, RSSI, and 8g weight. Best for wet-weather bashing, RC boats, and crawlers.

Shop FGr4P — $28.99

VIII. Why Horizontal Sockets Matter (FGr4 Explained)

Most RC receivers use vertical pin headers. The FGr4's horizontal socket layout keeps plugs parallel to the PCB surface, saving vertical height and simplifying wire routing in low-profile vehicles like touring cars, drift cars, and 1/12 pan cars.

IX. Which FGr4 Should You Buy?

X. How to Install & Bind Any FGr4 Receiver

1. Mount the receiver — Use double-sided foam tape in a dry location. Keep antenna(s) at least 1cm from carbon fiber or metal.
2. Connect servos and ESC — Plug into CH1-CH4. Match polarity.
3. Enter bind mode on receiver — Hold BIND button while connecting power. LED flashes rapidly.
4. Enter bind mode on transmitter — System → RF → Bind. Select AFHDS 3 Enhanced mode.
5. Wait for connection — LED turns solid when binding succeeds.

XI. Compatible Transmitters

All five FGr4 receivers are compatible with any transmitter supporting AFHDS 3 Enhanced: Flysky Noble NB4/NB4+/NB4 Pro/NB4 Pro+/NB4 Lite, PL18/PL18 Ultra/PL18 EV, Paladin EV, and any AFHDS 3 RF module.

XII. What Real Users Say

• Mike R. (Mar 2025) — "FGr4B in my 1/10 2WD buggy. At 6.4g it's the lightest 4CH AFHDS 3 receiver I've found. Binding to my NB4+ was instant." ⭐⭐⭐⭐⭐
• Jason K. (Feb 2025) — "Switched to FGr4D for my touring car. Dual antennas make a difference — no more glitches at the far end of the parking lot." ⭐⭐⭐⭐⭐
• David L. (Apr 2025) — "FGr4S in my 1/24 Micro-T. Built-in antenna means no whip to break off when it rolls." ⭐⭐⭐⭐⭐
• Carlos M. (Jan 2025) — "FGr4's horizontal sockets are genius for my TT02. Everything lays flat and wiring is so much cleaner." ⭐⭐⭐⭐⭐
• Brian T. (Mar 2025) — "FGr4P survived an entire winter bashing season — snow, slush, salt. Never a single glitch." ⭐⭐⭐⭐
• Steve W. (Feb 2025) — "FGr4B in race buggy and FGr4P in basher truck. Both flawless for 6+ months." ⭐⭐⭐⭐⭐
• Andy P. (Apr 2025) — "FGr4 for my drift car specifically for the horizontal layout. Full signal across the entire gym during indoor sessions." ⭐⭐⭐⭐

XIII. Frequently Asked Questions

Q: What's the difference between FGr4B and FGr4P?

A: FGr4B is lighter (6.4g vs 8g) and smaller with standard vertical sockets. FGr4P is splash-resistant (PPX4), has a longer 150mm antenna, and supports RSSI. Choose FGr4B for racing weight savings; FGr4P for wet conditions.

Q: Can I use FGr4 receivers for boats?

A: Yes. All FGr4 models are rated for car/boat use. The FGr4P is best for boats due to PPX4 splash resistance. The FGr4S is also good for small boats due to its compact size and built-in antenna.

Q: Do all FGr4 models support telemetry?

A: FGr4S, FGr4, and FGr4P support RSSI. FGr4D supports i-BUS 2 for advanced two-way telemetry. FGr4B does not support telemetry.

Q: What's the actual range difference between single and dual antenna?

A: The dual-antenna FGr4D maintains stable signal at longer distances and through obstacles. All five receivers provide 200-300m+ range for typical RC car use. Dual antennas shine with carbon fiber chassis interference.

Q: Can I upgrade firmware on these receivers?

A: Yes. All five FGr4 receivers support online firmware updates via the Flysky update tool and a USB updater cable.

Q: Which FGr4 is best for a first-time buyer?

A: The FGr4P offers the best balance of features, durability (splash resistant), and price ($28.99). For mini cars, go with FGr4S. For touring/drift cars, the FGr4 is ideal due to its horizontal sockets.

Q: What's the advantage of the FGr4's horizontal sockets?

A: Horizontal sockets save vertical space, allow cleaner wire routing along the chassis, and make maintenance easier. Ideal for low-profile touring cars, drift cars, and builds where tidy wiring is a priority.

About SoarSky — A team of RC model and drone enthusiasts dedicated to providing premium transmitter accessories, FPV components, and RC hobby gear. Learn more at soarskyrc.com/pages/soarsky-about-us.

Copyright: This article is original content by SoarSky. Unauthorized reproduction is prohibited. | Disclosure: SoarSky is the seller of the products reviewed in this article. All opinions are based on hands-on testing and objective spec analysis. | Last Updated: July 2026