S-EDF 90mm vs 105mm vs 120mm: Ultimate RC EDF Fan Comparison Guide 2026

S-EDF 90mm vs 105mm vs 120mm comparison

Comparing S-EDF 90mm, 105mm, and 120mm Ducted Fan Systems: Which One Fits Your RC Jet?

If you're deep into the world of RC jets and EDF (Electric Ducted Fan) systems, you've likely come across the S-EDF series. Today, we'll take a detailed look at three popular models—the S-EDF 90mm, 105mm, and 120mm—and compare their specifications, performance, and ideal use cases.

1. Overview & Key Specifications

Feature S-EDF 90mm S-EDF 105mm S-EDF 120mm
Motor Model 3560, 1550KV (External) 4270, 750KV (External) 5268, 640KV (Internal)
Total Weight ~320g 636g 858g
Blade Count 12 11 10
Blade Type Vortex Vortex Vortex
Plug Type Banana 4.0 Banana 6.0 Banana 6.0
Recommended Battery 6S, 5200mAh, 60C 6S×2, 5200mAh, 60C 6S×2, 5200mAh, 60C
Recommended ESC 100A 160A 160A

2. Motor Installation Parameters

Parameter 90mm 105mm 120mm
Motor Output Shaft 6mm 8mm 8mm
Motor Shaft Length 15mm 17mm 20mm
Mounting Hole Distance 25mm 25mm 30mm
Mounting Hole Diameter M4 M4 M4

3. Performance Testing (Push Balance)

Test Parameter 90mm 105mm 120mm
Test Battery 6S, 5200mAh, 60C 12S, 5200mAh, 60C 12S, 5200mAh, 60C
Test Current 95A 118A 120A
Max Thrust 3.7kg 7.4kg 8.6kg

🔹 S-EDF 90mm (12S Version)

  • Best For: High-performance 90mm jets where space is limited but power is critical.
  • Power Setup: 12S battery (dual 6S), delivering much higher voltage and efficiency.
  • Thrust: 5.0kg – a significant 35% increase over the 6S version.
  • Note: Higher voltage means higher efficiency (78A vs 95A for similar power class), but requires HV ESC and robust wiring.

4. Quick Comparison Table: S-EDF 90mm, 105mm, 120mm

Model Motor & KV Battery Max Thrust Weight Recommended ESC
S-EDF 90mm (6S) 3560, 1550KV 6S LiPo 3.7kg ~320g 100A
S-EDF 90mm (12S) 4250, 950KV 12S LiPo 5.0kg 400g 100–120A HV
S-EDF 105mm 4270, 750KV 12S LiPo 7.4kg 636g 160A
S-EDF 120mm 5268, 640KV 12S LiPo 8.6kg 858g 160A

5. Which One Should You Choose?

  • Choose the 90mm (6S) if you're building a lightweight jet and want a simple, affordable power system.
  • Choose the 90mm (12S) if you want max performance from a 90mm unit and are ready for a high-voltage setup.
  • Choose the 105mm if you need more thrust for a larger airframe but want to stay under 120mm size.
  • Choose the 120mm if you're building a large, heavy jet and need maximum thrust and presence.

Installation Tips for S-EDF Systems

All S-EDF models use M4 mounting holes, but shaft sizes and lengths vary:

  • 90mm: 6mm shaft, 15mm length
  • 105mm: 8mm shaft, 17mm length
  • 120mm: 8mm shaft, 20mm length

Always check your motor mount compatibility and use a high-quality ESC matched to the recommended current.

FAQ: S-EDF EDF Systems

  • 90mm (6S): 6S 5200mAh 60C
  • 90mm (12S): 12S 5000mAh
  • 105mm & 120mm: 12S 5200mAh 60C (dual 6S)

No, the 12S version is designed for high voltage. Use the correct battery to avoid damage.

The 90mm 12S version runs at 78A for 5kg thrust, offering excellent efficiency for its size.

If you need 8.6kg thrust for a large jet, yes. For smaller models, the 105mm may be a better fit.

Conclusion: Which S-EDF Should You Buy?

The S-EDF series offers a versatile range of EDF systems for RC jet enthusiasts. Whether you're building a lightweight sport jet or a large-scale turbine model, there's an S-EDF that fits your needs.