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Quantity (10)

Availability 10 in stock
Weight 1.50 lbs
SKU MTR-0150
Manufacturer Scorpion

This motor is perfect for any 30-40cc airframes, or aerobatic airplanes with Wingspan of 73-78" running on 10s batteries.

Recommended set up - 
ESC - Tribunus 12-130A SBEC ESC
Batteries - 10s 4000-5000mah
Prop - 21x10E , 22 x 10E

Scorpion SII-55 series is the second generation of high efficiency electric motor from Scorpion that are widely used in 30cc to 40cc aerobatic airplanes, and up to 50cc Sport/ Scale Airplanes. They have proven technology in new magnet configuration and housing design to provide higher efficiency, higher power, less eddy current losses with lower internal resistance than our previous S-55 series.

Scorpion starts with premium material with high quality aluminum alloy parts that are produced on the latest CNC milling machines. These parts are then gold Electro-coated to provide a beautiful, long-lasting finish. The stators are made by top grade 0.35mm laminations to give maximum efficiency, and minimum Eddy current losses. The stators are epoxy coated to prevent shorts, and are wound with wire that is rated at 180 degrees C (356 F). The magnets used in Scorpion Motors are custom manufactured to be able to withstand high temperatures.

Scorpion Motors are built to last, and are backed with a 2-Year warranty against defects in materials or workmanship.

HK Design Patent No. : 1201208.6

CN Design Patent No. : 201230267986.0

Taiwan Design Patent No.: 101303643

All other worldwide Patent: Pending

Scorpion SII-5525-210KV


Stator Diameter 55mm (2.165 in)
Stator Thickness 25mm (0.984 in)
No. of Stator Arms 12
Magnet Poles 14
Motor Wind 17 Turn Delta
Motor Wire 18-Strand 0.33mm
Motor Kv 210 RPM / Volt
No-Load Current (Io/10V) 1.11 Amps
Motor Resistance (Rm) 0.026 Ohms
Max Continuous Current 90 Amps
Max Continuous Power 3150 Watts
Weight 708 Grams (22.98 oz)
Outside Diameter 66.4 mm (2.614 in)
Shaft Diameter M8*1.0
Body Length 59.82 mm (2.355 in)
Overall Shaft Length 106 mm (4.173 in)
Max Peak Current 135 Amps
Max Peak Power 4700 Watts
Max Lipo Cell 10s
Motor Timing 5deg
Drive Frequency 8kHz

Included in the Box

1x Scorpion SII-5525-210Kv Motor 
3x Female Connectors
3x Heat Shrink
1x Cross Motor Mount
4x Screw
1x Thrust washer
1x tapered collar
1x spacer collar
1x Prop washer
1x Prop nut
2x Nut lock

Weight including packaging


Data Chart


Full Dimension


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Spinner Bolts

Socket Head 5mm x 70/80/90/100/120/140mm
6 sizes for most spinners



Fourtitude V2 Smoke Tanks 20oz

20oz Smoke Tank

*Fourtitude has amended their fuel tanks due to federal regulations on shipping fuel containers. Check out the video below to see just how easy it is to assemble the tank!

Take the guesswork and worry out of properly setting up a smoke system in your aircraft with these easy to use 4titude smoke tanks!

We've been receiving a few requests for the smoke tanks and as usual Redwing RC has LISTENED! Introducing the Fourtitude Smoke Tanks available now at Redwing RC! You're welcome :-)




  • Crystal Clear allowing quick visual checks of any possible pollutants in your smoke tank.
  • Lightest weight commercially available R/C smoke tank on the market. Many cases less than half the weight of the older roto molded “standard” tanks.
  • Aerospace Mil spec sealant used in assembly to assure the tank will hold up to many high G loaded flights!
  • Incredibly resilient and truly seamless tank body with a threaded on closure
  • No rubber stopper to crack, leak, or split your tank apart.
  • Detailed installation instructions.

    Fourtitude R/C RTU Smoke tanks include: A high quality double sided hook and loop mounting strap, precut to shape foam mounting pad, and Fourtitude R/C blue fuel line to plumb your aircraft. Everything you need to get smoking up the sky ASAP!

    These crystal clear plastic tanks are square shaped which makes mounting into your aircraft very simple. Every tank is QC pressure leak tested.

    20oz Fourtitude SMOKE tank



EPP SBACH342 3D Airplane 39.4" (1000MM) Wingspan

31.5" EPP 3D Airplane YAK55 Features: • Kit version - Assemble and install your choice of electronics • All hardware accessories included in kit • Durable EPP material with realistic printing resemblance of a shark • Simple to build Specification: Wingspan: 800mm Length: 875mm Flying Weight: 400g Suggested Power System: Motor: 2212 1400KV ESC: 20A Servo: 9g *4 Propeller: SF 8-9inch Radio: more than 4CH BATT: 2S 1200-1500mAh (Not incl.) Different versions supplied as below: E1701=E17 YAK55 KIT+APC SF9047 E1702=E17 YAK55 KIT+Motor(2212 1400KV+3.5mm Banana Male Plug+3.0mm Prop Adapter) E1704=E17 YAK55 KIT+Motor+ESC(20A E-Power+3.5mm Banana Female Plug+XT60 Plug)+Servo(9g*4)