OS Speed ​​.21 Engine R21 "EURO" II SET - 1DR01

CHF 436.13

  • O.S. Speed .21 Engine R21 "EURO" II SET - 1DR01 - RCXX - rc racing for professionals
  • O.S. Speed .21 Engine R21 "EURO" II SET - 1DR01 - RCXX - rc racing for professionals
  • O.S. Speed .21 Engine R21 "EURO" II SET - 1DR01 - RCXX - rc racing for professionals
  • O.S. Speed .21 Engine R21 "EURO" II SET - 1DR01 - RCXX - rc racing for professionals
  • O.S. Speed .21 Engine R21 "EURO" II SET - 1DR01 - RCXX - rc racing for professionals
  • O.S. Speed .21 Engine R21 "EURO" II SET - 1DR01 - RCXX - rc racing for professionals
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O.S.

1DR01

CHF 436.13
CHF 436.13
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Product Description

The OS Speed ​​R21 “EURO” II is the logical evolution of the successful R21 EURO Spec. and was specifically developed for the demands of European racetracks with long straights and high continuous loads. It combines smooth, easily controllable power delivery with increased performance in the low and mid-range RPMs – ideal for consistent lap times and precise handling.

The revised crankshaft with three tungsten counterweights significantly improved torque at low and mid-range RPMs. At the same time, idle stability and throttle response benefit, making the engine particularly easy to tune and control – even during long races.

A completely redesigned 7-port cylinder , an optimized piston, and additional cooling ports in the exhaust area ensure improved internal cooling and smoother power delivery. The newly developed crankcase further supports improved gas flow and temperature control.

The outer cooling head adopts the proven design of the R2104, offering excellent cooling performance with reduced weight. Laser engraving emphasizes its high-quality racing character. Inside, an oil-resistant O-ring (black) , also from the R2104, ensures a reliable seal and consistent combustion.

The engine is delivered as a matched EURO combo set , consisting of the high-performance TR01 resonance pipe (EFRA 2098) and the MR02 manifold – perfectly matched to European high-speed layouts.

The standard 21M2 (B) carburetor with Ø8.5 mm venturi insert is popular with many top racing drivers and stands for maximum performance with very good drivability.

Scope of delivery (combo set)

  • OS Speed ​​R21 EURO II engine
  • TR01 Resonance tube (EFRA 2098)
  • MR02 manifold
  • Glow plug RP7
  • Exhaust sealing ring
  • Dust cap set (Ø3 / Ø16 / Ø18)

Product features

  • 1:8 Onroad Nitro racing engine .21 / 3.49 cc
  • EURO II version , specifically for European racetracks
  • Revised crankshaft with 3 tungsten counterweights
  • Noticeably stronger torque in the lower and mid-range RPMs
  • Very stable idling characteristics & smooth RPM drop-off
  • New 7-channel cylinder & optimized piston
  • Additional cooling vents for improved thermal performance
  • Cooling head design like the R2104 (lightweight & powerful)
  • 21M2 (B) carburetor incl. Ø8.5 mm venturi
  • Ideal for long straights and tough racing conditions

Technical data

  • Engine displacement: 3.49 cc / .21 cu in
  • Bore: 16.08 mm
  • Stroke: 17.20 mm
  • Power: 2.8 hp at 35,000 rpm
  • Practical speed range: 4,000 – 45,000 rpm
  • Weight: 340 g
  • Engine type: 2-stroke nitro
  • Cooling: Air-cooled
  • Intended use: 1:8 On-road Racing
OS Speed ​​.21 Engine R21 "EURO" II SET - 1DR01

CHF 436.13

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