Break in motor mount for ROTO 25V gas engine


By Mark Primavera - in category Senior telemaster construction with 0 Comments


Back in December 2014 I received my ROTO 25 V - single cylinder two stroke gasoline RC airplane engine and started construction of the break in motor mount. These photos show the initial setup of the motor mount.

Specifications of the ROTO 25 V:

Roto Motors are manufactured by one of the leading model engine company from the Czech Republic. No expense has been spared with any of the materials and components used to produce this range of quality high performance petrol engines. Roto Motors use a Rotary Valve Induction system to aid easy starting and smooth consistent linier performance with a slow idle speed. One of the only petrol engine manufactures to use conventional model type engine mounting system on the 25 and 35 size engines. This allows easy installation into most aircraft. Fully shielded electronic ignition system insures no interference with your transmitter signal.
Manufacturing Technology
Crank case

The engine case is rough cast Aluminium then CNC finished to the highest tolerances finished with a strong heatproof powder coating.
Cylinder sleeve

Manufactured from one piece of dural with pressed insole from the mild-granular cast iron. It is then shaped and honed to the correct size.
Piston

The Pistons are cast from high quality Silicon Alloy and machined to a high tolerance.
Crankshaft

The Crankshaft is hade from one piece of high grade steel machined then hardened. All components are carefully cleaned and scanned to verify they comply with the strict tolerances Roto Motors demand.
Specification

  • DISPLACEMENT: 24.9 ccm
  • BORE: 34 mm
  • WEIGHT: 1 100 g / 2.43lb
  • PISTON ROD: 2 × NEEDLE BEARING TORRINGTON
  • CRANK SHAFT: 2x BALL BEARING NSK
  • IGNITION: PROCESSOR CONTROLLED
  • Fuel/Oil: 32:1 break in, 50:1
  • Fuel Consumption: ~1.5oz/min
  • RPM RANGE: 1800-9000rpm
  • PROPELLERS: 2-Blade- 18x8, 18x10, 19x8
  • 3-Blade: 16x10

 

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