The radioracing engine Cyclon-40PR

The specification:

• The engine fully complies with rules FAI F3D
• 3.1 BHP for 30000 RPM
• volume 6.53 cc
• bore 21.5 mm
• stroke 18 mm
• rear intake, disk valve
• front ballbearing 8 x 19 mm
• crank rear bearing 12 x 28 mm
• crankpin 6 x 6 mm chromed
• wrist pin 5 mm diameter
• piston/liner ABC three fuel ports
• liner timing 130^o x 190^o
• valve timing 20^o x 70^o
• glow plug type - Nelson or Novarossi Turbo glow plug No.7
• spinners 1.5" or 2"
• weigt 330 g about
• mount - Nelson type normal
• propeller type - 2 blades carbon 175 x 175 mm