Viper for Q-500
Does the Great Planes Viper hold up for a Nelson engine and is it competitive (the Viper that is).
I have Viper in our Q-500 class (We race 6,5cc sport engines, with 10x6 plastic props and 80/20 FAI fuel) and it is a very good flier and it behaves very well in the air.
Most prefered engine over here is the Webra .40 GT, as it turns a 10x6 RAM or Graupner Cam prop at 14000-15000rpm on 80/20 fuel. Speed is around 180km/h for the fastet airplanes.