The competition categories that need high power output and speed can turn at very high rotational speeds for a reciprocating engine. A engine used in the FAI Speed event may produce as much as at rotational speeds in the range of 45000 rpm - faster than some full-scale turbojets. The specific output is around 1200 hp/liter which is far in excess of racing motorcycle engines or Formula 1 auto racing engines. Many breakthroughs in two-stroke engine design (both model and motorcycle) can be traced back to C/L speed models, as the small size makes it easy to experiment with new designs at low cost.