Interesting that the Russian/Ukrainian Control Line F2D engines (Fora, Cyclon, etc.) are making their way into the RC Combat field. Must be Lee Liddle's influence. These are nicely made engines, very lightweight (about 4 ounces), but they have their drawbacks. They run best at ungodly RPMs (30,000 or so), requiring the use of a hand made fiberglass prop. F2D rules limit the venturi size to 4mm, the engines can probably withstand some opening up of the venturi, but too much and they'll likely blow up. With the suggested prop (see below), a good one will drag a 400 sq. in. F2D model around at 90 mph (that's on 52 foot lines - probably go faster in RC without the line drag). The Fora is around $200, but the latest Cyclon can be had for considerably less (I think $100). (There are a bunch of others, btw. - Redko, AKM, Viper, Kodjol, etc.)

I think there is a Cyclon version with a RC carb, but I think the Fora comes set up for CL - no throttle. I'd be interested to see how various people solve that particular problem.

Incidentally, there's a Fora .29, too, specifically for Class B RC Combat (from George Cleveland's web site). Most likely a destroked .36 (for CL Fast Combat use).







RC Cyclon: