RE: Cox .049 max RPM?
[link]http://home.earthlink.net/~lloydfour/speed.htm#1/2a speed[/link]
1/2 A Speed engine size .05 ci AMA record speed 156.42 mph
This class allows unrestricted airplane designs. They are full-bodied and streamlined to reduce drag. The model design may be a conventional or an asymmetrical design. The current trend is to build asymmetrical models. Speed models do not have landing gear to eliminate drag. They use a takeoff dolly and land on the belly of the fuselage. Flight control is usually via a mono line system.
The engine of choice for 1/2A at the moment is the CS .049. Visit the CS web site for the engine specs. 1/2A Speed is one of the speed classes that allows unrestricted exhausted systems. That means you can use a full wave tune pipe. Fuel is also unrestricted. Think of it, 80% nitromethane and 20 % oil. It's quite exciting!
Here's a picture of Charlie Leggs' 1/2A Speed models, then and now. 1953 - 1998. The speed has climbed from 90 mph on 35 foot lines to 155 mph on 47 foot lines.
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[This is news to me...156 mph..!][X(]