Catboat15 (who he?) wrote:- > Engines > designed for slow freight hauling had small drivers for more torque and > less > speed, while the fast locomotives for express passenger service had large > diameter drivers.
Very true. The old time CME's rule of thumb was "one inch of driver diameter per mph of designed top speed". This equates, in all scales, to about 365 rpm, which itself is determined by the rate at which steam can be got into and out of the cylinders. Some stationary engines, such as that fitted to the Class A Climax for instance, were designated "high speed" and might manage anything up to 600 rpm. Mike Chaney _______________________________________________ SSLiveSteam mailing list Send messages: [email protected] Cancel subscription: http://postfix.45mm.com/mailman/listinfo/sslivesteam Rules: http://www.45mm.com/sslivesteam_guide.html
