Hi

The 2008 to 2011 FAI rules for F3A states the following:

Maximum overall span 2 000mm
Maximum overall length 2 000mm
Maximum total dry weight, with batteries 5 000g
A tolerance of 1% to be allowed for all above measurements.

Power Propulsion source limitations: Electric-powered model aircraft are limited to a maximum of 42.56 volts for the propulsion circuit, measured less load, and prior to flight while the competitor is in the ready box.

Burt