The pistachio class is for scale free flight rubber powered models of either not more than 8'' span or not more than 6'' overall length excluding propeller.
The judging rules used for the Pistachio scale class are the BMFA-rules, which are also used in the IIFI and British Indoor Scale Nationals competitions: Pistachio [62 KB]
Rules for all scale classes:
General scale rules [75 KB]
Judges guide [95 KB]