This one fifth scale model helicopter, designed by Jim Morley, a former British aerospace engineer, was built using aluminium parts supplied by precision extruder Minalex, Banbury. The company, a supplier to the instrumentation and printing machine markets, produces extrusions to much tighter tolerances and in smaller quantities than generally available, it claims. `We are looking to go about one sixth of the BS tolerance, ie down to +/-0.03mm,’ says Euan Hussell, general manager. That is achieved by tight control over the process including billet temperature, speed of extrusion and die tooling design. Minalex supplies Morley with extrusions including the skis and fins for the rotor. Morley Model Helicopters are available in kit form in rotor sizes up to 1.5m.