Thats right Baz , shortened ( and obviously reprofiled to suit ) Lancaster blades . A guy who flies at our RC club works for SAFE and said it gave him the ” willies ” cutting the tips off servicable Lancaster blades with a band saw . I think he said it was 6 inches off ( but it was ages ago , so dont quote me on that ), and I think I recall him saying that they did 12 in total . Not sure if the extras were for spares , or a different project alltogether .