Hello Michael and Anthony

Thank you very much for your comprehensive replies.

I will read the replies in detail this evening and I think I will then be able to get a model that we can use to machine a prop mould from.

I create the blade surefaces with a network surface using two aerofoils, one at the root and one fairly close to the tip and with a wire for the leading and trailing edge.

I think my aerofoil might have been a little crude and rustic at the leading edge, I will get an elipse onto the leading edge.

Burrman is a clever guy, I think he is still around, I bump into him on the Bobcad forum sometimes.

Many Thanks

Barrie