Just a note to tell you guys that your advice was first class. I bought the Aerofly Pro and have installed it on my laptop, I'm highly impressed. Don't have Tx with me in London but I can see the efforts of the models trying to fly with the absent transmitter 'default" values, full throttle and all controls in the corner, cant wait to try it with a Tx and get the add-on to include a Bobcat. !

and a public thank you to Sara at Wren, I now have the drawings for my spot welder, thank you again, Sara, and to you guys for your help.

David.