Hi Carlos,
Just to clarify my earlier post.
The drawings for the Chieftan paddle wheels are shown as MM1244 and for the Forceful paddle wheels as MM1293.
If I remember correctly George Baker produced the drawings for the Chieftan wheels back in the mid seventies and for the Forceful whees a few years later. I can always dig out the original articles if it will help you!
Regards
Grumpy