Hi Freebeard,
Thanks for responding. The overall length of the bus is 20 feet.
Sorry, I guess I had been thinking in terms of straight lines not in terms of curves  for simplicity of construction. Going back to the RV Aero thread I can see he did curves also. Hmmm, I wonder how much of a problem that is if I stay with straight lines?
I could probably figure out how to do curves but I would still need to know how to design it all ie how to calculate the size of the rear end of the boattail. Again any sugguestions on how to calculate that? And then how to calculate the taper needed for the curve. I get that there might be an answer in the graph but I have no idea how to translate that into my situation.
Thanks again for the help,
Bill
