Stepped Hulls (again)

[PetterM]

I am currently trying to learn more about stepped hulls, reading all information I can get hold of. As far as I can gather there is not much published data on how to calculate the performance of boats with two-step and I particular how to calculate the interaction between the different planing surfaces, the shape of the wake etc.
How can I get hold of these papers? Are they worth buying?
22
Robert W. Hobbs
Model Test Results for a Two-Step High-Speed Power Boat Hull Form
R (17)

10
Robert W. Hobbs
Model Test Results for a Two-Step High-Speed Power Boat Hull From
DD (3)
I have read some of the papers by E Clement, and they are all brilliant, any other suggestions on what to read.
I am based in Southampton UK.

Thanks,

Petter