This is the same as the velocity compounding in my spreadsheet if you want to play with it. I've made an updated 'final' version, but I think I'll post about it in a new thread so we don't keep clogging this one with non tesla turbine stuff.Toymaker, If you can get a copy of "Model Steam Turbines" by H. H. Harrison, then towards the last few pages there is a method of making a multi-stage impulse turbine where the exhaust from the first jet stream is taken and doubles-back to make a second hit of the blades, etc. up to 9 times, thus extracting real useful energy from the rotor by multi-staging a single rotor. Plus some mathematical explanation.

Any use?

K2