I'm planning to make a 1:10 scale working model of a David Drake fiction called a hover-tank
it has eight fan nacelles, and its thrust and steering as described in the books are going to be interesting-to-impossible to accurately model... which is why I want to try.
I'm an idiot that way.
Welcome to the club. I am making ZIS-5 and ZIS-6 trucks from scratch in 1/72 scale (these are going to be complete, faithful and terribly small replicas).
Okay, do you have a questimate as to what the tare weight of the critter will be? It doesn't have to be exact, just a good ballpark estimate. That total weight estimate will help determine which fans whould be best.