Rowly -- one of the pondowners I work with has Koenders windmills. All of them are in concrete pads. Perhaps some other folks can tell you if the metals stakes would hold. If not, let me know via this website, and I'll give you an e-mail address for that pondowner. I'm sure he would be glad to explain to you why he decided to go with the concrete pads (the wind blows "once in a while" in South Dakota).
I'll bet someone will give you a good answer on the friction loss from the extended hose. There are a lot of people on this website with far more practical knowledge than me. However, I'd bet that the friction loss in a narrow (1/2 inch) hose would be pretty substantial over 100 feet.
Dave
