My first book has made it all the way to the publisher's desk, where I'm told it will sit until I have a second. The first was a bit of cliff-hanger. I'm working very hard on the second and hope to have it finished by the end of the summer. Actually, I hope to have it done in two weeks, but it will take all summer for my wife to fix it. (If you can't write, but discover a need to write a book, I suggest you marry an English teacher.) The books are sci-fi and the story line is about a section of a maximum-security prison that marooned on an Earth-kike planet stuck in the stone age. My creative prisoners are now building a boat to make contact with the natives. I am thinking about creating a windmill devise to power a propeller. I'm also still trying to design the ship. (it needs to be large enough to carry 100+ on a 2000 mile voyage.) Sail will provide the main propulsion, but I thought about using a windmill for special work like very narrow channels, or to maintain headway in a storm. Now for the question, given steel, wood and welding supplies, how would you construct a such a windmill, and more important a propeller? I need to add they have a parking lot full of cars, but almost no fuel.