Free Model Airplane Designs

Need some help guys!!! know-it-alls are a must!!?
(or girls, sorry about the political incorrection)
I need a few questions answered, ill be brief, here they are:
1. Any free 3d website that will allow me to create my own aircraft or basically let me design what I want (I know its in the wrong topic but i want to save points.)
2. what is the pros and cons in a small craft propeller made of wood or metal
3. what is the best propeller design for the back of a flying craft ( like this —–o—– or <^> a triple propeller one)
4. what is the best sized propeller for a roughly 9-15 ft long craft ( remember the propeller is in the back!!!)
5. I need as much specs as you can give me on lawn mower motors, I need to know horsepower, rpm, wieght, size, gas consumption and any little tidbit about them (like cooling facts)
6.any free online airplane models (not the mini balsa wood ones) but actual how-to build a flying craft.
7. the price of aluminum rods, and sheets (please state any size and price)
TY!
For creating 3D models, try downloading milkshape. It’s free and and easier than most programs to create 3D models. It’s on http://www.swissquake.ch/chumbalum-soft/
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