http://www.wood-carver.com/gemini.html
Here is an easily copied carver for making blades.
Don't let the price scare you off. The steel and bearings can be bought for $400.
If you can weld or have a friend with a welder, you can build one big enough for any lenght blade.
You can substitute a circular saw for the router for rough excess wood removal, then install a router for fine finishing.
http://www.woodwizz.com/wood_wizz_copying_attachment.htm
Another copier, this one must be upsized for longer props.
http://www.copycarver.com/building.htm
This is a very economical blade copier.
Almost all wood, built it in a weekend.
If you wish to automate the process, you can computerize the cutout.
Build your own computerized router from information at
http://www.cnczone.com
This site show many homebuilt computerizes copiers and routhers.
It has forums, pictures of completed projects, question and answers for cheap to expensive CNC machines.
