I’ve wanted to build this pump for a few years but couldn’t figure out what material to use. I found this web site and knew I was in the right spot. I’ve never worked with carbon fiber before. I read everything I could find on the different methods and decided on infusion.
OK, I need to move at least 3,000 gals. of water a minute to feed my oyster nursery. Most people use an ice eater pump or a paddle wheel but I have no access to electricity but I do have a 1 knot current passing by the nursery so here is my tidal powered pump. I live on an Island and we have the highest electricity cost in USA. The big prop is 9 feet in dia. by 55" pitch that will
In the pictures it’s upside down. It will hang off the back of my upweller. The small prop is at the end of a 26 foot x 40" x 40" tank with oyster seed covering the bottom on mesh screen so when water is removed from the tank it is replaced by water passing through the seed. I hope it works!
I wish I could make the picture smaller but don’t know how. Sorry
Then I laid down three layers of 2x2 twill fiberglass then I painted it with 3 heavy coats of epoxy paint and sanded it down to about 400 grit. Here is the finished mold. Inside the cavity I wired 3 100 watt light bulbs with pie plates over them so the surface got to about 110f degrees in an 85f degree garage. 
The blue tape was my flange area and I didn’t want to get any release agent on it. I didn’t know what I was doing! Now I know the yellow tacky tape will sticks just fine. My layup was 5 layers of 2x2 twill carbon fiber, 1/8" foam and 5 more layers of carbon fiber alternating from 0/90 to 45/45. the foam stopped 2" from the edge and I laid 11 layers of 2" fiberglass tape to make up the thickness of the foam. Here’s my setup.