Thanks for the Reply guys. I'm looking to make a tunnel with an electric motor since the pond I will be playing around on is in a neighbor hood that I will be moving into. I don't want to piss of the neighbors too soon. Jerry thats cool that you are making 1/4 scale hydros. My Dad and I have been taking his old race boat plans and scaling them down to 1/8 for models.
If you could recommend which tunnel would be good for an electric motor that would be great. I want to get started in this hobby to keep me out of trouble..