Sorry about the delayed reply, I run my airboat in Victoria, BC, which gets very mild winters, we're lucky if a few inches of snow ever falls and stays for more than a day. Right now I am going to school farther north, and yes there is only ice here. I'll have some more detailed pics when I get back into victoria in a week. The engines are .40 size, and swing 11x7 master airscrew props. Each engine's throttle is controlled by its' own servo as is each individual rudder, making 4 servos in total. Each engine nacelle contains an 8oz fuel tank, 2 servos and one nacelle gets the battery and receiver pack. The hull was built out of 1 inch polyureathane foam, covered with 2 layers of 4 oz cloth and polyester resin( i am on a budget). The nacelles were built up out of balsa and normal wood glue, and then covered with 1 layer of 4oz cloth and waterproofed the wood. The plywood support for the nacelles was a special part of the project due to the fact that i completely fabricated them from a piece of pine 4x4. First I ripped a bunch of pine strips about 2.5 inches wide by 1/8 of an inch think on a table saw, i then sanded these and sandwiched three together with glass in between running 90 degrees to each other, and finally a layer of glass on the outside. The result was a pretty strong, light piece of plywood, that was waterproof and was about 3/8 of an inch thick. Since this project is still in the prototype/testing stage, it is a little ugly looking. I hope to add some sponsons and cowls to make the nacelles look more sleek. I think what i'll do for the servos is try an build a casing around them, and put some grease or vaseline in the servo body. After a day of drying everything was allright, i was actually surprised when i opened the receiver case and there was no water in it. I'll have more pics up in a week. Cheers!