Two of my .05 powered boats. Usually run with 7x1700mah Panasonic sub C cells.
DPI Leisuresports Crackerbox. 18 inches.
Both of these boats are much faster than the Tigermoth. Both are also seriously overpowered. You almost need a pilots license for the Crackerbox. It spends as much time in the air as it does in the water. IMHO these boats were a big help in learning going away/coming towards R/C reflexes before I tried flying.
Warehouse Hobbies 18" EForce.
Crackerbox powered by .05 motor, 16 turn-double. Astro 207D ESC. Homemade aluminum water cooling coil.
E Force powered by Astro Flight 05 Cobalt, 6 turn. w/ Astro 212D speed contol