R/C "Spray" Boats

The Davy Jones spray boats are small and simple-built radio controlled models, that gives satisfaction as entry-level r/c boat-models. I bought one of them, in Italy I found it at 45 euros, a little catamaran powered by two electric engines that should push the boat at 20 Km/h. http://www.techobby.com/Davy-Jones-Electric-RC-Boat-p/eb-1.htm

The battery included is a 7.2 V with 700 mA, as printed on the battery pack, but I found in the Net 1700 mA... However, the box includes one radio control with l/r Steering and Forward, while there is no reverse, that I think is quite strange for electric motors. There is no rudder, so the steer is due by the propellers alternation. http://www.made-in-china.com/showroom/brenda754/product-detailzemxkgEPIvrc/China-Davy-Jones-RC-Spray-Racing-Boat-3352-.html

I made many tests on a calm place in the Serio river, with no water flow, the behavior is quite good for this low-price entry-level cat, but my own boat is still turning on the left when full forward and neutral steer. I re-filed the props edges with no results, I saw there is a short play of the spin on the left engine rod, while the right spin is well fixed. This one may cause the left-steer of the cat. http://www.valseriana.bg.it/recommended-to-see-to-do/trekking-sport-nature-wellness/paths-and-nature/serio-river/

At last, engines spins only when touching water, this could be good for fingers! There is a white led on the top of the boat, and a red light on the controller that swicht on when the battery is low, about 10 minutes. http://www.funrctoys.com/eShopWeb/product-7167-DAVY_JONES_RC_RTR