This is my third prototype of an electric outboard motor boat. This third version adds a Lego remote control controller(8884) and a Lego remote control receiver(8885) to operate the propellor drive (a Lego PF M-Motor, 8883) and the steering motor(a Lego PF M-Motor, 8883) geared down by two 40 teeth gears). I kept the AAA battery box(8800) because it fits perfectly inside the hull. However, I totally rebuilt the outboard propeller transmission/driveshaft which previously used the older studded technic bricks so that it now uses the newer technic studless beams/axles. The steering motor is mounted on the floor of the ship's hull using an angle "L" 2x2 studded plate; the gearing down by two 40 teeth gears is necessary to slow down the motor speed so centering the rudder is possible. An alternative rack-n-pinion steering design without the speed reduction mechanism could not easily center the rudder and was abandoned. The newer technic studless design is both lighter and stronger than the previous design based on the older studded brick plates.. This boat was *bathtub* tested (she floats upright). She can glide forwards and backwards at about one foot per second. She can steering left or right - but the steering control is touchy since there are no steering guides to restrictions on how far the rudder can turn. I kept the black stablizer wings (I think they look cool) albeit I don't think the boat is going fast enough or that the wing surfaces is large enough to provide any increase in stability. Curiously, the bottom of this hull has connectors for a non-remote control battery power propellor drive unit which came with the the first version of this police boat (lego has omitted them in the newer versions). The ship uses six AAA batteries - the powerpack *on* button(green button) must be turned on before she'll respond to the remote control unit; when the power pack is on, the "green" led light goes on. The remote control unit uses three AAA batteries and always off until you push the lever - A green led blinks on the remote control receiver on the boat when it has successfully received data from the remote controller.
Quoting Polomoche Mann
An Excellent creation now better than ever! Are you game to test it in a lake or dam?
I built this RC boat after seeing some amazing lego remote control speed boats on youtube from europe whose design and whose operator's skill far exceed my own.
I've since disassemble my RC boat - however, if I have the time over the summer, I'll reassemble her (probably with steering mechanism improvements and a new mocpage) and maybe I will post a youtube video of her scooting about out in one of the nearby stormwater management ponds close by to my home. The major challenge with beta testing a Lego RC watercraft system is that it has limited range so I can't afford to have it go further than 5 meters where there is even a small amount of current. In addition, even if I put XL motors on her - any strong current would essential pull her away from the RC range which is a max of about 10 meters ( which means she'd be lost at sea, or I'm going to get very wet retreiving her). The safest local beta site testing site would be a wading/swimming pool (?maybe I can get permission from my community swimming pool?). The Lincoln Memorial Reflecting Pool will be reopen sometime in the summer of 2012 - if I have some time - I'll rebuild an improved version of this Remote control electric boat and sail her there... If I can get a partner or if I can get an onboard DVR - I'll post a youtube video of her exploits. ...I've acquired more advanced lego technic partss - and I believe I can make a more compact, stronger, more durable, and accurate steering mechanism.