Now its my turn...
I think that most posters so far have been right. I fully agree with Zetec. I have 2 boys (11 and 13) and they like excitement. To them, watching a beautifully built tug, sedately and expertly towing a barge is like watching paint dry. They want white water, noise and spray: speed essentially. I have a MTB which they very occasionally show interest in (oh, doesn't it fire anything?). I also have a couple of electric buggies which they love...because they're, and I'm quoting here, 'not boring'. However, I think that speed and excitement is only half the story. The other half is time. I was more than happy to spend a year of evenings and the occasional weekend constructing my pride and joy MTB. Getting the average kid to concentrate for more than 10 minutes at a time is a virtually impossible feat! As I've said, I have 2 electric buggies, both kits from Tamiya. They took 2-3 hours to assemble, each. The kids, both, were fascinated. No glue was involved, just screws and nuts and bolts. They could see that in a couple of hours, they'd be finished: the sort of time frame they can understand and cope with, as opposed to several months away from finishing. From a building point of view, there seem to be either the full kit (ages to build and still needs rx, servos, linkages, batteries etc. once the box is empty) or the RTR which is usually slow, easily broken and on the same frequency as every other one! To get kids involved, someone needs to provide a Tamiya-type-electric-car boat kit: bolt together and screw together without glue, everything, and I mean everything, you need in the box. Also, once finished, it needs to be fast and look good without being too delicate. Additionally, it needs to be able to be upgraded: racing props, faster motors, ball raced gear box, trim tabs etc. This type of kit just doesn't seem to exist and I'm sure that with a little thought, they could be on shelves quite quickly. What would you get in this mythical kit then?
Sport boat type fast planing hull, 1 piece moulding
Suitable deck/cock-pit/hatch etc.
Accessory kit: windscreen, cockpit details, lights, ski-pole etc
Outboard or Z type drive, nothing assembled, all there, ready to be built, including 540 type motor
Battery box
Radio box
Servo
Steering linkage
Drive battery
rx - proper, 27MHz, Futaba/Acoms etc
tx - proper, 27MHz, Futaba/Acoms etc
Drive battery charger
No glueing required
No soldering required
Provide an Allen key if need be, otherwise all the builder needs is a modelling knife, side cutters and a Pozi-drive screwdriver
Design it so that, ignoring painting, it will take around 2-3 hours to build, just long enough to charge up the nicad pack with the charger that came in the box. By Christmas afternoon, everyone is down at the lake, blasting around in their (unpainted) speed boats. By February of course, some boats have sunk, some boats have broken and some owners have got bored...but some have got hooked, along with their mates and will stay so for years to come.
Of course, another problem to overcome is where to sail one's boat? I'm lucky, I can pop down to my lake which is 10 minutes away. Though it is salt water, it has all round concrete access and free parking all of 2 yards from the water's edge. Many, many more of you have to spend an hour in the car to get there before you can launch your pride and joy. The great advantage of an electric car is that you can drive it around the lounge the moment you finish it. Even so, a bolt and screw together, cool looking model kit, not a toy, with gear boxes and other mechanics in it which results in an impressively fast model, I think would be a winner. But then I would think that, it was my idea!
Mike