Dave Krafft's Yellow Submarine.
Dave added a Coroplast body to his homebuilt tadpole trike.
Three sheets of coroplast, 3 rolls of tape and lots of light gauge aluminum. Total cost under $100. Total labor about 200 hours.
Dave says cruising at 21-22mph on the flats is no problem.
Built as a bottom tub, everything from middle up is just taped on. He started by putting foam on the ground for clearance, and pedal clearance. Then he started making loops to define the shape, and then added bits in to get the actual framework. Skin is just popped onto the framework. Top is taped on, but then it's a big hassle to take it apart. In theory it'd be possible to tear the body off on the roadside in an emergency.
Rear end has an isolated "dirty compartment", under a tailbox storage area that stays nice and clean. However, the wide body allows him to simply lay packs on the tub, alongside the seat. Higher, and less convenient, the tailbox sits empty most of the time.
It's got a tough plastic step plate in front of the seat, so you can climb in and out without stepping on the coroplast bottom.
Drawback to getting the floorpan nice and tight is that there's no way for dirt to get out of footwell.
Biggest problem is the headlight, which keeps shorting out. Wouldn't be a big deal, if it weren't so hard to reach inside the nose of the fairing. Nose is PETG, could also be lexan. Having it clear helps in low speed maneuvers.
The nose must be sturdy, after the finish of the "Studless" circuit race, Mark spun his trike out. Dave rammed him (He SAYS it was unavoidable) hard enough to tip Mark's trike over, without damaging the nose of the fairing.
Breath on windshield turns to frost at low temps. Dave added 2 strips of coroplast under the windshield, oriented so that air flows through the channels. A smaller deflector shield sends air from the coroplast channels up the backside of the windshield. This keeps things clear when he's moving, but he still frosts up when stopped. Next step is to use a battery powered fan in a NACA duct (powered only when stopped) to blow air on windshield.
Return to February 2002 Meeting Report