Typical wcl values for models. slow flyers and thermal gliders – under 4. trainers, park flyers, 3d – 5 to 7. general sport and scale aerobatics – 7 to 10. sport and scale models – 10 to 13. warbirds and racers – 13 and over. if you would like to download this calculator in an excel format, please click here. Rc boats is the perfect hobby for boaters that love insane speed. this is the guide for those interested in the hobby of racing the fastest rc boat!. Rc groups – the most active radio control model community: electric and fuel rc airplanes,rc helis,rc boats and rc cars. features discussion forums, blogs, videos and classifieds..