@VeMar the only two real rules are: it cant be a seaplane by construction (like your average boeing 747) and it nees rectractable swimmers if it fits both bills it is considered as a participant. it can be a single wing, a canard or like i said something that isnt able to land on water by its own fuselage.

@Irobert55 Hi thank you for your response. To the future I want make some other seaplane and your challenge sounds good.

i have noticed that you have build a seaplane. that looks also not totaly bad. i have a challenge up for seaplanes that are based on planes that are not inharently seaplanes (planes with engines under the wings, canards and single wings).