Somebody did mention issues of scale, and the smaller the boat the less well it sails. Within limits this is true, and true irrespective of scale. However, many models fit into this overall model length of about 1m. There are well tried work arounds for scale issues.
Ultimately you have to be able to transport you model, not only to the lake side, also to put the model into the water. That is why many fall within that 1m bracket.
If you do a google search you will find 1:350 model aircraft.