In addition to the various responses already posted, I must add that your "plastic magic" Revell display model conversion is in all probability a little small for open-water sailing.
I have completed a number of such models which being small are really great for steering completions around the harbour - or on small pools in the park.
However, on larger lakes or on open water, they can definitely be over-powered by any notable wind and\or waves. Thus with a 12-18 inch long converted plastic model even a 5-knot wind may well be too much.
In short, please keep your model for calm conditions and leave the blowy conditions to model yachts or to those with larger powerboats.
If not, please at least ensure you have plenty of build on buoyancy such as cork or polystyrene - - it could well save your carefully built model from a watery grave!!
With best wishes. John😊😊😊😊😊😊