As nouns the difference between yachtsman and yachty
is that yachtsman is a man who sails a yacht while yachty is a yachtsman or yachtswoman.
As a adjective yachty is
of or relating to yachts.
yachtsman
English
Noun
(yachtsmen)
A man who sails a yacht.
yachty
English
Noun
(yachties)
A yachtsman or yachtswoman
Adjective
(er)
of or relating to yachts