Flight Crew Commercial; Flight Crew Instrument
Flight Crew Last 90 Days 15; Flight Crew Total 5153; Flight Crew Type 3
Training / Qualification
Ground Event / Encounter Object; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Aircraft Aircraft Damaged
Human Factors
Spent the morning examining and flying an experimental Smyth Sidewinder. The aircraft was being purchased by a friend.  ASOS reported wind 310 degrees 19 gusting to 27. Started the approach in light turbulence. On touchdown; the aircraft made a sharp turn to the left. I was unable to keep it on the runway with full right rudder and braking and struck a sign along the side of the runway.
Smyth Sidewinder pilot reported losing directional control on the landing roll; departed the runway; and struck a sign.