Welcome to The Sentinel Owners & Pilots Association. Celebrating our 20th year! We hope you enjoy your stay. If you have any questions or comments. don’t hesitate to contact us. If you are already a registered member of the Stinson L-5 Club / SOPA, don’t forget to sign in. Note – If you become lost inside this website, you can always come back to this MAIN PAGE by clicking or tapping the red Stinson L-5 Club title on the menu bar. Have fun exploring.