13.jpg Back at the main site with Derk ready to flyThumbnailsTeam practiceBack at the main site with Derk ready to flyThumbnailsTeam practiceBack at the main site with Derk ready to flyThumbnailsTeam practiceBack at the main site with Derk ready to flyThumbnailsTeam practiceBack at the main site with Derk ready to flyThumbnailsTeam practiceBack at the main site with Derk ready to flyThumbnailsTeam practiceBack at the main site with Derk ready to flyThumbnailsTeam practice