Dragonfly airboat (model boat plan) (mar3103) freelance shallow draught ‘high speed ferry’ airboat. hull is 650mm length and 300mm beam, balsa and ply construction. Homemade boats from glen-l boat plans t hese photos are filed alphabetically by boat name. click on the name of the boat to see the photo.. Scheduled service on the st. petersburg-tampa airboat line in the winter of 1914 treated a passenger or two to a wooden seat, fresh florida air–and salt spray in the.