The poster that estimated a measurement from the plans gave that 550' apx. number and I believe it was Steve the moderator or someone else that gave the length of Maelstrom & Fiesta. They were around 750 to 850 ' ft. if my memory serves me correct. There's a lengthy discussion on the Avatar specifics thread. they get into water displacement & all kind of stuff relating to POC,, Lands and such also.