My pleasure, Jim. By all means please implement the arm. Here in the U.S. we typically use this method over spools. It is much more efficient and easier to work with.
Make sure you have a strong enough servo to handle the load. At the same time please also be sure to set the arm properly to allow the correct amount of "swing." It will take some trial and error to set the gear on the servo under the arm just right. Doing so will insure proper distance between close haul and a run.
Also, I have a bad back, and so do most of my friends who also sail their model boats with me here in Concord, Ca. I am the Secretary of our model club, the Concord Model Engineers. Anyway, you can fabricate a simple boat carrier for the Atlantis using seat belt material, or a wide nylon type belt. Simply connect two belts together. With a friend on the other end you can launch the boat a little easier.
Enjoy your Atlantis!
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