Only my two cents in addition
The false keel was mainly to protect the keel from physical violence / damage - means damages caused by running aground or touching a reef etc.
So a wear and tear part
If the keel was damaged, the ship was more or less a total loss, but the false keel could me removed and repaired.
shoe maybe it was like a slipper house shoe ......
Very informative page:
The entire keel structure is actually made up of several layers of wood. They are (from bottom to top, starting above the keel block in the illustration below): 1) The white oak keel, which projects from the bottom of the vessel; 2) The live oak V-shaped floor timbers, which sit directly on top of the keel and are the beginning timbers for the ship’s frames; and 3) The white oak keelson that sits on top of the floor timbers, which on Constitution is actually made of two timbers–the keelson and upper keelson. Protecting the keel from physical damage is the sacrificial “false keel.” This six-inch layer of white oak is attached to the bottom of the keel and acts like a bumper, taking the impact if the ship runs aground. When Constitution ran aground off the south coast of England in January 1879, the false keel performed exactly as intended. Eighty-five feet of the false keel ripped away as the ship was released from her grounding, with no damage to the actual keel. Together, these layers of white and live oak measure about six feet high for the entire keel structure.
On Saturday last [May 16, 1795], the keel of the United States frigate [Constitution]…was finished laying. It is 156 feet in length, and from the. . .
ussconstitutionmuseum.org
BTW: also interesting is the fact, that either the fasle keel was extra sheated with copper, with a own row of sheating - this was also for easier repair
View attachment 406733
View attachment 406734
View attachment 406735
Editor’s Note: On May 10, 2022, Naval History and Heritage Command began commemorating the 225th anniversary of the launch of the first of the U.S. Navy’s six frigates (United States), which began the
usnhistory.navylive.dodlive.mil