Looking at various contemporary inboard profile drawings, the Enterprize class shows none, while other larger ships inboard profile plans do show their location, number, siding, etc. If you look at the scantlings for floor and futtock riders in Steel's Elements and Practice of Naval Architecture and The Shipbuilder's Repository 1788 no ships of 44 guns or less had floor riders, or futtock riders. Barring better contemporary sources, it is probably safe to assume there were none on a small ship like Enterprize 1774.There is no indication of floor and futtock riders being used on Enterprize 1774,
Allan