With the page turned vertically, there are two separate studies of yachts manoeuvring at speed. The one at the top is comparable with those on the left of the oil Sketch for ‘East Cowes Castle, the Regatta Beating to Windward’ No.3, of 1827 (Tate N01993).1 For more on studies in this sketchbook relating to the regatta events at Cowes from late July 1827 onwards, see the sketchbook Introduction.
The marks beside the lower boat appear to form a slight continuation from the horizontal view on folio 23 verso opposite (D18033).
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, p.160 no.262, pl.267 (colour).