Forces on sails (3 m) = 5-m/s (≈10-knot) wind at 3 m above the water would be approximately "V" (15 m) = 6 m/s (≈12 knots) at 15 m above the water. In hurricane-force winds with "V" (3 m) = 40-m/s (≈78 knots) the speed at 15 m would be "V" (15 m) = 49 m/s (≈95 knots) with "p" = 0.128. This suggests that sails that reach higher above the surface can be subject to stronger wind forces that move the centre of effort ("CE" ) higher above the surface and increase the heeling moment. Additionally, apparent wind direction moves aft with
Scarlet Sails (tradition) of free entertainment provided by the city of St. Petersburg. Entertainment also includes appearances by popular rock-stars, as well as the St. Petersburg Symphony Orchestra, ballet and other classical acts, performing on several stages simultaneously during the event. The show also includes a series of large-scale events on the waters of the Neva River, such as rowing and motorboat races and a massive battle with pirates culminating in the appearance of a tall ship sporting spectacular scarlet sails. The show has become the main part of the White Nights celebration. The 1961 release of the film "Scarlet Sails" boosted the