flow velocity 38 this passive dive occurs in order to avoid high loads and over speeding of the rotor 14 that will come with higher flow speeds the productivity advantage is that the platform 25 will be operating at design generating capacity for most of the time maximizing productivity without overloading the system the platform 25 will continue to dive until it has obtained the design flow speed resulting in steady level flight the forces shown in fig9 depict how the flow velocity affects the platform 25 in the three scenarios of fig1 the buoyant force 42 of the platform 25 is always constant as per the design requirements in a high velocity profile 57 negative wing lift 44 platform drag 40 and forward mooring line tension 41 all increase the increase in downward force from negative wing lift 44 along with operating rotor drag load cause the platform 25 to passively dive deeper to seek a state of equilibrium in a low flow velocity profile 55 the vertical mooring line 43 will be in full design tension and the negative wing lift 44 decreases with this profile the buoyant force 42 of the platform 25 will exceed the downward negative wing lift 44 acting on the platform 25 and will cause the platform 25 to rise closer to the water 39 s surface 50 the platform 25 will never be able to reach the water 39 s surface 50 while in service due to the restrictive vertical mooring line 20 when maintenance on the platform 25 must be performed the rotors 14 will be stopped creating a significant drop in platform drag 40 when the platform 25 has risen to the extent of the vertical mooring line 20 it can be disconnected and will then.