If you rely on my graph, then the maximum is about 2100 ft/min, and for the height (thickness) of the cloud layer 3000 ft (8000-5000) with a coefficient of 0.7, the desired thermal velocity is about 1500 ft/min.
Given the large number of dependencies for cloud thermals (coverage, dispersion, wind speed, temperature, precipitation, cloud layer height, cloud base height, and others), we want to see the right and beautiful clouds in good thermal weather and at the same time have the desired lift speed in the thermal. Moreover, over the sea, excluding the thermals of the earth and the elevator over the ridge. You need to fix all the dependencies.
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