2 ms·
A sailboat uses the speed difference between the water (basically stationary) and the wind. A bird (or sailplane) just moves along with the wind. Birds and sail
by HPsquared 3y ago
A sailboat uses the speed difference between the water (basically stationary) and the wind. A bird (or sailplane) just moves along with the wind. Birds and sailplanes can however hang around areas of rising air to overcome their natural sink rate.