This page lists thrust vs. power data for the following fans:-
WeMoTec MiniFan
WeMoTec MidiFan
WeMoTec HW-609 Fan
WemoTec HW-620 Fan
WeMoTec HW-730 Fan
WeMoTec HW-750 Fan
Note: The graphs show equations which can be used to predict the thrust for any given power input. Also note that the curves are second order polynomials which do not pass through the zero axis (to increase the accuracy of the curve fit) so the equations are invalid for very low power levels.