I have constructed a wind tunnel with approximately 15 x 15 in. cross-sectional area test section. Where can i get some ideas/plans to build a simple force balance that can measure lift and drag forces simultaneously? Currently I'm using a single-axis button load-cell setup to measure drag. How to design a mounting solution for another load cell to measure the lift force? Or there are much better ways of doing this, e.g. using strain gauges? Need not be too accurate; this tunnel is intended for educational purposes only. Any help is appreciated, thanks.