Mario, not sure where you are coming from but the Hassocks Hog flipper calculator is a very useful modelling tool, modelling is used throughout everyday life so why not flippers. I like others who have used it have found it to be very good. Your 7 years of experience is personal to you whereas the calculator is freely available to all. Dont use it if you dont want to but equally dont knock something that others find useful. This thread is titled FP HW tips and the calculator is a great tip for builders trying to work out their fliiper geometry.

Dave, M2XT used an analogue output (2-20mA) pressure transmitter, this fed into a comparitor (PICAXE) where the pressure was compared to that of a signal direct from a Rx. The ouput of the comparitor was used to drive a HP solenoid valve which opened to pressurise the buffer tanks at a controlled rate until the desired pressure was reached when it then closes again.