I have installed this very fine aircraft , but it has a major problem . As soon as the sim starts, the tail skid collapses into the ground and the aircraft crashes. By slewing it up straight away you can get it into the air where it flies with a heavy tail.

I have experienced this before and was able to solve it by playing with the Centre of gravity positions in the aircraft file. I have moved the centre of gravity forward in this aircraft file, but the tail still collapses

I have forgotten the detail of how to sort  this and this strangely this aircraft crashes the FSEdit program when you try to open it up. Any ideas anyone ?