Hi Gareth
The Rosburg crash was indeed caused by intake momentum drag, which also claimed several other victims and sundry near misses in the early days. The great saviour was a simple windvane which stood on a little pole just infront of the cockpit. If you started running out of aileron authority it was time to put in a boot of rudder and formate on the windvane. We later got some rudder pedal shakers and later some auto-stabilisers but nothing was as good as the old windvane. Mind you that was in the days when we were able to fly the jet without the hindrance of a two-seater or a flight simulator!
PS Thanks for digging out my book! Lots of history on this thread, not just in the lst 19 years since I wrote it, but in the 38 years(!) since I first flew it...
Best wishes all
MS