I certainly remember the 'Robinson Loop', Charlie Juliet, having instructed in its' execution from the rear seat on 228 OCU. We taught it for a few years in the early 70's until the pieces of wing panel started parting company. Close scrutiny of the newest copy of the R to S revealed that we had been exceeding the rolling G limits by a fair margin!
Can't say I was disappointed at not teaching it any more - it was more than a bit tricky to stay awake in the pit whilst someone else was pulling 8.5G.