STOL
For many years i operated a Robertson Stol C337 out of a 400m grass strip with trees at the end.
The system works just fine and made for a really useful machine which could carry its full payload and get out of anywhere.
The Robertson conversion was a properly engineered solution which included a drooped cuff on the wing leading edge,ailerons coupled to flap setting,wing tip extensions,vortice generators around rear engine,wing fences,improve gap sealing,and a flight manual supplement that actually mirrored the improved performance.
Cessna eventually incorporated the leading edge cuff on their production machines.
The machine never gave any trouble (other than the usual noise associated with the rear IO 360 Continental at fine pitch).and the max all up weight kept it out of 'euro charges' at the time.
It suited the 337 as there were no low speed issues as per a conventional twin in an engine out situation.
The handling was good and the machine a joy to fly from strips.