When I flew the prototype Optica at Farnborough with Angus McVitie, we used about the same amount of runway for takeoff that something like a C150 would ie not much; certainly we were able to get to 500ft and turn south well before the end of the runway. Angus did the actual takeoff then handed over to me when we had positive rate of climb and we floated down towards Sands at a leisurely 80kt ias. In the vicinity of Waverley Abbey, Angus lowered the flaps and invited me to shut the throttle; there was enough residual thrust from the fan to maintain about 40-45kt ias, and the handling was reminiscent of a T21 but I do recall any change of thrust meant re-trimming too. On return to Farnborough, Angus let me land it - once again similar to a C150 - and we vacated at the 'arrestor' runway (taxiway C nowadays) after I put it on the runway 25 (24 nowadays) numbers.