During the mid 90's I recall working with a Mr Norman whose father, Desmond, was then working on something that he best described as a 3 engined Shed360 type aircraft.
Clark-Norman Triloader proposal for a 3 engined transport aircraft With an engine configuration almost identical to that of the Trislander but with three 45kW(600 hp) turboprops. Preliminary performance figures indicated a take-off run at sea level of just 740 ft (225m); long-range cruise speed of 155kt (290 km/h); and a range of 580 km (315 nm) with a payload of 3,000 kg. The large hold could have accommodated up to five LD3 containers. Side doors were proposed for palletised cargo and a front-loading door for containers and bulky goods. Wingspan was 24.4m and length 19.05m.