One of the last aircraft proposed by the Curtis-Wright company (early 1960’s), this version of the Model 300 featured a single main wing with wingtip engine pods. Each pod contained to Wankel rotary internal combustion engines; each engine drove a broad-bladed propeller (one at the front of the pod, one at the rear) of the type that had been successfully demonstrated on the Curtis-Wright X-19 VTOL aircraft. In order to attain vertical lift, the forward propeller would tilt up, the aft propeller would tilt down.
At the time, there was considerable interest in fast short-ranged VTOL transport. The idea was that small VTOL aircraft would operate from various small “ports” in and around major cities, flying to and from the nearest major airport (along with other transportation hubs). The VTOL would provide a bus service for the busy businessman on the go, who might need to leave his office in a hurry and catch the next jetliner to, say, London. While no VTOL aircraft such as the Model 300 were built and put into service for this role, several attempts to fill the “VTOL bus” role were attempted with helicopter, but due to noise and cost the concept never caught on.