The one and only prototype Cessna 620 executive aircraft concept
As far as I’m concerned, the Cessna 620 was doomed from the start… you needn’t go any farther than the name: Cessna six-twenty? It just doesn’t roll off the tongue like it should. It’s kinda like the Infinity QX56 I saw the other day. QX fifty-six? What the heck?
Actually, the Cessna 620 is a pretty interesting airplane, and had it not been for the fact that airlines in the late 50’s were rapidly switching to jet aircraft, the 620 might have had a real opportunity to make it in the biz-prop marketplace. As it turned out tho, when the airlines started dumping their twin-engine, 40 seat Convair 240/340 and Martin 4-0-4 aircraft, it just didn’t make much sense for a corporate operator to spend more money on a new airplane that could only carry 10 bodies. That economic reality seems to be the pivot point for pulling the plug on the 620 in 1957 after only one prototype was built and flown. It’s good to note tho that it appears the airplane performed well and lived up to Cessna’s design goals.
With power coming from 4 Continental engines producing 350 hp each, the aircraft was expected to be able to cruise at about 250 mph. However, the care and feeding of those 4 engines also seems to be a pretty big disadvantage. Especially since more powerful and more reliable turboprop engines were just a handful of years away from reaching the marketplace on twin-engine airplanes like the Beech King Air.
But still, like many other research projects from the past, the Cessna 620 is a really interesting part of aviation history. And while there doesn’t seem to be any real connection between the 620 and the 310 (except the look of those snazzy tip tanks) I do think that the big 4-engine beast might have been useful as a mower for airports with large grass runways… umm, excuse me, can we get a little more ground clearance here please!
Cessna 620: 4 engines and 10 seats