I came cross this nice looking Dc-4 from 1939 when it had triple tail design
https://www.flickr.com/photos/…ives/4590435072?ytcheck=1
this web site that a picture
https://www.flickr.com/photos/twa1049g/8116124017/
here is picture of the tail of plane.
here is the DC-4 prototype in flight
http://www.stinsonflyer.com/prop/dc4e-04.jpg
here is some info on the plane
http://blog.jetsettingmagazine…gest-aircraft-at-the-time
With a planned day capacity of 42 passengers (13 rows of two or more seats and a central aisle) or 30 as a sleeper transport (like the DST), the DC-4 (as it was then known) would seat twice as many people as the DC-3 and would be the first large aircraft with a nosewheel. Other innovations included auxiliary power units, power-boosted flight controls, alternating current electrical system and air conditioning. Cabin pressurization was also planned for production aircraft. The novel tail with three low vertical stabilizers enabled use of existing hangars and provided sufficient vertical fin area to allow the aircraft to take off with only two engines on one side operating. The wing planform was similar to the DC-3, with a swept leading edge and almost straight trailing edge. The four 1,450 hp (1,080 kW) Pratt & Whitney R-2180-A Twin Hornet 14-cylinder radials were all mounted with noticeable toe-out, particularly the outer pair
