Proposal display of the CL-303, made by the Lockheed model shop in Burbank, late 1954. As far as I know, this was the only model of the CL-303 ever made. After American Airlines rejected it in favor of a larger airliner, Lockheed went to work on the CL-310 (basically the same general arrangement, but with a low wing) and the CL-303 was shelved. American Airlines ordered 35 CL-310s in June, 1955, which soon became known as the Lockheed Model 188 Electra.
Competing with the CL-303 contract for American Airlines was the Douglas Model 1867J (a turboprop-equipped DC-6). For picture of the 1867J, go here:
https://www.secretprojects.co.uk/forum/index.php/topic,5101.msg222911.html#msg222911. The 1867J was also rejected by American Airlines and quickly forgotten.
Perhaps a moderator would like to simplify the title of this thread to
Lockheed CL-303. I will post the patent drawing and Orionblamblam has already posted a reasonably legible 3-view drawing with dimensions. Those should suffice. Of course, if someone here has the original Lockheed factory drawings for the CL-303, please send me a PM.
