One of the most notable changes made to the Thunderbolt during the course of production was the installation of a 360 degree, all-round view "Bubble Canopy". This was achieved by removing the upper part of rear section of the previous type called "Razor Back", and this change was so advantageous in the visibility afforded the pilot. Originally it was intended to introduce this improvement with a new model designated P-47L, but in the event, decided to continue the P-47D series and the introductions were made with the P-47D-25 from Farmingdale and the P-47D-26 from Evansville.
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