In, 1938 the U.S. Navy placed a contract with the Bell Aircraft for a navalized version of the P-39 fighter. Changes included a tailwheel undercarriage, installation of an arrestor hook, enlarged vertical surfaces and restressing for carrier operations. The Navy lost interest in the project and only one prototype was constructed.
Link:
http://www.deviantart.com/submit/deviation?deviationId=198015906
This piece was created in Illustrator CS and is entirely vector.