This is what Contra-rotating propellers look like when messed up ...
A bit of 'stuff' on the Curtiss_XBTC below.
"The first Curtiss attacker proposal was the XBTC. The XBTC was a complicated design, using contra-rotating propellers and full-span duplex flaps. As originally designed, it had a payload of just 2,000lb, allowing for the carriage of a single torpedo. Testing began in January 1945, with tests finding that it had “first-class performance and weapon-carrying capacity.” Despite glowing reviews, it would not be selected for production, likely due to its technical complexity and the fact that the AM and BT2D (AD Skyraider) had already been ordered into production. Curtiss looked into de-navalizing the design under the designation A-40 for the USAAF, but these plans fell through after the USAAF announced that it would no longer acquire any more single-engined attackers."