1. Also, the J65 engine continued to suffer from flameouts when flying through heavy rain or snow.

2. The YJ65-W-1 engine was considered obsolete and the improved J65-W-3 did not become available until 1954.

3. Meanwhile, the J79 engine was not ready; both prototypes were instead designed to use the Wright J65 engine, a licensed-built version of the Armstrong Siddeley Sapphire.

4. Wright had subcontracted production of J65 engines to Buick, which resulted in slow deliveries and a tendency for engine oil to enter the bleed air system, filling the cockpit with smoke.