You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What engine was used in the aircraft intended to replace the F4F Wildcat?" whose answer is Pratt & Whitney R-2800 Double Wasp engine.
Each document should contain about 30 words, and these documents should contain useful information.

Query: engine used in the F6F Hellcat
Useful Output:

Doc 1: The Hellcat was fitted with three self-sealing fuel tanks: one with a capacity of 60 US gallons (227 liters) under the pilot's seat, and one in each wing with
Doc 2: The obvious answer was Pratt & Whitney's magnificent new 2,000-hp R-2800. A turbocharged R-2800 was mounted on the prototype, which became the
Doc 3: The Hellcat was a rival to the Vought F4U Corsair and had more aerial victories and participated in more missions. The F6F was equipped with Browning Machine
Doc 4: Brand: Quickboost ; Title: Grumman F6F Hellcat - Engine for Academy ; Number: QB 72 040 ; Scale: 1:72 ; Type: Detail set
Doc 5: Initially, the Hellcat was designed to use the Wright R-2600 Twin Cyclone radial engine (1,700 horsepower). However, Grumman later changed