Question: How many cylinders were in the engine of 885 hp, late 1930's Rolls-Royce?
Context: The Rolls-Royce Peregrine was a 21 l , 885 hp liquid-cooled V-12 aero engine designed and built by the British manufacturer Rolls-Royce in the late 1930s.  It was essentially the ultimate development of the company's Kestrel engine, which had seen widespread use in military aircraft of the pre-war period. The Eagle Manufacturing Company of Appleton, Wisconsin first entered the farm equipment market in 1906 with a 32 hp tractor.  They returned to the marketplace several years later, in 1929 offering a 20-35 Model E. Based on a two-cylinder traction engine design, the engine measured 8.00x9.00 inches in bore and stroke.  A truly massive affair, it was rated at 20 drawbar horsepower and 35 belt-pulley horsepower.  Eagle also built its Model H alongside the Model E from 1926 to 1930.  With an identical 8.00 in bore to the Model E, but a 1.00 in longer stroke at 10.00 inches, the Model H created a brawny 40 hp at the drawbar.  Eagle was one of the first tractor manufacturers to use a 6-cylinder engine.  It switched from 2 cylinders to 6 cylinders in 1930. The Rolls-Royce 10 hp was the first car to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce, and badged as a Rolls-Royce.  The 10 hp was produced by Royce's company, Royce Ltd., at its factory in Cooke Street, Hulme, Manchester, and was sold exclusively by Rolls' motor dealership, C.S.Rolls & Co., at a price of GBP395.  The 10 hp was exhibited at the Paris Salon in December 1904, along with 15 hp and 20 hp cars and engine for the 30 hp models. The Rolls-Royce 15 hp was one of four cars to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce.  Badged as a Rolls-Royce, the 15 hp was produced by Royce's company, Royce Ltd., at its factory in Cooke Street, Hulme, Manchester.  It was sold exclusively by Rolls' motor dealership, C.S.Rolls & Co., at a price of GBP500.  The 15 hp was exhibited at the Paris Salon in December 1904, along with the 10 hp, 20 hp and engine for the 30 hp models, but as the new three-cylinder engine was not ready the chassis was incomplete. A V12 engine is a V engine with 12 cylinders mounted on the crankcase in two banks of six cylinders each, usually but not always at a 60° angle to each other, with all 12 pistons driving a common crankshaft.  Since each cylinder bank is essentially a straight-six which is by itself in both primary and secondary balance, a V12 inherits perfect primary and secondary balance no matter which V angle is used, and therefore it needs no balance shafts.  A four-stroke 12 cylinder engine has an even firing order if cylinders fire every 60° of crankshaft rotation, so a V12 with cylinder banks at a multiples of 60° (60°, 120°, or 180°) will have even firing intervals without using split crankpins. By using split crankpins or ignoring minor vibrations, any V angle is possible.  The 180° configuration is usually referred to as a "flat-twelve engine" or a "boxer" although it is in reality a 180° V since the pistons can and normally do use shared crankpins.  It may also be written as "V-12", although this is less common. The Rolls-Royce 20 hp was one of four car models to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce.  Badged as a Rolls-Royce, the 20 hp was produced during 1905 and 1906 by Royce's company, Royce Ltd. at its factory in Cooke Street, Hulme, Manchester.  It was sold exclusively by Rolls' motor dealership, C.S.Rolls & Co., at a price of GBP650.  The 20 hp was exhibited at the Paris Salon in December 1904, along with the 10 hp, 15 hp and engine for the 30 hp models. The Rolls-Royce 30 hp was one of four cars to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce.  Badged as a Rolls-Royce, the 30 hp was produced during 1905 and 1906 by Royce's company, Royce Ltd. at its factory in Cooke Street, Hulme, Manchester.  It was sold exclusively by Rolls' motor dealership, C.S.Rolls & Co., at a price of GBP 890.  The engine was exhibited at the Paris Salon in December 1904, along with the 10 hp, 15 hp and 20 hp models. The Rolls-Royce Hawk was a British aero engine designed by Rolls-Royce in 1915.  Derived from one bank of six cylinders of the Rolls-Royce Eagle, it produced 75 horsepower at 1,370 rpm.  Power was progressively increased to 91 hp by February 1916, and 105 hp by October 1918. The Rolls-Royce Buzzard (also referred to as the H engine) was a British piston aero engine of 36.7 L capacity that produced about 800 hp .  Designed and built by Rolls-Royce Limited it featured 12 cylinders in a 'V' configuration of 6 in bore and 6.6 in stroke.  It was manufactured in the late 1920s, but only 100 were sold.  A further development was the Rolls-Royce R Schneider Trophy engine.  The Buzzard was developed by scaling-up the Kestrel engine in the ratio of 5:6. The Pratt & Whitney R-2060 Yellow Jacket was a liquid-cooled aircraft engine project developed for the United States Army in the early 1930s.  The engine had five banks of four in-line cylinders, and displaced 2,060 cubic inches.  Designed to produce 1,000 hp, the engine produced 1,116 hp on its final run after 35 hours of testing.  The engine was cancelled in favor of continuing development of Pratt & Whitney's air-cooled R-1830 Twin Wasp radial engine.
Answer: 12 cylinders