Packard 1A-1500

Last updated
1A-1500
TypeLiquid-cooled V-12 piston engine
Manufacturer Packard
First run 1924
Number built29

The Packard 1A-1500 was an American 12-cylinder liquid-cooled 60-degree Vee piston aircraft engine designed in 1924. [1] Test flown in the second prototype Douglas XO-2 it proved to be unreliable. Only 29 engines were built.

V12 engine piston engine with 12 cylinders in vee configuration

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 60° 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.

Douglas O-2

The Douglas O-2 was a 1920s American observation aircraft built by the Douglas Aircraft Company.

Contents

Applications

Boeing Model 15 fighter aircraft family by Boeing

The Boeing Model 15 was a United States single-seat open-cockpit biplane fighter aircraft of the 1920s, manufactured by the Boeing company. The Model 15 saw service with the United States Army Air Service and with the United States Navy as a carrier-based fighter.

Boeing XP-4 fighter aircraft prototype by Boeing

The Boeing XP-4 was a prototype United States biplane fighter of the 1920s that was grounded permanently after just 4.5 hours of flight testing.

Curtiss Falcon 1920s multi-role combat aircraft

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Specifications (1A-1500)

Data from STATISTICS OF ALL THE AERO ENGINES OF PACKARD [2]

General characteristics

Components

Valvetrain mechanical system that controls operation of the valves in an internal combustion engine

A valvetrain or valve train is a mechanical system that controls operation of the valves in an internal combustion engine, whereby a sequence of components transmits motion throughout the assembly.

Overhead camshaft valvetrain configuration

Overhead camshaft, commonly abbreviated to OHC, is a valvetrain configuration which places the camshaft of an internal combustion engine of the reciprocating type within the cylinder heads and drives the valves or lifters in a more direct manner compared with overhead valves (OHV) and pushrods.

Performance

Power density is the amount of power per unit volume.

Power-to-weight ratio is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a vehicle as a whole, with the engine's power output being divided by the weight of the vehicle, to give a metric that is independent of the vehicle's size. Power-to-weight is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance.

See also

Comparable engines

Curtiss D-12 aircraft engine by Curtiss

The Curtiss D-12, sometimes identified with the military designation Curtiss V-1150, was an aircraft engine of 18.8 liter displacement. It was a water-cooled V12, producing 443 hp (330 kW) and weighing 693 lb (314 kg). It was designed by Arthur Nutt in 1921 and used in the Curtiss CR-3 for the 1923 Schneider Trophy race. Fairey Aviation of England imported 50 Curtiss-built examples in 1926, renaming them the Fairey Felix.

The Fairey P.12 Prince was a British experimental 700 hp class V-12 aircraft engine designed and built by Fairey in the early 1930s. The engine did not go into production.

Rolls-Royce Kestrel aircraft engine family by Rolls-Royce

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References

Notes

  1. ↑ Gunston 1989, p.109.
  2. ↑ Neal, Bob. "STATISTICS OF ALL THE AERO ENGINES OF PACKARD" (pdf). Aircrqaft Engine Historical Society. Washington D.C. Retrieved 20 January 2018.

Bibliography

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