Hornsby Akroyd oil engines
The Hornsby Akroyd oil engine stands as a remarkable testament to the ingenuity of engineering history, showcasing a pivotal moment in the evolution of power generation.
This groundbreaking invention serves as a vital link between the early steam power era and the sophisticated diesel engines we recognize in the modern age.
While Rudolf Diesel is frequently celebrated for his revolutionary contributions to engine technology, it is crucial to acknowledge that Herbert Akroyd Stuart’s "hot
bulb" engine had already been delivering dependable industrial power several years prior to Diesel unveiling his first operational prototype.
This early engine technology not only laid the groundwork for subsequent innovations but also validated the practicality of using heavy oil as a viable fuel source.
Delving into the mechanics of the Hornsby Akroyd oil engine underscores its significance and the inventive nature of its design philosophy.
Herbert Akroyd-Stuart was born on January
28, 1864, in Halifax, Yorkshire, England. A pivotal moment in his illustrious
career unfolded in 1885 when he inadvertently spilled oil into a pot of molten
tin. The oil rapidly vaporized and ignited, sparking his fascination with the
concept of an engine powered by oil vapor. This serendipitous incident
ultimately led to his patent application (No. 15,994) on October 8, 1890, which
detailed an innovative engine design that introduced air and fuel in a separate
manner. The Hornsby–Akroyd engine functioned as a
vaporizing oil engine that utilized a hot bulb or vaporizer for the ignition
process. To initiate the engine's operation, the vaporizer was heated with a
blowtorch, which allowed the heavy oil to vaporize effectively before it was
mixed with air. Remarkably, the combustion heat produced by the engine itself
was sufficient to maintain the vaporizer at the required temperature for
continuous operation. During the compression stroke, oil was injected into the
vaporizer, where it blended with air and ignited almost instantaneously,
driving the piston down the cylinder with considerable force.
How the "Hot Bulb" Engine Works
The operation of this engine and the
reasons for its groundbreaking influence on the industry are noteworthy.
The genius of the Hornsby–Akroyd design lies in its
impressive simplicity. In contrast to modern gasoline engines that depend on
spark plugs for ignition, the Hornsby–Akroyd engine
functions without these components. It also does not need the high-pressure
fuel injection systems typical of today's diesel engines. This uncomplicated
design not only facilitated easier manufacturing but also enhanced its
reliability and ease of maintenance. By removing intricate parts, the engine
demonstrated effective performance in various conditions, highlighting the
creativity of its inventors.
The Combustion Cycle
1.
Pre-heating: The operation of
the engine commenced with a technician utilizing a blowtorch to heat the
"vaporizer," which is the cast-iron bulb located at the end of the
cylinder. This vital step involved heating the vaporizer until it glowed red
hot, ensuring that it could effectively vaporize the heavy oil. The pre-heating
process was critical for initiating the combustion cycle, as it prepared the
engine for the subsequent stages. By achieving this high temperature, the
engine set itself up for efficient operation, demonstrating a clever use of
thermal energy. The technician's skill in this step was essential, as it
directly influenced the engine's performance.
2. The
Intake Stroke: During this phase, as the piston moved away from
the cylinder head, it created a vacuum that drew in pure air from the
surrounding environment. At this moment, a pump also injected a small quantity
of heavy oil into the hot vaporizer. This simultaneous action ensured that the
air and oil were properly mixed, setting the stage for combustion. The careful
timing of these actions was crucial for maintaining optimal engine performance.
This intake process exemplifies the engine's clever design, as it effectively
utilized both air and fuel to prepare for ignition.
3. The
Compression Stroke: Following the intake, the piston then moved
back toward the cylinder head, compressing the fresh air that had been drawn
into the vaporizer. This compression was essential as it raised the temperature
and pressure of the air, allowing for more efficient combustion.
The design of the engine facilitated this process, emphasizing the
importance of compression in the ignition cycle. This stage showcased the
engine's ability to harness physical principles to maximize its performance,
highlighting the engineering prowess behind its creation.
4. Ignition:
As the piston reached the end of its compression stroke, the air that mixed
with the oil vapor in the red-hot bulb reached its flashpoint. At this critical
juncture, an explosion occurred, propelling the piston back down the cylinder
with significant force. This explosive reaction was the driving force behind
the engine's operation, converting thermal energy into mechanical work. The
ignition process not only illustrates the effective use of oil vapor but also
underscores the innovative nature of the Hornsby–Akroyd
design. It was this unique ignition method that distinguished the engine from
its contemporaries.
5. Self-Sustaining
Heat: Once the engine was in full operation, the heat generated
from each explosion was sufficient to keep the bulb hot, enabling it to ignite
the next charge of air and oil. This self-sustaining mechanism allowed the
operator to turn off the blowtorch after the engine had started, demonstrating
the efficiency of the design. The ability to maintain combustion without
external heat not only simplified operation but also contributed to the
engine's reliability. This feature was particularly advantageous in industrial
settings, where consistent performance was paramount.
Akroyd-Stuart vs. Rudolf Diesel
The
history of the heavy oil engine often leads to debates over who should be
credited with its invention. While both Herbert Akroyd-Stuart
and Rudolf Diesel experimented with similar fuels, their methods and
technologies were distinctly different. The following comparison highlights the
key features that set their engines apart:
Feature
Hornsby–Akroyd (1890) vs Diesel
Engine (1892/1897)
Ignition
Method External heat source (Hot Bulb) Heat of high
compression
Fuel
Delivery Low-pressure
spray into vaporizer vs High-pressure
injection
Efficiency
Lower
(but very reliable) Higher (but more complex)
Maintenance Very low;
"bulletproof" design vs Required precision engineering
Legacy and Impact
The
success of the Hornsby–Akroyd engines was truly
remarkable for their time. By the time Richard Hornsby & Sons ceased
production, these engines had been deployed across various domains, showcasing
their versatility. They were instrumental in operating:
·
Lighthouses: The exceptional
reliability of these engines made them ideally suited for powering lighthouses,
particularly in remote coastal areas where consistent power was essential.
· The Statue of Liberty: A
Hornsby–Akroyd engine was responsible for providing
electricity for the statue's first lighting system, marking an important
historical application of this technology.
·
Military Tractors: Over time,
the advancements derived from these engines contributed to the development of
the first tracked "caterpillar" vehicles, revolutionizing military
transportation.
The
Hornsby–Akroyd engine was particularly notable for
its reliability, as it could operate efficiently on nearly any combustible
liquid, including heavy crude oils that would have caused significant issues
for more delicate engines of that era. This adaptability not only underscored
its innovative design but also highlighted its practical applications in
diverse industrial settings.
The
Hornsby–Akroyd oil engine, invented by Herbert Akroyd-Stuart, was the first successful design of an
internal combustion engine that effectively utilized heavy oil as fuel, and it
achieved immediate success upon its introduction.
These
early Hornsby engines were remarkably successful, with over 32,417 vertical and
horizontal engines produced over a 20-year period, a staggering achievement
considering that Dr. Rudolf Diesel had yet to build a single engine at that
time.
Despite
the advancements made by Diesel, the Hornsby–Akroyd
engine remains an important milestone in the history of internal combustion
engines, illustrating the innovative spirit of its inventor and the profound
impact it had on industrial power generation.
https://www.agrimanuals.com/ruston--hor
https://www.scribd.com/document/351264048/diesel-engine-manual
6PB manual
https://collection.sciencemuseumgroup.org.uk/documents/aa110071075/ruston-hornsby-ltd-drawings
https://www.stationaryengineparts.com/Stationary-Engine-Colours/
https://www.ebay.co.uk/b/bn_7024773926
https://www.engineersaustralia.org.au/sites/default/files/2022-10/eha-magazine-v4-1.pdf
https://heritagemachines.com/restorations/richard-hornsby-traction-engine/
https://www.agrimanuals.com/steam-engines-and-traction-engine-books-389-c.asp
https://www.agrimanuals.com/ruston--hornsby-engine-manuals-240-c.asp
SA
https://visitcoppercoast.com.au/farm-shed-museum?satcMcId=57994931573662167747978708078606479228
nsby-engine-manuals-240-c.asp
but we may recall that they are differentiated from those of other makers by the fact that there is no separate vaporiser and no ignition tube.
The oil is injected directly into the combustion chamber, and is immediately flashed into vapour, exploding spontaneously when the compression attains its maximum. The result is that great simplicity of construction is attained. The governor reduces the supply of oil, as the demand for power falls off, but does not cut it off completely, as in the hit-and-miss arrangements. More regular turning is thus secured.
These engines are now constructed from 14 up to 25 brake horse-power, as single cylinder engines, and up to 50 horse-power, with two cylinders. They will run with oil varying from a specific gravity of .8 to .880.
Summary
Portable single-cylinder oil engine. Made by Richard Hornsby & Sons, Grantham, Lincolnshire, England, serial no.1887 of circa 1896-97.
This early hot-bulb assisted compression ignition internal combustion engine design used kerosene as a fuel source and was one of the first forms of internal combustion power available to Australian farmers. Originally developed by the Yorkshireman Akroyd Stuart and patented in 1890, the design was produced under licence as the 'Homsby-Akroyd', from 1892, pre-dating by several years the sparkless compression ignition design credited to Rudolf Diesel, of Germany.
This example was delivered to the Melbourne agency of R. Hornsby & Sons, in June 1897. It was acquired by the former Museum of Applied Science (now part of Musuems Victoria), from Mr G. Main, of Malmsbury, in 1959, being the first historic farm engine collected by the museum. It was externally statically 'restored' and repainted by Vivian Expositions Pty Ltd, of Clifton Hill, prior to first going on display in March 1970.
Physical Description
Portable single cylinder, oil engine, attached to a base with four metal wheels.
More Information
Collecting AreasEngineering, Sustainable Futures
Acquisition InformationPurchase
ManufacturerRichard Hornsby & Son, Grantham, England, Great Britain, circa 1896
Brand NamesHornsby Ackroyd (Oil Engines)
ClassificationMechanical engineering, Internal combustion power, Oil engines
CategoryHistory & Technology
DisciplineTechnology
Type of itemObject
Overall Dimensions2400 mm (Length), 1500 mm (Width), 1600 mm (Height)
KeywordsAgriculture, Internal Combustion Engines, Oil Engines
The earliest mention of an oil engine was by Robert Street, in his English patent no. 1983 of 1794, and according to Horst O. Hardenberg there is evidence that he built a working version.[1][2] Other oil engines were subsequently built by Etienne Lenoir, Siegfried Marcus, Julius Hock of Vienna and George Brayton in the 19th century. In 1807 Nicéphore Niépce built a working moss and coal powder powered engine. the Pyreolophore, which powered a boat upstream on the River Saône. All of these engines with the exception of Brayton's were non-compression.
Others made refinements to the oil engine; William Dent Priestman[3] and Emile Capitaine[4] are some of the more notable. However, it was Herbert Akroyd Stuart's design that was the most successful.
Herbert Akroyd Stuarts engine
Diagram of early vaporizing oil engine
Herbert Akroyd Stuart's first prototype engines were built in 1886. In 1890, in collaboration with Charles Richard Binney, he filed Patent 7146 for Richard Hornsby & Sons of Grantham, Lincolnshire, England. The patent was entitled: "Improvements in Engines Operated by the Expl
Hornsby–Akroyd oil engines
Herbert Akroyd-Stuart
Born 28 January 1864
Halifax, Yorkshire, England. Inventor Hornsby–Akroyd oil engine,
First successful design of internal combustion engine using heavy oil as a fuel.
Herbert Light globe moment came in 1885,when he spilt oil into a pot of molten tin.
The oil vaporized, and burst into flame. Straight away, he began to think about an engine to operate on oil vapour. Leading to taking out patent (No.15,994) 8 October 1890
Detailing an engine where air and fuel are introduced separately.
The Hornsby–Akroyd oil engine, was the first successful design of an internal combustion engine using heavy oil as a fuel. was an immediate success
The Hornsby are vaporizing oil engines, in that they use a hot bulb (vaporizer) for ignition
To start, the "bulb" or vaporizer was heated with a blowlamp, vaporized the heavy oil into gas prior to mixing it with air. The engines own combustion heat is sufficient to maintain a hot bulb vaporizing the heavy oil.
On compression stroke when oil is sprayed into the vaporizer combines with air.
Immediately ignite, propelling the piston back again.
These early Hornsby were so successful more than 32,417 engines (vertical and horizontal) were produced over a 20 year period. before of Dr Rudolf Diesel, had built a single engine.
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