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Hartzell Propellers – Leading Since 1917

4 Jun 2019

 

Hartzell Propeller have been at the forefront of aircraft propeller design and manufacturing since the early days of aviation. In fact, our history dates back to 1917, after Orville Wright suggested Robert Hartzell start manufacturing hand-carved propellers from his walnut wood factory. Aviation has come a long way since the Wright Brothers first took to the skies in 1903. Just as aircraft design has progressed since the beginning of powered flight, aircraft propellers have transformed, too.

The first versions of the propeller were derived from a rotating screw design, which was first invented by the ancient Greek scientist Archimedes in 200 BC. These early screws were used by ancient civilizations to lift water from wells with much less effort. In the mid-1400s, Leonardo da Vinci reimagined the screw concept for a different purpose: a flying machine. Sketches of his first helicopter design (which he never built) include an upward-facing “air screw” that he believed would lift off the ground with enough rotation.

By the mid-1700s, inventors were using the rotating screw design as a means to propel boats and ships through the water. Marine propellers with multiple blades soon became standard technology on a variety of different vessels, and variations of the screw design are still used to this day.

Soon after the first hot-air balloon flight in 1783, inventors began to experiment with methods of propelling and controlling both lighter-than-air and heavier-than-air aircraft. Jean Baptiste Marie Meusnier envisioned an enormous airship that was to be driven by three hand-cranked propellers, though his design was never built. In 1852, Jules Henri Giffard invented the first full-size powered airship, which used a three-bladed propeller paired with a 3-horsepower steam engine. And in 1873, aviation pioneer Alberto Santos-Dumont built steerable aluminium airships powered by large wooden propellers.

Jules Henri Giffard

Over the next few decades, numerous heavier-than-air flying machines were designed and built using propellers based on the screw-shaped design. However, it wasn’t until the early 1900s that the first successful airplane, and the first successful airplane propeller, finally came to fruition, thanks to the Wright Brothers. Using data from their innovative wind tunnel tests, the Wrights realized that aircraft propellers should be shaped more like a wing, or aerofoil, as opposed to a screw. They found that propeller blades act much like a rotating wing, but instead of creating lift, the spinning blades displace air backward to produce forward thrust. The Wrights also came up with the idea of adding a twist along the length of each propeller blade, which gave the blades a more consistent angle of attack with each rotation.

The first propellers were made from wood and were fixed pitch, which greatly limited the performance capabilities of the aircraft. In 1929, Wallace Turnbull patented his design for a variable pitch propeller, which allowed the pilot to manually adjust the blades’ pitch and maintain better control over the aircraft’s performance and operational efficiency.

Later, constant-speed propellers were developed, which are variable pitch propellers that adjust pitch automatically to maintain a constant rotational speed. Most of today’s high-performance propeller aircraft use constant-speed props because they offer better performance and fuel efficiency.

 

After the Wright Brothers’ breakthrough design in 1903, propeller technology advanced rapidly. While the Wrights’ propellers were about 82% efficient, today’s propellers operate at around 90% efficiency. Modern propellers are made from aluminium or composite materials and range from two to eight blades.

 

Robert Hartzell grew up in the village of Oakwood, Ohio just a block from Hawthorn Hill, where Orville Wright lived. From the 1890s until the late 1910s, Hartzell's father and grandfather operated a sawmill and lumber supply company in Greenville, Ohio that also manufactured items like wagons and gun stocks for World War I. On the side, Robert owned a small airplane and did maintenance on it as a young man. In 1917, Orville Wright suggested that Hartzell use his walnut trees to manufacture an aircraft propeller for his plane and others. As a result, Robert Hartzell founded the Hartzell Walnut Propeller Company in Piqua that same year, and the company provided "Liberty" aircraft propellers for World War I warplanes.

After the war, Hartzell Propeller built its own airplanes, including the FC-1 (the first aircraft made entirely of plywood). The FC-1 took first place in the Flying Club of St. Louis Trophy Race at the 1923 International Air Meet. An alteration to the wings resulted in the improved FC-2 model, which won over aircraft from the Waco Aircraft Company and the Curtiss Aeroplane and Motor Company) at the 1924 International Air Races in Dayton, Ohio. Hartzell stopped producing aircraft to avoid competing with its own propeller customers. In 1926, Hartzell began building propellers for the Aeronca C-2.

 Hartzell FC-2

During World War II the company produced metal propellers for Hamilton-Standard. After the war, Hartzell produced the first composite propellers for the Republic RC-3 Seabee. Hartzell began making aluminium propellers in 1948 and developed the first full-feathering propellers for a light twin-engine aircraft in the 1950s. These were used in the Aero Commander, Piper Apache, Cessna 310, and Beech Twin Bonanza.

Hartzell introduced a turboprop propeller in 1961 and in 1975 certified a 5-bladed propeller for the Shorts 330. In 1978, the company produced a composite aramid fibre propeller for the CASA 212. In 1989, Hartzell produced sixteen-foot propellers for the Boeing Condor, another record-breaking aircraft. Hartzell introduced Top-Prop, replacement propellers for piston-engine aircraft, in 1991, and sold 20,000 Top-Prop conversion kits from 1991 to 2013.

In 1994, the company held the first Friends of Hartzell Air Show in Piqua, Ohio. for which Hartzell developed its first aerobatic system. In 2013, the Red Bull Air Race World Championship chose Hartzell to provide 3-blade composite propellers, carbon fibre composite spinners, and governors to race teams. In 2006, the FAA granted Hartzell the first certification for an Advanced Structural Composite (ASC II) propeller for general aviation.

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