A new model for Stanley in 1918, this Model 735, 7-passenger Touring Car has had at least six owners. In addition to the initial owner, records indicate that H.R. Zinn of New Jersey performed a major restoration of the car between 1950-52, which was featured by Popular Science Magazine in September of 1952. The current owner acquired the car in 1997, nearly a half century after its first restoration. A mechanical restoration was performed, followed by a complete interior and exterior renovation.
The Stanely Motor Carriage Company produced steam powered automobiles during the early 1900's. The automobile had just been created and many individuals and companies were experimenting with a wide variety of fuel sources, such as gasoline, electric, and steam. These three sources were the primary sources with each having benefits and limitations. The electric vehicles were limited on their range but they were clean, quiet and easy to start. The steam powered vehicles were also clean and quiet but they required a few minutes before starting to allow steam to form. The gasoline engine was noisy, dirty, and hard to start but showed the most potential. The advent of the electric starter around 1914 meant the demise of the other fuel sources.
Twins Francis Edgar and Freelan O. Stanley were born in 1849. Francis passed away in 1918 and Freelan survived until 1940. Their first glimpse of business ingenuity was shown at an early age when they opened a photographic dry plate business which they eventually sold to Eastman Kodak. They became interested in the horseless carriage and in 1897 had created their first automobile. The eventually sold the rights of their design to Locomobile.
The brothers produced steam powered vehicles from 1902 through 1917, known as the Stanley Steamers. Throughout the years the configuration of the vehicles, the complexity of the engines, and the mechanical components were all greatly improved.
The cars were simple yet complex, and rather ingenious. The frame was constructed of tubular steel and suspended by full-elliptic springs. Wooden bodies were built atop of the frames with a boiler mounted beneath the seat. A petroleum burner, later replaced by kerosene, was placed underneath the vertical fire-tube boiler and generated the steam. Piano-wire was used to reinforce the enclosure. By using piano wire, a low overall weight was maintained while increasing the structural rigidity of the boiler. The vertical fire-tubes were made of copper and later replaced with welded steel. A thick chain was connected from the engine crankshaft to a rear-mounted differential.
The boilers were made safe by incorporating certain safety valves that could be used to release pressure. Even with these safety valves, there was still concern of the boiler shell bursting. The boiler was made up of many joints and in the cases of excessive pressure, these joints would fail and release that pressure, extinguishing the burner, and subside the potential catastrophe.
The name 'coffin bonnet' was coined when the broiler was moved to the front of the vehicle, creating an appearance similar to other cars of the era. By moving it to the front of the vehicle, the noise generated by the boiling steam was slightly subsided for the passengers.
By 1917 the Stanley brothers sold their company to Prescott Warren who continued to build the steam powered car until 1927. The demise of the company was slow but much anticipated. The automobile was rapidly evolving while the Steamer was stagnate. Gasoline was inexpensive and reliable and more importantly, cheap. Steam powered cars sold for around $4000 while the Ford and Chevrolet, to name a few, were producing cars under $1000. Gasoline engines were increasing in size, capacity, and output while the steam cars hovered around 20 horsepower.
One of the most famous Steam powered cars is the Stanley Rocket which captured a land speed record for steam at 127.7 mph at the Daytona Beach Road Course. Driven by Fred Marriott, he easily secured the Dewar International Trophy awarded to the vehicle with the fastest measured mile time, which he accomplished in just 28.5 seconds.
The Stanley Rocket was designed to have limited drag. It was similar in shape to a canoe. It was long and narrow, at 16 feet long and 3 feet wide at its widest point. Most of the components of the car were housed within the body which increased aerodynamics. The 3.1 liter engine was a twin-piston double acting type that was capable of producing a reported 275 or 1000 psi at 700 degrees F. The entire vehicle weighed less than 1680 pounds.The Engine
The Stanley Steamers used water converted into steam to power the vehicles drive mechanism. What is generally not realized is that the boiler required fuel to generate the heat to make the conversion possible. The Stanleys fuel diet was flexible and able to except a variety of fuels to create the heat. Generally, the fuel of choice was hexane as the pilot fuel and kerosene as the running fuel. Other liquid fuels included gasoline, diesel, white gas and various soy fuels.
It is difficult to vaporize kerosene and a more volatile fuel source was needed, thus the hexane to ignite the kerosene used to heat the boiler. The hexane served as a pilot fuel that began the steaming process. Once the burner area was hot enough to vaporize the kerosene, the pilot fuel is turned off and the main fuel source is used. The kerosene would burn at a rate of about one gallon every 8-12 miles. Water had a broader range depending on if the car was a non-condensing or condensing. A non-condensing car went through a gallon of water ever one or two miles. A condensing car was higher, at about 8-12 mpg. The condensing cars reused steam. The non-condensing cars, the early Stanley Steamers, would discharge the used steam out of the car. This type of engine was simple, required few parts, and were not as prone to rusting as were the non-condensing cars.
Non-condensing Stanleys entered production around 1914, in response to customer's demands for greater MPG (water). The cars are distinguishable by their front-mounted radiator, similar to modern cars. The radiator would condense the steam and returned the water back to the water tank. This increased miles-per-gallon, but it introduced a slew of other problems due to the more-complex engine.By Daniel Vaughan | Jul 2007