Transcript PROPELLER DRIVEN VEHICLES

PROPELLER DRIVEN
VEHICLES
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What is a propeller?
• A propeller is a device
which transmits energy
by converting it into a
push for propulsion of a
vehicle such as an
aircraft, ship, or
submarine though a fluid
such as water or air, by
rotating two or more
twisted blades about a
central shaft.
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• The blades of a
propeller act as
rotating wings, and
produce a force that
pushes air or water in
one direction and the
object it is attached to
moves with equal
force but in opposite
direction.
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Phillips earned an 1852 patent for a "Steering Submarine Propeller,"
whose main innovation was a hand-cranked propeller on a swivel
joint that allowed crew to steer the vessel and control up and down
movement.
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The Helica was invented, developed, and manufactured by the
Frenchman Marcel Leyat, between 1913 and 1926. Thirty are said
to have been built, of which there were several. Certainly some
were built for sale, and two of these survive.
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An early Helica: 1913 design. This is a threewheeled two-seater. Note the complete
absence of any guard for the propeller; it is
difficult to believe this would have been streetlegal.
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1914 model, called "The Helicocycle" . This model has gained a wooden
shroud around the propeller, presumably for safety reasons.
There also appears to be a wire guard over the front of the propeller,
which is again two-bladed in this version. Still a three-wheeler.
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A surviving Helica: 1921 model. This four wheeled Helica
belonged to Gustave Courau. It was donated to the Museum of
the CNAM in 1931, and is on show in Paris. (CNAM =
Conservatoire National des Arts et Metiers) Note the propeller
is now four bladed, possibly to reduce noise and vibration.
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The only running Helica, seen under power at Goodwood racetrack
(Britain) in July 2003. This Helica is owned by Jean Francois
Bouzanquet of Paris. It was bought new by his grandfather in
1922, and it has been in the family ever since.
The engine is a British two-cylinder ABC of 1203 cc, driving a 4.5
foot diameter wooden propeller; maximum speed is about 60mph
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• Propellers on airplanes generally have
from two to six blades. These are usually
made of wood, aluminum alloy, steel, or
composite materials.
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The three-bladed propeller of a
light aircraft: the Vans RV-7A
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Propeller
• The Mini-Sniffer was a remotely controlled,
propeller-driven vehicle developed at the NASA
Flight Research Center as a potential platform
to sample the upper atmosphere for pollution. 13
• The vehicle, flown from 1975 to 1977, was one of the earliest attempts
by NASA to develop an aircraft that could sense turbulence and
measure natural and human-produced atmospheric pollutants at
altitudes above 80,000 feet with a variable-load propeller that was never
flight-tested.
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River boats also have been known for using a propeller to
move around water channels in the Everglades in Florida.
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Propeller driven
Sleighs
Made around 1912 .A speed of
60 mph is claimed.
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