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Saturday 5 March 2011

Motorcycle helmet rock,Part 1

Motorcycle helmet

A motorcycle helmet is a type of protective headgear used by motorcycle riders. The primary goal of a motorcycle helmet is motorcycle safety - to protect the rider's head during impact, thus preventing or reducing head injury or saving the rider's life. Some helmets provide additional conveniences, such as ventilation, face shields, ear protection, intercom etc.
Origins
Lawrence of Arabia on a Brough Superior SS100

T. E. Lawrence (known as Lawrence of Arabia) had a crash on a Brough Superior SS100 on a narrow road near his cottage near Wareham. The accident occurred because a dip in the road obstructed his view of two boys on bicycles. Swerving to avoid them, Lawrence lost control and was thrown over the handlebars.[1] He was not wearing a helmet, and suffered serious head injuries which left him in a coma; he died after six days in hospital. One of the doctors attending him was Hugh Cairns, a neurosurgeon , who after Lawrence's death began a long study of what he saw as the unnecessary loss of life by motorcycle despatch riders through head injuries. Cairns' research led to the use of crash helmets by both military and civilian motorcyclists.
Basic types

There are five basic types of helmets intended for motorcycling, and others not intended for motorcycling but which are used by some riders. All of these types of helmets are secured by a chin strap, and their protective benefits are greatly reduced, if not eliminated, if the chin strap is not securely fastened so as to maintain a snug fit.

From most to least protective, as generally accepted by riders and manufacturers, the helmet types are:
Full face

A full face helmet covers the entire head, with a rear that covers the base of the skull, and a protective section over the front of the chin. Such helmets have an open cutout in a band across the eyes and nose, and often includes a translucent plastic face shield, known as a visor that generally swivels up and down to allow access to the face. Many full face helmets include vents to increase the airflow to the rider. The significant attraction of these helmets is their protectiveness. Some wearers dislike the increased heat, sense of isolation, lack of wind, and alleged reduced hearing of such helmets.

Full face helmets intended for off-road use sometimes omit the face shield but extend the visor and chin portions to increase ventilation, since riding off-road is a very strenuous activity. Studies have shown that full face helmets offer the most protection to motorcycle riders because 35% of all crashes showed major impact on the chin-bar area.[3] Wearing a helmet with less coverage eliminates that protection  the less coverage the helmet offers, the less protection for the rider.

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