TRIKE.

A tricycle, often abbreviated to trike, is a human-powered (or gravity-powered) three-wheeled vehicle. Some trike tricycles, such as cycle rickshaws (for passenger transport) and freight trikes, are used for commercial purposes, especially in the developing world, particularly Africa and Asia.

In the West, adult-sized tricycles are used primarily for recreation, shopping, and exercise. Tricycles are favored by children and senior adults for their apparent stability versus a bicycle; however a conventional trike has poor dynamic lateral stability, and the rider must take care when cornering to avoid tipping the trike over. Unconventional designs such as recumbents have a lower center of gravity so require less care.

HISTORY;-
A three-wheeled wheelchair was built in 1655 or 1680 by a disabled German man, Stephan Farffler, who wanted to be able to maintain his mobility. Since he was a watch-maker, he was able to create a vehicle that was powered by hand cranks.

WHEEL CONFIGURATION

• Delta;-
  A delta tricycle has one front wheel and two rear wheels.
• Tadpole;-
  A tadpole tricycle has two front wheels and one rear wheel. Rear-wheel steering is sometimes used, although this increases the turning circle and can affect handling (the geometry is similar to a regular tricycle operating in reverse, but with a steering damper added).
• Other;-
  Some early pedal tricycles from the late 19th century used two wheels in tandem on one side and a larger driving wheel on the other.
  An in-line three-wheeled vehicle has two steered wheels, one at the front and the other in the middle or at the rear.

TYPES OF TRIKE

1.  Upright;- Upright resembles a two-wheeled bicycle, traditionally diamond frame, or open frame, but with either two widely spaced wheels at the back (called delta) or two wheels at the front (called tadpole). The rider straddles the frame in both delta and tadpole configurations. Steering is through a handlebar directly connected to the front wheel via a conventional bicycle fork in the delta, or via a form of Ackermann steering geometry in the case of the upright tadpole.
2. Recumbent;-Recumbent trikes’ advantages (over conventional trikes) include stability (through a low center of gravity) and low aerodynamic drag. Disadvantages (compared to bicycles) include greater cost, weight, and width. The very low seat may make entry difficult, and on the road, they may be less visible to other traffic.
3. Special purposes;- Some tricycles are designed for load carrying. Others are designed for racing or for comfort. Some recumbent tricycles are fully enclosed for all-weather use as well as for aerodynamic benefits; these are known as Velo mobiles. Some are designed to transport children.
4. Tilting;- Tricycles have been constructed that tilt in the direction of a turn, as a bicycle does, to avoid rolling over without a wide axle track. Examples have included upright, recumbent, delta, and tadpole configurations.
5. Braking;- Some trikes use a geometry (also called center point steering) with the kingpin axis intersecting the ground directly ahead of the tire contact point, producing a normal amount of trail. This arrangement, elsewhere called “zero scrub radius” is used to mitigate the effects of one-sided braking on steering. While zero scrub can reduce steering feel and increase wandering it can also protect novices from spinning out and/or flipping.

HOW TO RIDE A TRIKE

1. Never, ever, put your feet down. There are three wheels, so you won’t tip over. But most certainly you can “mousetrap” your feet under the body or rear wheels – not an enjoyable experience.
2. All units have a hand brake, just like the one in your car, and you must release it before moving out. Without a kickstand, there’s nothing but the hand brake to keep the trike from rolling into Grandma’s Corvette.
3. Look into and ahead of your direction of travel. Good advice, whether on two, three, or four wheels.

ADVANTAGES

1. You don’t have to put your feet down when you stop. You can take a passenger without fear that you will tip over the bike and spill the passenger into the road.
2. You can take the trike down a dirt or gravel road with ease. You won’t get fatigued in stop and go traffic.

DISADVANTAGES

1.  Compared to bicycles it includes greater cost, weight, and width.
2. The very low seat may make entry difficult.
3. On the road, they may be less visible to other traffic.

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