Wheelie

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In a vehicle acrobat, wheelie , or wheelstand , is a vehicle maneuver in which the front wheel or wheel is detached from the ground due to sufficient torque applied to the rear wheel or wheel, or relative rider movement against the vehicle. Wheelies are usually associated with bicycles and motorcycles, but can be done with other vehicles such as cars, especially in drag racing and pulling tractors.

Video Wheelie

Histori

The first move was done in 1890 by bicycle trick driver Daniel J. Canary, shortly after the modern bike became popular. Wheelies appeared in popular culture as early as 1943, when the US Army motor cavalry was depicted in Life magazine featuring high-speed wheelies. Daredevil Evel Knievel performs motorcycle acrobatics including wheelies on his show. Doug "The Wheelie King" Domokos has achieved such a 145 mile (233 km) wheelie feat.

Maps Wheelie

Type

The types of wheelie can be divided into two broad categories:

1. wheelies where the vehicle's power is self-sufficient, as described in the Physics section below. These include:

• Clutch wheelies : done by releasing the clutch and opening the throttle to let the engine race and then engage the clutch unexpectedly.
• Power wheelies or roll-on wheelies : done just by opening the throttle. If the machine has enough power, it will be able to lift the front wheel.

2. wheelies are performed with the help of suspension dynamics or rider movements. These include:

• Bounce wheelies or slap wheelies : done by opening and closing the throttle in time with a rebound suspension, rebound tire, rider movement, or a combination of three.
• Manual : done without applying torque to the rear wheels at all, but instead by moving the rider's body back relative to the bike, and then pulling the handlebars near the available end of the journey.

Bicycle

Wheelies are a common action in artistic cycling and BMX freestyle. This motor is balanced by the weight of the rider and sometimes use the rear brake. Bicycle style, wheelie bikes, have a sitting position, and thus a center of mass, almost on the rear wheel that facilitates wheelies.

Motorcycles

A wheelie is also a common motor action. The principle is the same as wheelie bikes, but the throttle and rear brakes are used to control the wheelie while the rider uses weight and steering to control the inertial direction of the rotating front wheel that acts as a balance.

The fastest motorcycle record in the world is 307.86 km/h (191.30 mph) by Patrik Furstenhoff. 18 April 1999. The world record for fast wheelie along 1 km (0.6 mi) is 343,388 km/h (213,371 mph), set by Egbert van Popta at Elvington Airport in Yorkshire, England.

In some countries, such as Britain and the United States, motorcyclists who do wheelie on public roads may be prosecuted for dangerous driving, offenses that may carry large fines and a year or more ban.

In Pakistan, India, and some other countries, it is illegal to carry out such an action. If a person is caught doing these actions, he or she can have his motorcycle confiscated and potentially face prison time.

Automobiles

Wheelies are common in drag racing motors or cars, where they represent a wasted torque lifting the front end, rather than moving the vehicle forward. They also usually produce an increase in the center of mass, which limits the maximum acceleration. In the absence of wheel bars, this effect is quantified in the physics section below. If the wheelie bar is present then the wheelie results in a load reduction on the rear wheel drive, along with an appropriate reduction in friction.

Snowmobiles

Fish wheels may be with some snowmobiles, where it is a ski lifted from the ground.

Wheelchairs

Some wheelchair users can learn to balance their seats at the rear wheels and do wheelie. This allows them to climb and down the curbs and maneuver through small obstacles. Sometimes wheelchair dancers do wheelies.

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Slide

Cart cart helps prevent the front end of the vehicle zooming too high or upside down. A wheelie bar is required for some tractor and tug truck events. Wham-O develops and sells add-on wheelie bars for wheelie bikes.

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Physics

Sebuah wheelie sudah dekat ketika percepatan cukup untuk mengurangi beban yang ditanggung oleh poros depan ke nol. Kondisi untuk ini dapat dihitung dengan apa yang disebut "persamaan transfer berat":

${\ displaystyle \ Delta Weight_ {front} = a {\ frac {h} {w}} m}  ÂÂ$

di mana ${\ displaystyle \ Delta Weight_ {front}}  ÂÂ$ adalah perubahan dalam beban yang ditanggung oleh roda depan, ${\ displaystyle a}  ÂÂ$ adalah akselerasi longitudinal, $            {\displaystyle         h      }        \{\backslash \; displaystyle\; h\}\;  ÂÂ$ adalah pusat dari ketinggian massa, ${\ displaystyle w}  ÂÂ$ adalah wheelbase, dan ${\ displaystyle m}  ÂÂ$ adalah total massa kendaraan.

Ekspresi ekuivalen, yang tidak perlu mengetahui beban yang ditanggung oleh roda depan atau massa kendaraan total, adalah untuk akselerasi longitudinal minimum yang diperlukan untuk wheelie:

${\ displaystyle a_ {min} = g {\ frac {b} {h}}}  ÂÂ$

di mana ${\ displaystyle g}  ÂÂ$ adalah akselerasi karena gravitasi, ${\ displaystyle b}  ÂÂ$ adalah jarak horizontal dari poros belakang ke pusat massa, dan adalah jarak vertikal dari tanah ke pusat massa. Dengan demikian percepatan minimum yang diperlukan berbanding lurus dengan seberapa jauh pusat massa terletak dan berbanding terbalik dengan seberapa tinggi letaknya.

Because mechanical strength can be defined as the velocity of power time, in one dimension, and the equivalent force of acceleration mass time, the minimum power required for the wheelie can be expressed as the minimum product mass, speed, and acceleration required for the wheelie:

${\ displaystyle P_ {min} = mva_ {min}}$

Thus the minimum required power is directly proportional to the mass of the vehicle and its speed. The slower the vehicle moves, the less power it takes to do the wheelie, and that's even without considering the power required to overcome the air resistance, which increases with the speed cube. Therefore, the amount of power most needed is when the vehicle starts to accelerate from rest.

In the case of tractors and trucks pulling, the force to pull the load is applied above the ground, and therefore also serves to lift the front wheel and thereby reduce the forward acceleration required to lift the front wheel.

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Gallery

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See also

• The dynamics of bicycles and motorcycles
• Ski (driving action)
• Stoppie
• Transfer weight

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Note

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External links

• Media associated with Wheelie on Wikimedia Commons
• How to wheelie on Wikibooks

Source of the article : Wikipedia