Gravity racer

（重定向自Billy cart）

Soapbox cars at the finish line of a race

An official Soapbox derby racer from 1967

A gravity racer or soapbox is a motorless vehicle which is raced on a downhill road either against the clock or against another competitor. Although most are built for the purpose of recreation, some gravity racing teams take the sport more seriously and compete to win. They are propelled by gravity and can achieve speeds upwards of 112 km/h (70 miles per hour).

单词	Billy cart
释义	Billy cart 英语百科 Gravity racer （重定向自Billy cart） A gravity racer or soapbox is a motorless vehicle which is raced on a downhill road either against the clock or against another competitor. Although most are built for the purpose of recreation, some gravity racing teams take the sport more seriously and compete to win. They are propelled by gravity and can achieve speeds upwards of 112 km/h (70 miles per hour).
随便看	curve of light distribution的意思 curve of limiting positions of center of gravity的意思 curve of load的意思 curve of loads的意思 curve of logs的意思 curve of longitudinal center of buoyancy的意思 curve of longitudinal centers of buoyancy的意思 curve of longitudinal centers of floatation的意思 curve of longitudinal metacenter的意思 curve of magnetic polar wandering的意思 curve of magnetization的意思 curve of maximum bending moments的意思 curve of maximum convexity的意思 curve of memory的意思 curve of metacenter的意思 curve of molded displaced volumes versus draft的意思 curve of molded volumes的意思 curve of moment against incidence的意思 curve of moment to alter trim one centimetre的意思 curve of moment to change trim one centimeter的意思 curve of moment to change trim one inch的意思 curve of Monson的意思 curve of neutral stability的意思 curve of normal distribution的意思 curve of occlusal的意思