Keeping up with changes in automotive technology, in 1973, Renwal introduced the Visible Wankel kit, a working, motorized 1:3 scale model of a two-rotor rotary engine. As it is much rarer ...

Nearly three years in the making, behold the raw power and precision of this 1/3-scale V10 engine. Coming in at 125 ... There’s a staggering amount of work here, which begs the question: why?