Editing Three-wheeler (section)

=== Two front{{Anchor|Tadpole}} ===
A configuration of two wheels in the front and one wheel at the back presents two advantages: it has improved [[aerodynamics]], and that it readily enables the use of a small lightweight motorcycle powerplant and rear wheel. This approach was used by the [[Messerschmitt KR200]] and BMW [[Isetta]]. Alternatively, a more conventional front-engine, front wheel drive layout as is common in four-wheeled cars can be used, with subsequent advantages for transversal stability (the center of mass is further to the front) and traction (two driven wheels instead of one). Some vehicles have a front engine driving the single rear wheel, similar to the rear engine driving the rear wheel. The wheel must support acceleration loads as well as lateral forces when in a turn, and loss of traction can be a challenge.

A new tadpole configuration has been proposed with a rear engine driving the front wheels.  This concept (Dragonfly Three Wheeler<ref>{{Cite web|last=Design|title=Dragonfly three wheeler|url=http://www.dragonflythreewheeler.com/|access-date=2021-06-09|website=www.dragonflythreewheeler.com|language=en-US}}</ref>) claims both stability and traction (two driven wheels), as well as a unique driving experience.

With two wheels in the front (the "tadpole" form or "reverse trike") the vehicle is far more stable in braking turns, but remains more prone to overturning in normal turns compared to an equivalent four-wheeled vehicle, unless the center of mass is lower and/or further forward. Motorcycle-derived designs suffer from most of the weight being toward the rear of the vehicle.{{citation needed|date=May 2015}}

For lower [[wind resistance]] (which increases [[fuel efficiency]]), a teardrop shape is often used.{{Citation needed|reason=not many lowest drag vehicles are teardrop shaped|date=January 2011}} A teardrop is wide and round at the front, tapering at the back. The three-wheel configuration allows the two front wheels to create the wide round surface of the vehicle. The single rear wheel allows the vehicle to taper at the back. Examples include the [[Aptera (solar electric vehicle)]] and [[Myers Motors NmG]].