![Solar and Drag Sails](http://www.spacexview.shop/cdn/shop/products/PR71_1400x458.png?v=1623162945)
The main advantage of "propellant-free" solar sails is that they avoid the need for relatively large and expensive propellants. Dragsail technology also utilizes higher altitude, propellant-free solar sail technology, and ultimately aerodynamic force to drag the spacecraft down and burn it in the Earth's atmosphere.