Ditch the sail. It catches wind unpredictably. Use the standard cart chassis, place one red motor facing right, and add two small wheels at the bottom. (Yes, wheels on a flying machine. Trust me.)
And suddenly, your perfectly crafted flying machine turns into a pile of scrap metal and piggy tears. bad piggies 1-31
Tap the motor once to ignite it. Let your pig roll off the edge. Do not hold the accelerator. As you leave the cliff, gravity will do its job. Ditch the sail