I am just wrapping up an RCU review of the AB Models 1/4 Scale Cub equipped with a YS 1.60... Its a pricey engine but it an absolutely wonderful combination and best of all its a fairly light engine so you would not be adding more fat. . It would easily fly the plane at 16 pounds and balance out nicely. Its just ridiculous power on my Cub at ~13 pounds with an 18x6 prop, 16 pounds should still be an easy task for the engine.