 All were eager to see it put into production.State Acceptance trials followed, but the State evaluation team considered the Yak-20 too small and underpowered, recommending a redesign to match the performance of the Yak-18.Some of the criticisms of the State evaluation team were addressed in the second prototype, (Yak-20-2), which, as a result, became heavier and lost the performance edge of the first prototype.