The Wikipedia page for the Wright brothers suggests otherwise. Preceding theory informs practice, which in turn informs theory, ad infinitum. They wouldn’t have gotten off the ground without standing on the shoulders of giants’ previous theories, or without creating/updating theories from their experiments and then putting those theories to the test in practice.
Marx, Engels, and Lenin didn’t sit in a room and build castles in the sky. They (1) learned their predecessors’ theories, (2) deeply investigated the contemporary moment of the world, (3) updated preceding theories and developed new ones based on those investigations, (4) tested those theories in the real world, and so on in a dialectical manner.