Специально для Уважаемого Yakovlyev демонстрирую как и что было сделано братьями Карл(ами) для тестирования нагрузочных характеристик крыла Ну и легкая пояснительная записка прилагается :
Wing Load Test Fixture
The base of our wing load test fixture is now built. This fixture will allow us to simulate aerodynamic loads and validate the structural integrity of the wing under positive g-loads (flight loads that push up on the bottom of the wing) prior to flight testing. For this load test we perform a proof load and do not take the wing to total failure. Prior to the load test, we will be installing additional reinforcement of the structure and testing basic loads before performing the full test. For negative g-loads (flight loads that push down on the top of the wing), we will reconfigure the fixture for this condition and perform additional proof load tests.