Making notes on discussions of blade flapping.

Definite gravy but easy to add. Currently blade flexing is done via blended animation controlled by the simulation sending key values to the model. The CH-47 has quite a large blade system (almost doubling the length of the helicopter to 100 feet) and low ground clearance.

Most of the droop comes from the flapping hinge Dave has indicated in white (adjoining the red highlights). These pivots allow the blade to horizontally move upward when the blade is advancing, and down when retreating.

Additionally the blade model hierarchy to allow for visible blade pitching and the Apache blades retro-fitted to do the same.

Source