1. Wheel hub? 2. Speed increase box? 3. Engine room cover? 9. Yaw training? 10. Yaw brake? 11. Yaw roll? 12. Basis? 13. Elastic base?
The keel is fixed then the plates are sealed on both sides and filled in the middle with sound-absorbing cotton will be enough. Choose the board based on the amount of edge you need. The worst option is to use plasterboard directly. Of course, if the requirements are higher, you can create a soundproof room with door observation windows. and vents, etc. However, the budget is relatively large~