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  "documentTitle": "Archer Aviation Inc (ACHR)",
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  "presentationDate": "2025-08-27 00:00:00",
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      "text": "The forces on these eVTOL propellers, and a helicopter tail rotor are strong and cause bending moments on the blades of the propeller. When rigidly attached, these bending moments can manifest as substantial vibrations and noise, and lead to blade failure or other objectionable resonance issues.",
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      "text": "THE REPORT AND ALL STATEMENTS CONTAINED HEREIN ARE THE OPINIONS OF GRIZZLY RESEARCH...",
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      "text": "Hinge mechanism to alleviate edgewise flight forces and moments",
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      "text": "Rigid attachment of propeller to blade, resulting in high force and moment transfer (increased noise and vibration)",
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      "text": "The Beta Alia-250 VTOL is a very interesting comparison to the Archer Midnight. The Alia VTOL variant uses 2-bladed lifter propellers... image analysis indicates the Alia-250 VTOL has hinges as shown in the following graphic.",
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      "text": "The reason for such hinges is obvious to any aerospace engineers... Simply putting a hinge in the mechanism alleviates most of these bending moments... This is consistent with our cross examination of the Midnight design...",
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      "text": "Archer Aviation, The Nikola of the Skies",
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