$55 CH53X VTOL Low-poly 3D model by digiwerk. Available on CGTrader with 127008 polys and 145522 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 56.6 MB), TEXTURES (Textures, filesize: 41.8 MB), FBX (Autodesk FBX, filesize: 137 MB), MAX (Autodesk 3ds Max, filesize: 64.3 MB)