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Molecular outflows are believed to be a key ingredient in the process of starformation. The molecular outflow associated with DR21 Main in Cygnus-X is oneof the most extreme, in mass and size, molecular outflows in the Milky Way. Theoutflow is suggested to belong to a rare class of explosive outflows which areformed by the disintegration of protostellar systems.We aim to explore themorphology, kinematics,and energetics of the DR21 Main outflow, and comparethose properties to confirmed explosive outflows to unravel the underlyingdriving mechanism behind DR21. Line and continuum emission are studied at awavelength of 3.6\,mm with IRAM 30 m and NOEMA telescopes as part of the CygnusAllscale Survey of Chemistry and Dynamical Environments (CASCADE) program. Thespectra include ($J= 1-0$) transitions of HCO$^+$, HCN, HNC, N$_2$H$^+$,H$_2$CO, CCH tracing different temperature and density regimes of theoutflowing gas at high-velocity resolution ($\sim$ 0.8 km s$^{-1}$). The mapencompasses the entire DR21 Main outflow and covers all spatial scales down toa resolution of ~3" ($\sim$ 0.02 pc). Integrated intensity maps of the HCO$^+$emission reveal a strongly collimated bipolar outflow with significant overlapof the blue- and red-shifted emission. The opening angles of both outflow lobesdecrease with velocity, from $\sim80$ to 20$^{\circ}$ for the velocity rangefrom 5 to 45 km s$^{-1}$ relative to the source velocity. No evidence is foundfor the presence of elongated, "filament-like" structures expected in explosiveoutflows. N$_2$H$^+$ emission near the western outflow lobe reveals thepresence of a dense molecular structure which appears to be interacting withthe DR21 Main outflow. The overall morphology as well as the detailedkinematics of the DR21 Main outflow is more consistent with that of a typicalbipolar outflow instead of an explosive counterpart.

The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE. II. A detailed kinematic analysis of the DR21 Main outflow