Investigation of a novel VTOL aircraft concept for operations in urban areas

Salvatore Sedda, Costantino Sardu, Gaetano Iuso


Experimental investigation on a novel VTOL aircraft named \Anuloid "has been carried out to assess its aerodynamics
performances. The study focused on two main aspects: the analysis of the Coanda eect on the 1:20 scaled model
without cross- ow and the aerodynamic characterization of the body, performed on the 1:5 scaled model in a large wind
tunnel. The rst task included the study of the Coanda eect, both in hovering and in ground eect conditions. Basic
and modied geometries for the fan duct outlet were also investigated and the in uence of the Reynolds number was
evaluated. A simplied preliminary analysis on the eectiveness of the maneuverability surfaces was nally conducted.
Results evidenced that the Coanda eect is present only for the modied geometries of the outlet section, whereas the
basic geometry gives rise to early ow separation. The wind tunnel tests highlighted that the aircraft has poor lift and
high drag in normal ight condition, i.e. when < 0. In addition to this, the pitching moment is negative in the
whole range of incidences tested, resulting in longitudinal instability. Finally, pressure distributions revealed massive
ow separation on both lower and upper surfaces that gives rise to a very complex unsteady and three-dimensional ow
eld conguration around the body.


VTLO; Flying urban car; Aircraft configurations; wind tunnel testing; aerodynamics performances; Coanda effect

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