Batgirl defies science!

According to the findings of physicists at the University of Leicester, published in the university's Journal of Special Physics Topics and reported in Wired Science:

“Clearly gliding using a batcape is not a safe way to travel, unless a method to rapidly slow down is used, such as a parachute.”

The proposed parachute would surely diminish the impact of Batman’s stylish flourish when he flicks the cape aside on landing — not to mention, detract from the terror it instills in enemies when he goes for the full wing span, narrow-eyed bat impersonation, pre-attack.

Nevertheless, the physics is undeniable.

After accounting for the drag and lift forces acting on Bruce Wayne in flight, the doomed trajectory was calculated. The 15.4-foot wingspan is just half that of an ordinary hang glider and, when launching off an 492-foot-high Gotham city skyscraper and gliding (successfully, the team predicted) for around 1,150 feet, Batman’s velocity would peak at 68 mph before levelling off at a life-threatening 50 mph descent.

The paper does admit that variations in the angle of the glide were not taken into account, and could contribute to a safe landing. However, Batman would need to slow significantly to avoid becoming a messy afterthought for Gotham city’s road sweepers.

The paper also does not take into account Batgirl's fearlessness and dedication to justice. You can see it in her eyes.