Wednesday, April 17, 2019

                                          DARKENS  THE  SKIES

Are flying taxis about to become a reality?Flying cars could

 save us from climate change

Maybe the Jetsons were climate change activists? 

CNN: A new study shows that the cartoon family was on to something when they used a flying car for transportation. 
Several companies and even agencies such as NASA have been scrambling to create flying cars, hoping to launch the service in the next decade, and that may be a part of the answer to help curb climate change, according to a new study...

Nature Communications

 Role of flying cars in sustainable mobility

Akshat Kasliwal,  Noah J. Furbush,  James H. Gawron,  James R. McBride,  Timothy J. Wallington,  Robert D. De Kleine,  Hyung Chul Kim &  Gregory A. Keoleian
Interest and investment in electric vertical takeoff and landing aircraft (VTOLs), commonly known as flying cars, have grown significantly. However, their sustainability implications are unclear.
We report a physics-based analysis of primary energy and greenhouse gas (GHG) emissions of VTOLs vs. ground-based cars. Tilt-rotor/duct/wing VTOLs are efficient when cruising but consume substantial energy for takeoff and climb; hence, their burdens depend critically on trip distance.

For our base case, traveling 100 km (point-to-point) with one pilot in a VTOL results in well-to-wing/wheel GHG emissions that are 35% lower but 28% higher than a one-occupant internal combustion engine vehicle (ICEV) and battery electric vehicle (BEV), respectively. Comparing fully loaded VTOLs (three passengers) with ground-based cars with an average occupancy of 1.54, VTOL GHG emissions per passenger-kilometer are 52% lower than ICEVs and 6% lower than BEVs. VTOLs offer fast, predictable transportation and could have a niche role in sustainable mobility.