公开(公告)号：US20180297693A1

公开(公告)日：2018-10-18

申请号：US15853045

申请日：2017-12-22

Applicant: Facebook, Inc.

Inventor： Zhang Liu ,  Amnon G. Talmor ,  Yusong Cao

IPC: B64C23/06 ,  B64C3/10

Abstract: In one embodiment, an aircraft includes a number of propellers Nprop, wherein each propeller comprises a diameter dprop, has a propeller efficiency ηprop, and is configured to absorb power pprop to rotate at a rate RPM to generate thrust for a flight speed V of the aircraft. The aircraft may further include a total power ptotal absorbed by the propellers that is approximately pprop×Nprop, a wing having a circulation distribution, wherein the wing comprises a wingspan B, a drag D that is approximately equal to ptotal×ηprop/V. For V and B, the circulation distribution, dprop, and RPM substantially minimizes D.