Patent ID: 9688395
Date: 2017-06-27
CPC Classifications: B64C,F01D

Claim:
1. A propeller including a hub and at least one boundary layer ingesting (BLI) blade having a span, the at least one BLI blade comprising: a root section having an inboard end connected to the hub and an outboard end, the inboard end of the root section having a chordal length and a maximum thickness location defined at approximately 25% of the chordal length; a tip section disposable at a distance from the hub and having a twist; and a body extending in a spanwise dimension from the outboard end of the root section to the tip section, the body having a local twist from the root section to about a 70% span location, which is greater than the twist of the tip section, to thereby reduce local angles of attack in a boundary layer region defined in and around the root section.