Here is motor from the masters of propulsion engineering, Brother Hobby. This is a 2306 sized motor that only weighs 28g! This is crazy light for a motor with this much power.

Returner R5-2306 Motor

KV:2650KV

Configuration: 12N14P

No.of Cells(Lipo): 4-5S

Magnet: N52H arc magnets

Wire AWG: 20AWG

Shaft: Titanium Alloy hollow shaft

Stator: 0.15mm Nippon Steel silicon steel

Bearings:  Japan EZO  8x 4 x 3mm

Base casing: Al 7075

Bell cap: Al 7075 ( Double Anodizing colors )