from the illustrations, /Kawasaki/KH_4-KH_4

from the blog, /2015/04

from the illustrations, /Mitsubishi/MH2000-MH2000

from the blog, /2013/09

from the blog, /2012/06

from the illustrations, /Brantly/B_2B-B_2B

from the illustrations, /Kamov/Helix_D-Ka_27-PS