Identify by helicopter characteristics

PZL Sokol used elements like the main rotor, turboshaft engine placement and fixed gear of the Mi-2 it built under license to create the W-3 helicopter. The W-3 has a longer cabin and a three blade tail rotor.

The PZL SW-4 looks a bit like having the fuselage of an AS350 matched to a wider tail boom, similar to that of the Schweizer 330. It has a typical fairing from the engine/gear box housing on top of the fuselage to the tail rotor. The tail has a true cruciform shape.

The name already says it: it is a smaller version of the Hughes 500. Indeed the basic shape is very similar, but the Mini 500 has a two blade main and two blade tail rotor. The cabin provides space for just the pilot.

A single seat helicopter with a narrow, tube-like tail boom, braced to the rear fuselage by two tubes. It has a two-blade main and tail rotor, with a rather long rotor mast. Typical is the nose of the fuselage pointing slightly up!

This small helicopter has a two blade main rotor placed high above the fuselage, on a long trapezium shaped pylon covering the rotor axis. The engine is placed in the rear fuselage, below the slender tail boom, and is not covered. There are stabilising fins up and down, and a smaller one to the right.

The long cabin variants of the Robinson R22 have a sort of pointed bent in the rear of the fuselage, around the engine that is covered compared to the smaller R22. The R44 and R66 retain the typical fairing around the long rotor mast, narrow tail boom and tail, and have no engine housing on top of the fuselage

The open frame tail boom with a small vertical fins with undefined shape, uncovered engine and the somewhat pointed nose are the key characteristics of this two blade helicopter. It also has small horizontal stabiliser.

This small helicopter seems to have a bathtub-like fuselage with a large multi framed bubble canopy on top and a tail boom sticking out of the rear. It has a three blade main rotor on a long mast behind the canopy, and a two blade tail rotor on top of the vertical fin.

The Shahed 285 is a Bell 206 with a narrower fuselage with many flat panels, including the single seat cockpit. The helicopter has no stub wings, but pipes under which the weapons are hung. Quite typical is the streamlined nose with gun turret in it. (photo: Shahram Sharifi/WikiMedia)

The world's first mass-produced helicopter has a square fuselage cross section. The fuselage of the R-4 gradually tapers into the tail boom. It has no vertical stabiliser, but an open frame that holds the tail rotor on top. The tail wheel it attached to the middle of the tail boom by long struts.