| One set of rotors | Skid rails (even if with wheels) |
| Wheels (fixed or retractable) | |
| Two separate sets of rotors |
One tail Kaman K-Max No tail McDonnell Douglas MD Explorer
Engine mounted above boom Aerospatiale Alouette II Rear fin Bell 47 Two-seater Brantly B-2 Four-seater Robinson R44
Fins on tailplane Aerospatiale SA.341/342 Gazelle None of the above features Guimbal G2 Cabri
Tail below fuselage boom level, engine uncovered Silvercraft SH-4 Tail below fuselage boom level Enstrom 280 Shark Engine uncovered, rear fin Hughes/Schweizer 269/300/300C/TH-55A Osage Transmission to tail-rotor jointed along fuselage boom Rogerson Hiller UH-12/260/H-23 Raven Armed attack helicopter Bell AH-1 HueyCobra/SeaCobra None of the above features Robinson R22 Alpha
Engine uncovered Westland Scout Tail-plane above tail rotor McDonnell Douglas 500 Sponsons on each side of fuselage Bell 222UT Tail-rotor on top of tail MBB-Kawasaki Bk.117 MBB BO 105 MBB BO EC 135 None of the above features Bell 206L LongRanger III Bell 206L-4 LongRanger
(Half) tail-plane on top of tail Westland Lynx (AH.1) Tail-rotor on starboard side Bell 212/412/212ASW Bell 214A/214B/214ST Sliding cabin door, with one window Bell 204/UH-1 Iroquois Sliding cabin door, with two windows Bell 205/UH-1 Iroquois/205A-1 None of the above features Rogerson RH-1100
Tail-rotor on port side Bell 206 JetRanger/OH-58 kiowa Bell 206L Long Ranger Tail-rotor on starboard side, tailplane on top of tail Mil Mi-34 'Hermit' Tail-rotor on starboard side Aerospatiale AS.350/355 Ecureuil/AStar/TwinStar
Engine uncovered Aerospatiale Alouette III Engine covered Brantly-Hynes 305
Tandem two-seater, stealth design Boeing/Sikorsky RAH-66 Commanche Fixed wheel Aerospatiale SA.360/361H Dauphin Retractable wheels Aerospatiale SA.365 Dauphin 2 Aerospatiale AS.565 Panther
Two tails below fuselage boom level Kamov Ka-26/126 'Hoodlum' Two tails Kamov Ka-27 'Helix' Kamov Ka-29/31 Three tails Kamov Ka-25 'Hormone' One tail Kamov Ka-50 Werewolf (Hokum)
One wheel strut each side Sikorsky S-64 Skycrane/CH-54 Tarhe Two wheel struts each side Mil Mi-10/K 'Harke'
tail-rotor located at fuselage level Bell 222 tail-rotor located on top of tail Westland 30
Agusta A109
Engine uncovered Westland Wasp Tandem two-seater attack helicopter, fins on tailplane Eurocopter Tiger Tandem two-seater attack helicopter McDonnell Douglas AH-64A Apache Agusta A129 Mangusta Cockpit on upper deck Mil Mi-4 'Hound' Sikorsky S-55/H-19/S-55T Sikorsky S-58/S-58T/CH-34 Choctaw Westland Wessex High-mounted wings, two cockpits Mil Mi-24 'Hind D' High-mounted wings Mil Mi-6 'Hook' Fin extension on lower half of tail Kaman H-2 Seasprite Sponsons on each side of fuselage EHI EH 101 Mil Mi-14 'Haze' Tail-plane hinged on lower tail Sikorsky S-70/UH-60A Black Hawk Sikorsky SH-60B Seahawk Eight-bladed rotor Mil Mi-26 'Halo' None of the above features Mil Mi-2 'Hoplite' Mil Mi-8/Mi-17 'Hip' Sikorsky S-76 Spirit PZL Swidnik W-3 Sokol (Falcon)
Tail and tail-rotor tilted (40 degrees to port side) Sikorsky CH-53E Super Stallion Large engine housings each side of upper fuselage Sikorsky S-56/H-37 Mojave Side floats with struts Aerospatiale SA.321F Super Frelon Sikorsky S-61L/N Sikorsky S-62 Sikorsky SH-3/S-61 Westland Sea King/Commando Side floats without struts Sikorsky S-61R/CH-3E/HH-3F Pelican Sikorsky S-65A/CH-53 Sea Stallion NH NH90 No side floats Westland Lynx HAS.2
Tandem two-seater Atlas CSH-2 Rooivalk Mil Mi-28 'Havoc' Fuselage fin below tail Aerospatiale SA.332 Super Puma No fin below tail Aerospatiale/Westland SA.330 Puma
Rear side floats Boeing-Vertol H-46 Sea Knight/107 No side floats Boeing-Vertol CH-47 Chinook