active stabilizer
21Aileron — For the band, see The Ailerons …
22T-54/55 — Infobox Weapon name= T 54/55 caption= Polish T 55A, Poznań Citadel Museum of Arms () origin= Soviet Union type= Main battle tank is vehicle= yes is UK= yes service= 1947–present used by= wars= designer= Morozov (T 54), OKB 520 (T 54A and later)… …
23Differential amplifier — symbol The inverting and non inverting inputs are distinguished by − and + symbols (respectively) placed in the amplifier triangle. Vs+ and Vs− are the power supply voltages; they are often omitted from the diagram for simplicity, but of course… …
24Undercarriage — This article is about aircraft landing gear. For the Devin the Dude album, see Landing Gear. Undercarriage Undercarriage of a Boeing 777 300 …
25Dornier Do 217 — Do 217 Do 217 E 2 Role Medium bomber Heavy bomber …
26PT-76 — Infobox Weapon|is vehicle=yes name=PT 76 caption=PT 76 on display near the Museum of the Great Patriotic War, Kiev. type=Amphibious Light Tank origin=flagcountry|Soviet Union service=16 August 1952 present used by=See Operators wars=See Combat… …
27Cromoglicic acid — Systematic (IUPAC) name 5,5′ (2 hydroxypropane 1,3 diyl)bis(oxy)bis(4 oxo 4H chromene 2 carboxylic acid) Clinical data AHFS/ …
28Obyekt 279 — Infobox Weapon name= Obyekt 279 caption= Obyekt 279 on display at Kubinka Tank Museum origin= flagcountry|Soviet Union type= Super heavy tank is ranged= is bladed= is explosive= is artillery= is vehicle=yes is missile= is UK= service= used by=… …
29Saab 340 — Infobox Aircraft subtemplate=Infobox Saab Airliners name = Saab 340 type = Passenger aircraft manufacturer = Saab caption = Saab 340A of Aurigny Air Services designer = first flight = 25 January 1983 introduced = 1983 status = Out of production… …
30Helicopter rotor — This article is about helicopter main rotor systems. For antitorque control, see tail rotor. Helicopter rotor The rotor head of a Sikorsky S 92 A helicopter main rotor or rotor system is a type of fan that is used to generate both the aerodynamic …
