Essays /

Notar Essay

Essay preview

NOTAR: Anti-Torque System

Intro to Aircraft Systems
February 4, 2013

All single rotor helicopters need some way to counteract the torque that is created by the rotor blades spinning around the mast. The most common anti-torque system used on helicopters is the Tail Rotor System. The Tail Rotor System is a relatively small rotor and transmission attached at the end of the tail boom that is driven from a shaft coming from the main engine and transmission (ASA, Helicopter Flying Handbook 1-5). Another anti-thrust system used less frequently is the Fenestron system. It is driven in a similar way to the standard tail rotor system but instead of two rotor blades at the end of the boom there is a series of rotating blades that are enclosed in a protective shroud, thus adding a degree in safety by protecting the tail rotor blades from ground contact (ASA, Helicopter Flying Handbook 4-7). The anti-torque system I want to discuss in greater detail is called the “NOTAR” system. The NOTAR system is dramatically different in design as it does not require another rotor at the end of the tail boom to create thrust and in losing that tail rotor this system has a number of advantages, added safety being one of the crucial benefits. The NOTAR system uses the natural characteristics of aerodynamics along with thrust from pressurized air exiting the tail boom to provide the thrust needed to counter the torque being produced by the main rotor (ASA, Helicop...

Read more

Keywords

-5 -7 1 189 190 191 192 2006 2012 2013 4 6 60 900 abdollahi abil academ acceleromet act actual actuat ad add addit administr advantag aerodynam aerospaceindustrynews.webs.com air aircraft airflow airmen allow along also alway ambient amount angl anoth anti anti-thrust anti-torqu appear around asa attach augment auto aviat away baffl base basic begin behind benefit bigger blade boast boom boundari branch built c call characterist circumfer cite citi coanda cockpit colleg come common compar complet compon composit condit cone configur connect consist contact contain control convent counter counteract cover creat crosswind crucial damag damper decreas degre depart design detail differ direct discuss distinct downward downwash dramat driven due effect electro electro-mechan elimin enclos end energ engin enough ensur erni essenti evalu exit fact fan februari feder fenestron final fine first fli flight flow follow forc foreign forward frequent fuselag gain gearbox get greater ground gyro handbook hazard head helicopt help high hit hollow hook horizont hover improv inc includ increas industri inform input insid instal instead intak intro introduc involv jet keep lack larg later layer left length less level lift/thrust like locat look lose low lowest made mag main make maryland mast materi md mean mechan mesh move movement natur need newcastl nois notar nozzl number object obvious oklahoma one open opposit orient paper parallel park passeng pedal peopl perform pilot pitch point press pressur principl print process produc protect proven provid pull purpos rate reach rear rectangular reduc regard relat relationship remain requir research right rotat rotor rudder run safe safer safeti screen second sent sep seri shaft shroud side similar simpl singl slot small speed spin stabil stall standard state stephen strike suck suppli system tail test third though thrust thruster thus today top torqu transmiss transport turn twin two unison unit univers unlik use variabl variable-pitch vertic volum w.j wagtendonk walk want way web wide windi wing work yaw ysas