Estimation of the Performance of the Bell 206 Helicopter at Different Flight Altitudes

U diplomskom radu obrađeni su osnovni pojmovi vezani za atmosferu kao što su tlak, gustoća i temperatura zraka. Tlak, gustoća i temperatura zraka imaju važan utjecaj na performanse helikoptera Bell 206B. Objašnjeno je kakav atmosfera ima utjecaj na performanse helikoptera uz pomoć formula i dijagrama. Pomoću priručnika određene su performanse helikoptera Bell 206B za različite visine leta, koje su provjerene praktičnim letom. Nadalje, napravljena je usporedba tih podataka i koji su uzroci odstupanja podataka iz priručnika i podataka iz leta. Glavni uzroci odstupanja mogu biti: greška u tehnici pilotiranja, utjecaj vjetra i točnost pokazivanja instrumenata.This paper deals with basic concepts related to the atmosphere such as air pressure, density and temperature. Air pressure, density and temperature have an important impact on the performance of the Bell 206B helicopter. It is explained what kind of impact the atmosphere has on helicopter performance with the help of formulas and diagrams. The manual determines the performance of Bell 206B helicopters for different flight altitudes, which were tested in practical flight. Furthermore, a comparison was made between these data and what are the causes of the discrepancy between the data from the manual and the data from the flight. The main causes of deviations can be: error in piloting technique, wind influence and accuracy of instrument display