REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

FLIGHT PERFORMANCE DETERMINATON OF THE PISTON ENGINE AIRCRAFT SOVA, COMPUTER PROGRAM "SOVAPERF"

NEMANJA VELIMIROVIĆ

YUGOIMPORT-SDPR, Belgrade, Serbia, velimirovicnemanja@yahoo.com

KOSTA VELIMIROVIĆ

Military Technical Institute, Belgrade, Serbia, kolevelimirovic@yahoo.com

Abstract: The method for the estimation of the piston, armed or non, aircraft performances is presented in this paper. "SOVAPERF" new computer program is used for the calculation of basic and special performances of the piston engine aircraft. Nonlinear model total energy which served as the computer program is basis for performance calculation. The computer program "SOVAPERF" consists of several modules: Module for determining the mass aircraft, Airport Module - based on current meteorological conditions determines the data of the airport. This module requests data: frontal wind speed, slop and quality of the runway, Atmosphere Module - data calculations are made for the altitude. It works for all conditions from polar to tropical. Aerodynamics Module - loaded aerodynamic characteristics of clean, takeoff and landing configurations. This module also presents data on the aerodynamic characteristics of the launcher under the wing and weapons, Engine Module - provides information on the performance and fuel consumption in function of the regime and the height of flight. Performance Module - computes the minimum and maximum speed, climb and ceiling. Turn Module - turnaround data calculation. Takeoff and Landing Modules - presents all data related to the take-off and landing. The data refers to the characteristic length, velocity, time and fuel consumption. Cruise Module - optimal parameters of cruising. Start, Taxi and Combat Modules - compute fuel consumption and other data. Range Module - the most complex module of the computer program "SOVAPERF". This module calls all the listed modules and determines the maximum length of the flight profile. The method and its results are illustrated by the numerical example. SOVA armed, aircraft performances are presented in numerical example. Used programming language is MATHCAD 14.

Keywords:. Aircraft, piston engine, performances, computer program.