historical-trends-of-of-fighter-engine-problemsThrust/WeightYear1940 1950 1960 1970 1980 1990 20001098765432J75-17J79-15J57-21BAvon207F110-100F404-402F100-229F110-119AL-7FAL-21AL-31M88-2AL-31PM-53-5M-53-P2RB199EJ200R-27R-29R-79RD-33J85-13CTF30-109Uncooled turbinesCooled turbines Turbine inlet temperature [°K]Year1940 1950 1960 1970 1980 1990 2000 20001900180017001600150014001300120011001000Uncooled turbinesdT/dt=100°K/DecadeCooled turbinesdT/dt=150°K/DecadeAl-7FTF-41RD-33Avon 207AdourD-30F6F100-220F100-129F100-229RB199M88-2EJ200F414TF30-103TF30-111TF30-109J75-17J85-13CJ57-21BJ85-21Relative thrust / inlet surface areaYear1960 1970 1980 1990 2000Avon 307AdourRB199EJ200543210The historical trends of fighter aircraft engines can make it possible to draw conclusions regarding potential problems. Relative specific thrustYear1950 1960 1970 1980 1990 200010.90.80.70.60.50.4 TurbofansTurbojetsAl-7FAvon 301F100-100F404-402F100-129F100-220F100-229R-29R-79F414AL-21TF30-103TF30-109J85-130J75-21BJ79-17ARB199J85-21TF30-111J75-P17D-30F6