Here I complied data for some military aircraft.
1st generation of aircraft
Mig 15
Empty weight: 3,580 kg
Loaded weight: 4,960 kg
Max. takeoff weight: 6,105 kg
Loaded weight to empty weight ratio: 1.385
Maximal takeoff weight to empty weight ratio: 1.705
Thrust/weight: 0.54
*F-86 Sabre
Empty weight: 5,046 kg
Loaded weight: 6,894 kg
Max. takeoff weight: 8,234 kg
Loaded weight to empty weight ratio: 1.366
Maximal takeoff weight to empty weight ratio: 1.63
Thrust/weight:*0.38
Dassault Ouragan
Empty weight: 4 142 kg
Loaded weight: 7 404 kg
Max. takeoff weight: 7 900 kg
Loaded weight to empty weight ratio: 1.78
Maximum takeoff weight to empty weight ratio: 1.9
Thrust/weight: no available
2nd-3rd generation of aircraft
Mig-21-93
Empty weight: 5339 kg
Loaded weight: 8725 kg
Max. takeoff weight: 10.400 kg
Loaded weight to empty weight ratio: 1.63
Maximum takeoff weight to empty weight ratio: 1.95
Thrust/weight: 0.79
F-5E Tiger II
Empty weight: 4349 kg
Loaded weight: 7157 kg
Max. takeoff weight: 11214 kg
Loaded weight to empty weight ratio: 1.64
Maximum takeoff weight to empty weight ratio: 2.57
Thrust/weight: 0.79
4th generation of aircraft
F-15C
Empty weight: 12700 kg
Loaded weight: 20200 kg
Max. takeoff weight: 30845 kg
Loaded weight to empty weight ratio: 1.59
Maximum takeoff weight to empty weight ratio: 2.42
Thrust/weight: 1.12
Su-27S
Empty weight: 16380 kg
Loaded weight: 23430 kg
Max. takeoff weight: 30450 kg
Loaded weight to empty weight ratio: 1.43
Maximum takeoff weight to empty weight ratio: 1.85
Thrust/weight: 1.07
MiG-29
Empty weight: 11000 kg
Loaded weight: 15300 kg
Max. takeoff weight: 20000 kg
Loaded weight to empty weight ratio: 1.39
Maximum takeoff weight to empty weight ratio: 1.82
Thrust/weight: 1.09
Mirage 2000C
Empty weight: 7500 kg
Loaded weight: 15300 kg
Max. takeoff weight: 20000 kg
Loaded weight to empty weight ratio: 2.04
Maximum takeoff weight to empty weight ratio: 2.67
Thrust/weight: 0.7 (for loaded weight)
F-16C Block 30
Empty weight: 8570 kg
Loaded weight: 12000 kg
Max. takeoff weight: 19200 kg
Loaded weight to empty weight ratio: 1.37
Maximum takeoff weight to empty weight ratio: 2.24
Thrust/weight: 1.09 (for loaded weight)
Question: Why from 3rd generation of jet fighters Soviet/Russian jet fighters are behind their Western counterparts in loaded weight to empty weight and maximum takeoff weight to empty weight ratios?
1st generation of aircraft
Mig 15
Empty weight: 3,580 kg
Loaded weight: 4,960 kg
Max. takeoff weight: 6,105 kg
Loaded weight to empty weight ratio: 1.385
Maximal takeoff weight to empty weight ratio: 1.705
Thrust/weight: 0.54
*F-86 Sabre
Empty weight: 5,046 kg
Loaded weight: 6,894 kg
Max. takeoff weight: 8,234 kg
Loaded weight to empty weight ratio: 1.366
Maximal takeoff weight to empty weight ratio: 1.63
Thrust/weight:*0.38
Dassault Ouragan
Empty weight: 4 142 kg
Loaded weight: 7 404 kg
Max. takeoff weight: 7 900 kg
Loaded weight to empty weight ratio: 1.78
Maximum takeoff weight to empty weight ratio: 1.9
Thrust/weight: no available
2nd-3rd generation of aircraft
Mig-21-93
Empty weight: 5339 kg
Loaded weight: 8725 kg
Max. takeoff weight: 10.400 kg
Loaded weight to empty weight ratio: 1.63
Maximum takeoff weight to empty weight ratio: 1.95
Thrust/weight: 0.79
F-5E Tiger II
Empty weight: 4349 kg
Loaded weight: 7157 kg
Max. takeoff weight: 11214 kg
Loaded weight to empty weight ratio: 1.64
Maximum takeoff weight to empty weight ratio: 2.57
Thrust/weight: 0.79
4th generation of aircraft
F-15C
Empty weight: 12700 kg
Loaded weight: 20200 kg
Max. takeoff weight: 30845 kg
Loaded weight to empty weight ratio: 1.59
Maximum takeoff weight to empty weight ratio: 2.42
Thrust/weight: 1.12
Su-27S
Empty weight: 16380 kg
Loaded weight: 23430 kg
Max. takeoff weight: 30450 kg
Loaded weight to empty weight ratio: 1.43
Maximum takeoff weight to empty weight ratio: 1.85
Thrust/weight: 1.07
MiG-29
Empty weight: 11000 kg
Loaded weight: 15300 kg
Max. takeoff weight: 20000 kg
Loaded weight to empty weight ratio: 1.39
Maximum takeoff weight to empty weight ratio: 1.82
Thrust/weight: 1.09
Mirage 2000C
Empty weight: 7500 kg
Loaded weight: 15300 kg
Max. takeoff weight: 20000 kg
Loaded weight to empty weight ratio: 2.04
Maximum takeoff weight to empty weight ratio: 2.67
Thrust/weight: 0.7 (for loaded weight)
F-16C Block 30
Empty weight: 8570 kg
Loaded weight: 12000 kg
Max. takeoff weight: 19200 kg
Loaded weight to empty weight ratio: 1.37
Maximum takeoff weight to empty weight ratio: 2.24
Thrust/weight: 1.09 (for loaded weight)
Question: Why from 3rd generation of jet fighters Soviet/Russian jet fighters are behind their Western counterparts in loaded weight to empty weight and maximum takeoff weight to empty weight ratios?