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Mig 21BIS version vs Mig 21 F13
The mig 21 hold the title of the most produced supersonic jet fighter ever as 11500 were built.The mig entered service in 1959 and today after 60 years is still flying and used operationally by several airforces. Some users upgraded it with new and modern avionics and radar. One example is the Indian Mig 21Bison with more than a hundred still serving with the IAF.
The comparision here is between the earlier and one of the latest Mig 21.
The f13 early type was also called fishbed C and was used mainly as a day fighter as local interceptor capable of mach 2.0. The main weakness of the type was the short range , 2 points only under the wings and basic radar.
The BIS had many improvements : nuch more powerful engine , 4 wing pointes, the dorsal dorsal spine was enlarged and was able to carry much more fuel. The radome cone was much bigger for housing much better radar for all weather.
The duct for air in the front was enlarged for the higher thrust engined and length graw by some 50 cm if we exclude the pitot tube in the front.
Attached images of the two side by side.
Yair
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