You can make Gas Turbines as heavy as you want it's a bit different when it comes to Fighter Airframes & jet engines that have to flyWhat stage is Iran at turbine metallurgy wise ?
4 years ago my dormitory mate , who was graduating in Mechanics of manufacturing and production field , talked about his scientific tour to MAPNA Turbine Engineering and Manufacturing Company (TUGA) located in industrial city of Karaj.
He told me about the manufacturing of a Superalloy blade being produced there which can be used in electric , nuclear , gas fueled power plants. 4 years ago!.
Our problem is not manufacturing engines or their high TECH requirements but the main problem is mass production of those engines coz it needs some years of financing. I meant we have built them many years ago. Overhauling the legendary & lovely Tomcats is a God dam GIANT AND BIG witness for you. The only remaining things of Tomcat is probably it's air-frame obviously it's other components should be changed after 40 years otherwise it was unable to fly.
A view of MAPNA company :
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Iran is already producing Gas turbines
There are different grades of titanium that Iran can not produce
There are different grades of carbine fibers that Iran cant produce
There are different grades of nickel that Iran can't produce
There are different grades of Aluminium-titanium composites that Iran can't produce
A Fighters Air Frame is it's most expensive part of a fighter aircraft mainly due to material costs
Iran chose the F-5 because of it's low titanium requirements & lower grade composite requirements
Iran today is producing gas turbines as complex as the MGT-30 which is far more complex in design than any turbojet engine in Iran's inventory
So yes metallurgy remains the main problem!