Sineva
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The problem with this new engine being a toloue 4 is that those engines have a very prominent bulb at the front of the intakeSo we have a new Soumar variant, the Hoveyzieh.
Different engines and probably different dimensions.
My 2 cents?
Serial produced and matured Toloue family engines were selected to create a cost effective weapon (engine nacelle is longer).
Engine should be fixed and not internally carried before launch as ground launcher allows a simple large container.
The space likely has been used, since the CoG is manipulated anyway due to the different engine, so a extra tank might have taken the space. In turn the warhead may have been enlarged too.
So what would be the range penalty of such a Soumar/Kh-55? The switch from turbofan to turbojet would still result in a range of 1250km if we assume a 50% less efficient propulsion. Even more conservative estimation would still mean 600-800km.
So the remaining question is if they simply were not able to copy the Soviet mini turbofan, whether the production numbers of it are too low or whether the differences in production would result in so much higher engine cost that a Toloue based conventional weapon is simply the most efficient approach.
Now we have the Meshkat, the Soumar and the new Hoveyzieh... all probably Kh-55 based but different in some way.
Centainly is that if they manage to make such a Hoveyzieh at 1,5 times the cost of a Noor, it becomes a good new capability.
Another possible option is that since the drop down engine configuration isnt being used anymore,that they`ve kept the turbofan but redesigned the nacelle,perhaps with a more efficient intake and exhaust as the original drop down configuration basically limited that to just the engine with a very basic cowling.