LegionnairE
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In order to navalize the T629 I think more composite materials will be used, which is going to make the aircraft lighter than it would be.The T-629 will be only 500 kg heavier than the T-129. In return, engine power will increase proportionally. The best features of the T-129, namely agility and the ability to perform missions with high performance in the "High&Hot" environment, will be preserved on the T-629.
Since materials that will not be a problem to import are preferred, the TS-1400 engine is approximately 25-30 kg heavier than the LHTEC CTS 800 engine. However, it can produce 160 SHP more continuous power than the CTS 800 variant used in the T-129.
In the not too distant future, our material technology will reach the level of the materials used in the CTS 800. Then the TS-1400 engine also goes on a diet and is lightened by 25-30 kg.
It could end up just as light as T129 unless feature creep kicks in. (which it usually does)