[quote name='Raj Malhotra' date='13 November 2010 - 01:52 PM' timestamp='1289636074' post='109221']
Re Arun
My layman understanding is that if we use a 10-15% more powerful engine the fuel consumption will also go up by 5-15% even if we dont use the full power because deceasing thrust while flying does not decrease fuel consumption of turbines in same proportion as the SFC goes up. On the other hand LCA contemplated Kaveri while GE might be more fuel efficient engine??).[/quote]
Recall that bigger thrust is comign from an engine whose core is bigger(to deliver the power) that invariably also has bigger bypass flow, meanign more efficiency in normal day to day flying. Hence my thought that it will have better SFC.
I beg to differ.
LCA -2 that is bigger in wing span, longer, lesser wave drag and different internal fuel load and weapons load hard-point, is from a controls perspective a different beast and extensive flight control test need to done to open teh envelop. Yes hardware development is not that much different but flight testing regime will be repeat of LCA-1.
Re Arun
My layman understanding is that if we use a 10-15% more powerful engine the fuel consumption will also go up by 5-15% even if we dont use the full power because deceasing thrust while flying does not decrease fuel consumption of turbines in same proportion as the SFC goes up. On the other hand LCA contemplated Kaveri while GE might be more fuel efficient engine??).[/quote]
Recall that bigger thrust is comign from an engine whose core is bigger(to deliver the power) that invariably also has bigger bypass flow, meanign more efficiency in normal day to day flying. Hence my thought that it will have better SFC.
Quote:But inspite thereof, ii seems from Subramanium PD-ADA commnents that they are NOT contemplating major (or even any) changes to fuselage, wing etc compared to comments of HAL or PRajkumar. I think that they-ADA will put in a powerful engine with change of intakes and take it up from there. Perhaps that is why we have not seen any diagrammatics of changed LCA Mark-2 because there ain't any.
I beg to differ.
LCA -2 that is bigger in wing span, longer, lesser wave drag and different internal fuel load and weapons load hard-point, is from a controls perspective a different beast and extensive flight control test need to done to open teh envelop. Yes hardware development is not that much different but flight testing regime will be repeat of LCA-1.