Since there will be tons of news recently about the
TTHB - TN-FAC and leading to an information pollution leaving the latest updates on the project;
I have been telling about how MPAC was actually an interim product of TN-FAC's design process, since it is first revealed in IDEF'21 August, in other words we may call it as an early form of the TN-FAC based on the earlier requirements and converted into a product of the STM. Of which, requirements were defined again by the TN as 2nd Phase of the concept design, as known as Contract-Functional Design, had begun.
I also have listed the differences in the requirements earlier, just recapping;
- relaxation of the maximum speed,
- a more efficient drive on the economical speed,
- better sea-keeping features,
- additional space for crew (a whole new deck),
- additional space for future upgrades (weapons-sensors-countermeasures),
- additional space for EW equipment,
- additional equipment on the mast, thus resulting in an integrated mast,
- changing power pack from COGAG to CODAG*.
Thus, TN-FAC project will conclude in 3 different designs,
MPAC as a platform satisfying the earlier requirements set in the beginning of the 2nd Phase,
TTHB-1 as a platform satisfying current requirements and thus including refinements on
MPAC,
TTHB-2 as a platform satisfying current requirements with alternative subsystems.
Both MPAC and TTHB-2 eyes the export market,
TTHB-1 aims the TN inventory.
(GT = Gas Turbine, DE= Diesel Engine, WJ= Water jet)
Reviewed options for the main propulsion, so far covers;
*COGAG-1= As 4 GT, 2 GT drives the medium WJ (booster) and 2-each GT driving the side WJ(steerable).
*COGAG-2= Or as 3 GT, each running single WJ.
*CODAG-1= 2 GT drives the medium WJ via combined gear and 2-each of the DE driving the side WJ.
*CODAG-2= 2 GT + 2 DE connected to a main gearbox which can couple-decouple any WJ, thus any single engine may power the entire ship.
Further notes on the design; MPAC or TTHB-2 has larger engine room, optionally can be configured with 2 DE + 2 DE with sacrifice of the maximum speed (35+ Knots) or 2 larger DE and without booster WJ resulting in a reasonable speed (25-30 Knots).
There is always option of the growth, any of these platforms can be scaled up to 800-900 tons, the platform currently is
semi-planning hull form and up to a certain tonnage it remains as such.