The tested propulsion configuration in TRIPOD is considered a state-of-the-art
solution, which is technically very promising. It has a high potential in fuel
savings and emission reductions. Analysis of data obtained in model tests
determined improvements reached in energy savings of up to about 5 percent for
the retrofit scenario and 10 percent for the new building one.
Study of the viability of the new propulsion solutions is made also by
performing economical cost benefit analysis for the operation of the reference
ships. It was concluded that if the investment level can be brought down,
obviously in close cooperation with the relevant specialist suppliers,
ship-owners will be interested to explore further installation opportunities
especially in new-building projects of large container ships. In summary, the
real economic criteria to evaluate business proposals have to be applied to
each particular case, they vary from project to project, from business case to
business case and from market situation to market situation.
TRIPOD supports the EU policy for a better environment, in particular the
greening of surface transport. The technical developments proposed within the
project will enable more versatile and efficient propulsion systems.
Significant energy savings and consequently lower emissions are expected from
the application of TRIPOD implying cleaner environment. Energy recovery
concepts based on the counter-rotating propeller principle and in advanced tip
loaded propellers are the key factors to produce such effects. Additionally,
pod propulsion make it easier to implement the CRP philosophy avoiding
complicated mechanisms in the shaft, and permit more flexibility in defining
hull forms with more uniform wakes at the propeller plane.
The new propulsion system will make it possible to set as design goal
propulsion units of lower noise and vibration levels. Two main factors will
contribute to the reductions: smaller optimum diameter of the CRP unit as
compared to the original propeller (i.e. larger gaps between propeller and
hulls) and reduction of loading per unit area as a consequence of splitting
the propulsive load between two propellers. Noise/vibration attenuation both
improves the quality of life on board and reduces harmful impacts on the