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The idea of mixing powerplants (for maritime patrol aircrafts included, the P2 Neptune illustrated for example) is not a novelty.The only modern purposed built maritime patrol aircraft I can think of is the Japanese Kawasaki P-1. It is motorised by four high bypass turbofans especially developed for it.Talking about your solution and from my humble point of view, a single engine for cruising low and slow would be unsafe in case of engine problem, giving only a short amount of time before going feet wet.High bypass turbofans seem to give enough power and economy to avoid the complexity of two types of powerplants. But someone with real knowledge of motorisation may have a better answer.
The idea of mixing powerplants (for maritime patrol aircrafts included, the P2 Neptune illustrated for example) is not a novelty.
The only modern purposed built maritime patrol aircraft I can think of is the Japanese Kawasaki P-1. It is motorised by four high bypass turbofans especially developed for it.
Talking about your solution and from my humble point of view, a single engine for cruising low and slow would be unsafe in case of engine problem, giving only a short amount of time before going feet wet.
High bypass turbofans seem to give enough power and economy to avoid the complexity of two types of powerplants. But someone with real knowledge of motorisation may have a better answer.