What is the "rate of failure" of a large clam-crusher? Is a failure a stoppage or a catastrophic? Let's guess and say one stoppage every 2000 hours. For most of us dedicated cruisers, that could be once in 20 years. Does the failure happen at the first 100 hours or at the 2100th? It's logical that if we assume that the "rate of failure" is largely meaningless, it's also reasonable to assume 2 engines have twice that rate, which is also meaningless.
I like singles, there are definitely maneuvering challenges, but that just makes it interesting instead of just driving your Toyota on narrow streets.
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Don't believe everything that you think.
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