Larry,
A seasoned ferry pilot told me he hates to ferry twins across the water. He sums it up as "You have twice the chance of getting wet in a twin." Twins configured for ferrying won't fly on one engine.
These ferry pilots take off so far over gross (due to the extra fuel tanks) that the single engine service ceiling is *below* sea level. And this is the case the majority of the over water legs. Until the weight gets down to the certified gross ballpark, you won't have a postive rate of climb.
Anyway you slice it, overseas ferrying is not for the timid.
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