BruceK
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My BW Velvet Drive Manual limits speed to "trolling speed" with one engine unused. Locked off, I suppose speed would not matter.
If you have a "get home" set up, a separate shaft/prop makes sense,as it covers drive train as well as engine failure. A saildrive unit, like an outdrive or leg, could be easier than a second shaft, though outdrives need maintenance. Mounting the gearbox underwater has always seemed odd.
If you have a "get home" set up, a separate shaft/prop makes sense,as it covers drive train as well as engine failure. A saildrive unit, like an outdrive or leg, could be easier than a second shaft, though outdrives need maintenance. Mounting the gearbox underwater has always seemed odd.