Well, to chime in on this one, I have an inboard Yanmar
(8 hp) and an outboard Evinrude
(8 HP also, but with slightly smaller prop, just barely). Both props have three blades. The sailboat prop is non-feathering.
Now, the Yanmar
was not running when I bought the boat, I assumed it was dead and that I would have to remedy the situation at some date in the future by either fixing it or removing it for the additional storage
space that removal
would provide. The outboard is exceptional for a 2-stroke and as a long shaft design its prop is about precisely the same depth
as that of the inboards blades. I used the outboard exclusively on my trip up the ICW
from Daytona, and it did not fail me, not once. However...
There were multiple occasions when there was cavitation when I was dealing with wakes of other vessels. I can imagine that in open water with chop the outboard would quickly become rather cumbersome, but I also can honestly state the boat will turn in her length, pivoting on the keel
, in a tight space, and that is by far an excellent situation, given how tight the St. Augustine marina was for us to navigate (in high winds, with contrary currents with the tidal flow as we wound through a maze of mega-dollar yachts that cost more than any house I have ever set foot in, to include some pretty schmantzy houses).
The outboard was quite valuable and effective, though it did go through some fuel. I cannot state how the inboard compares in effective horsepower though, because my three inch fouled hull
still hit 5 plus knots with the outboard, and I am unsure if the inboard would have given more considering the state of hull
fouling we had for the trip. I will repost later when that is evaluated, after she is back in the water again. My theoretical hull speed
is under 7 knots, so I doubt the inboard would have given me much more than the outboard did in terms of speed.
The outboard was noisy. The inboard would likely be noisy as well, but I don't know how noisy it would be. Again, it was not running, and I only recently have gotten the cause of it's silence addressed, and am only now ready to bleed the system and attempt a start. I may do it Tuesday this week, in fact. We shall see.
I can also state that the outboard performed excellent second duty as a launch engine
, but the long shaft made it a little tricky on ramps because of the increased depth
, and also made it a bit difficult to steer the launch because of the geometry of force that long shaft offered in turns on a flat bottomed launch, and the horsepower was not terribly high, so the launch was almost planed but not quite, and would side-slip in turns easily. Still, beats swimmin' in gator infested waters!
I think I agree with the one that mentioned that the outboard was a good backup for the inboard which was itself a good backup for the sails
on a sailboat. That seems to be a reasonable evaluation and represents my own experience in this process. If I had an oar or two on board, I would be even happier, but I do have a galvanized ten foot long pole for poling off of docks and the like, so I suppose that will have to do for now. I don't have tons of room anyway, but the thought of pulling the inboard and selling it off so I can make better use of the space it currently occupies keeps entering my mind, until I consider how much "fun" would be experienced in choppy water along a stone jetty with an outboard that was cavitating in the lumpy soup.
I really need to get that Yanmar running....