Yellowstone":3oae133h said:
Les - Thanks for the update on the Marinault. Have a comment for you and the other designers and then a question. What I see certainly shows much thought and some interesting innovations, e.g. side saddle tanks and opened berth on port side. Question. The Marinault appears to accommodate only a single engine. Does the reliability of today's engines blend into that decision? Give us your thoughts. Thanks. John
Hi John,
I can't answer directly for Dave and Ben but I can tell you that while most designers/builders/dealers have that in the back of their mind I doubt it's "the" factor for making a decision about whether to accommodate one engine or two.
I think it's really a bend of the practicalities of the choices at hand. Almost everyone knows full well that a boat (and most other things in life!) is one floating set of compromises. In looking at the Marinaut from my perspective now I can see that choosing to have the motorwell accommodate twins would have impacted:
- the space allocated for batteries
- the space allocated for aux fuel tanks
- the space allocated for aft storage
- the dash (more space for more gauges)
- The helm seating area, and in particular the space needed for twin engine controls.
It would have also impacted the basic premise of what one thinks the boat is, or is to be, at the design stage. For instance, when you look at the transom area of the Marinaut there's not much doubt that water will stay outside the boat. Not only is there a full height forward motorwell bulkhead but the horizontal area (deck) around the motorwell is fully enclosed. There's not much volume in the single motor well so even a breaking wave dumping in it is not going to affect the boat very much.
Does that make a big difference? I don't know. From a practical standpoint you don't hear a lot about C-Dory 22's getting pooped but there's something to be said for what a transom like the Marinaut has lends to the psychology of perceived safety.
It also happens to look good (to my eye) and I'm sure that played a part as well.
In the long run I think it was mostly about simplicity (since several things on the boat would have to be quite different for twins), aesthetics, and the fact that modern outboards are very reliable.
Market wise, except for larger boats that need the horsepower, most outboard powered boats are single engine. In fact this is true of the C-Dory 22 as well although there are quite a few twin engine boats which is a bit of an anomaly.
From a technical perspective it's not proven that twin engines are safer or superior to a single engine; it's still very much a personal and subjective choice (except for cats and boats that need more horsepower than one engine can provide). For every situation where twins would win the day an opposite situation for a single engine being the better choice can be presented. It's really a no-win argument from a technical (objective) viewpoint. [Most serious long-range motor cruisers are single engine (many with a back up system); it's been shown for years that it's the most efficient way to go from a cost and maintenance perspective.]
The single engine only design of the Marinaut provides room for aux tanks (built-in or portable), or room to store fenders and lines and other items, and gives the cockpit a much larger "feel". It also meant the helm space could be more compact and along with no port side forward cabin bulkhead that lends the cabin a more open feel. With a couple of (throwable type) cushions the space to either side of the motorwell proves a couple of nice seats; that area also provides space to install a bait well if desired. All those things would have had to have been given up if the transom were opened up for twins.
Ultimately you take your best thoughts about how the boat will be used, who will use it, and what things you want to incorporate into the boat and make your best decision (as a designer) as to what will fit the best and how you can meet the most expectations. I think when most folks see the open space under the motorwell area in the Marinaut if you then asked them if they'd trade that space for the ability to have twin engines the answer would typically be "no". Of course that wouldn't be everyone's answer but I do personally feel after all the CD22s we've sold and rigged and repowered that at the end of the day it's not really a significant consideration for most folks. And most will fit an auxiliary bracket on the port side and carry a kicker for fishing and/or backup use.
Les