by Troppo » Thu Mar 29, 2012 10:00 am
Hi Miles, I just bought a Top Hat on the weekend and have thought a lot about the inboard vs outboard issue. Here's my limited experience: My previous boat, 27 footer, had a 10 hp diesel inboard. The motor looked good but, so I found after buying, had seriously been neglected and abused. Stupid abuse such as the bleed screw on the fuel filter being stripped then held in with loctite. With hidden problems like that emerging, costs escalated to the point where I sold the boat. If the motor had been good, the benefits to me would have been the easy start, a fuel I prefer instead of petrol[bit of farming background where everything had diesel motors except the chainsaw : )], works in any weather, and cockpit had plenty of space.
On the negative side, it was noisy in the cabin since it had no insulation and I could not hear the two-way radio, diesel fumes in cabin as little leaks in fuel system, space taken up inside by motor. Another disadvantage was that I found even a few barnacles on the propeller dropped the speed by at least half and I had to jump into croc-infested water to try and scrap them off. Speed went from 2.5 knts to 5.5 knts.
The negatives could have been overcome by more money but I was bleeding dry with the away-from home mooring fees and the repetitive costs of travel up to the boat only to have to do more repairs and come back later when ordered parts arrived.
The Top Hat I just bought has a almost new outboard. The benefit is that even if I wanted to replace it, it is so much cheaper than a diesel it is not funny. One of the costs of a new diesel motor is getting it fitted and having the shaft aligned properly. None of that with an outboard. For repairs, I can take the outboard to a mechanic which is more cost efficient than taking the mechanic to the boat.
My new Top Hat has the outboard motor in the cockpit. The benefit is that it is easy to reach and in rough weather there is less chance of the propeller coming out of the water. There is also a heap of useful space in the cabin behind the companionway ladder which I am glad to have. The disadvantage is that half the cockpit has gone and the motor is close to my ears. Another disadvantage is that petrol is more flammable and so I will need to be extra careful with it. Lifting the motor up when moored is a nuisance and despite chaining it, someone could steal it.
In short, from my experience, as far as motors go, I would prefer a well-looked after diesel to a petrol outboard but the choice is not just about a motor. I value the extra space in the cabin as I like cruising where I pack in drums of fresh rainwater etc. And outboards are pretty robust and may be a sound economical choice [I could have bought 2 new outboards for the cost of repairing the diesel in my previous boat.] I am happy my new boat has an outboard and I am keen to just sail the boat and use the motor as least as possible, after all, it is not a motor boat.