by Troppo » Thu Jun 30, 2016 8:44 am
Phillip, that is an worthwhile comparison. Your estimate of my fuel consumption is good.
For the interest of our readers:
* Cruising: In 30 hrs Windchaser typically covers 150 nm. She easily sits on 5 knots, still water, not taking into account tides. Against wind and waves, there is reserve power left so I can increase throttle and maintain the 5 knots. However, for the sake of fuel economy I usually don't. If in a hurry with spare fuel, I do.
* Fuel consumption: From 120 litres, I would expect 150 nm and that is towing an 11 foot aluminium dinghy. In practice I don't use that much as I am conservative with fuel calculations and try to move with tides. Obviously if I was pushing the motor hard against strong winds and high waves I would use more.
* Noise: I was once on a 25 footer with well insulated diesel and I could hardly hear it even in the cabin. Another boat, the diesel rattled and thudded but I think probably a bit quieter in the cockpit than an outboard at full throttle. However, with Windchaser, I am often running the 2-stroke outboard motor at less than half throttle, it being a massive 18 hp and too big really, and I don't find it too noisy. Don't know how it compares to a 9.8 hp four stroke.
* Fuel storage: I run two fuel tanks, one lashed each side of the motor on the cockpit seats. When one tank gets almost empty, I don't stop the motor, just quickly unplug from the almost empty and plug into the full. The motor does not miss a beat. I carry spare 20 litre containers in the cockpit locker. Also I carry them on the cabin floor or starboard quarter berth. Only use the quarter berth if I can pack it so it does not tip over. The cabin floor is okay for storage when underway as the container can't fall anywhere. Most diesel motors have their fuel tank tucked away so less containers scattered around.
* My thoughts: In my situation with 35 nm to get out of the river to open sea, the outboard motor is far from ideal. As Phillip pointed out, the outboard uses much more fuel. Given that for any trip away, I carry 60 litres of fuel just to reach the sea, that becomes a challenge. On the other hand, the 2011 Tohatsu has performed faultlessly. I blew the fuse for starter motor one time when I hooked up the battery the wrong way and I had trouble starting after leaving the motor several months and the fuel-oil mix in the carby and hose became mostly oil as the fuel evaporated. Apart from that, the motor has always started easily, I often pull start it just for the heck of it as it kicks in before the cord has pulled fully out. The reliability is a major factor for me as in a previous boat the motor had numerous hidden problems from an owner who didn't service it properly and I ended up having to sell the boat. So, the outboard is not ideal but has its strengths and I have never had a drama with it. One of the reasons I share my experience is because I originally never bothered with any boat that did not have a diesel motor and I think my one-eyed approach meant I missed out on some good boats. I bought what turned out to be a dud as the diesel motor let me down then I bought Windchaser with an almost new outboard which has been great. So, I encourage people not to discount outboards on sailing boats as they can be a viable option.
troppo