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CommonBlue

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About CommonBlue

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  1. I looked into the hybrid options, but I just don't think the technology is there yet to give me what I want. And, as you mention, it would be very expensive to swap everything out and add a massive generator. My diesels are extremely efficient and come in very handy in many situations. The "hybrid" approach I'm considering (moving the electric outboard on my dinghy to a mount on one of the transoms) costs far, far less money and gives me some redundancy in case one of my diesels acts up. I'm even considering adding another electric outboard to the other transom so I can maneuver the boat b
  2. Haha, yeah, probably. Cats are very sensitive to weight. There is more-often-than-not a braggy/snotty aspect to mentioning cool new toys. If you've somehow risen to the enlightened state of not wanting to show off your new bike, that's great. I'm truly happy for you. I have to confess I'm not there yet and do get a certain amount of pleasure showing off new toys. I also have found that there are at least a few others who find them as fascinating as I do, which makes it a worthwhile share. If, on the other hand, you're the kid who's jealous that you don't have the same new bike and
  3. The 4 kWh of panels will produce 15-18 kWh on an average sunny day. I get 10-12 kWh on an average sunny day just from my five 400 Wh panels on my arch that hangs off the back of the boat that, although flat, don't get any shading. Cats have many limitations, but space for lots of solar panels isn't one of them.
  4. I only run one engine when I'm trying to get to a windward destination under sail in moderate conditions. I'll run both engines if I just want to get somewhere faster when there is no wind or when I'm stuck out in nasty conditions trying to make my way upwind. Running one engine at 2200 for the extra 1-1.5 knots that makes my cat ride better and make better progress was just something I heard gives me better fuel economy instead of running both engines at, say, 1500 to get that same amount of propulsion (just a guess). I sometimes run the one engine at its optimal rpm (2700-2800) and, now th
  5. It will be a little precarious having the dinghy alongside with the boat sailing at 5 knots and the outboard wide open. I'm sure I can get one of my kids to do it. ;-)
  6. Although the occasions when I'm island hopping and using the outboard for the added propulsion will rarely involve my transoms submerging, I have no doubt that the engine will get very wet frequently. Fortunately it's IP67 waterproof which means it can be completely submerged in up to 1 meter of water for 30 minutes without water making its way in. One of the big reasons I like these engines.
  7. I have Yanmar 3YM30AEs (29 hp at 3200 rpms). The Yanmar manual has that same type of information you provided and it shows around 10 hp (2 in your attachment) at 2200 rpms. Your comment about the prop of the 6 kW outboard being optimized for a light tender--but not to push a heavy cat--makes sense and has me concerned. I know that people use similar sized electric outboards to push heavy displacement boats (very slowly), so it might be possible to swap out the propellor. Although not a very desirable thing to do prior to every trip, it's fairly simple and quick on the electric outboard com
  8. I am considering adding an engine mount to the transom of one of my 39' catamaran's hulls so I can move the electric outboard that is on my tender and (hopefully) get added propulsion when trying to sail to windward. Like most cruising cats, its performance is poor when trying to make my way to a windward destination under sail, particularly out in ocean waves. I generally run one of my diesel engines at around 2200 rpm, which, I believe based on the engine's manual, provides roughly 10 hp of propulsion. That added propulsion increases the boat's speed 1-1.5 knots which makes the boat ride m
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