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. 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.
#Yanmar 8 hp outboard forum manual#
The Yanmar manual has that same type of information you provided and it shows around 10 hp (2 in your attachment) at 2200 rpms. I have Yanmar 3YM30AEs (29 hp at 3200 rpms). I been assuming that applying roughly the same amount of horsepower from my electric outboard that I've been applying with one of my diesels running will produce about the same 1-1.5 knots of added speed, but I suspect I may be missing something and find that my electric outboard's 10 hp is doing next to nothing in terms of added propulsion, and instead is just wasting my precious battery reserves. My catamaran will sail close hauled at about 5 knots in 12-15 knots of wind. I also know from experience sailing a fast trimaran that if the boat's gas outboard is pushing the boat and then the sails take over with the engine still running, the engine revs much higher due to the reduced load and doesn't do anything to increase the speed of the boat after the boat speed reaches around 7 knots. This would be preferable to me because I'd like to eliminate the noise and exhaust of the diesel when I'm going from one place to another and I'd like to minimize visits to marinas in foreign ports where the fuel quality is questionable.īefore I drill holes in the transom of my catamaran to add the engine mount, it occurred to me that I should get input from those more knowledgeable than I am about physics and electric engines and possibly even those who have tried something similar. I could continue to do that, but have upgraded the boat with a considerable number of solar panels (4 kW) and a large lithium battery bank (45 kWh) (to enable my wife, me and our guests to have air conditioning without having to run a generator) and it occurred to me that my 6 kW electric outboard might be used to provide the added propulsion that my diesel was providing. That added propulsion increases the boat's speed 1-1.5 knots which makes the boat ride much better through the waves and obviously gets me to my destination faster. 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. 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.
0 kommentar(er)
