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[83.245.236.220]) by smtp.gmail.com with ESMTPSA id h21sm7584733lfk.41.2018.11.22.14.42.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 22 Nov 2018 14:42:57 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Jonathan Morton In-Reply-To: <87tvk8byen.fsf@taht.net> Date: Fri, 23 Nov 2018 00:42:55 +0200 Cc: Dave Taht , Make-Wifi-fast Content-Transfer-Encoding: quoted-printable Message-Id: <3072D1F1-E054-4FA4-8581-6E8FBE154EE7@gmail.com> References: <1542820640.672319900@apps.rackspace.com> <748E800D-BAE4-46EA-B960-748A6E1F9EAC@gmail.com> <87tvk8byen.fsf@taht.net> To: Dave Taht X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Make-wifi-fast] Car tire tracking X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2018 22:42:59 -0000 > On 22 Nov, 2018, at 11:22 pm, Dave Taht wrote: >=20 > I've gone and looked at new motors, and in comparison they seem > impossibly fragile. I've also looked over the latest in electric > propulsion... but I cannot imagine an electric motor at this stage of > the game surviving 40 years in an aquatic environent. And the best > batteries are kind of a fire hazard. I do note that the recommended configuration for narrowboat hybrid = propulsion involves old-school wet-cell lead-acid batteries (with an = automatic watering system to reduce maintenance), a 10kW motor mounted = well above the propshaft on a belt drive, and no fewer than *three* = alternators hanging off the free end of the engine, one of which is = dedicated to the starter battery circuit; the other two can recharge the = main batteries while the mechanical drive pushes the boat along. The = hybrid circuit runs at 48V (so I think they're using two 24V alternators = in series), and there's a mains inverter hanging off that. One of the upsides to this setup is that there's loads of power to run = standard mains-power electric appliances in the cabin, instead of weedy = 12V models and/or LPG. The projected lifetime of wet-cell batteries is = about 10 years, which is better than the 3 years replacement interval = recommended for gel types; they can be recycled, and their materials = effectively remade into new batteries, when they do eventually go bad. The engine itself, in the example shown, is basically a converted Kubota = unit, normally associated with mini-diggers and the like. Yes, they're = still making new engines of the same basic simplicity; they meet = emissions regulations by paying careful attention to the injectors, I = think. Meeting US regulations (stricter than Euro) appears to require = reducing mid-range torque by a large factor, but that usually doesn't = matter in a marine application. The company apparently does seagoing versions of their engines as well = as those designed for canal and river boats: https://betamarine.co.uk/engine-selection-for-yachts/ > I don't know if I'll rebuild this motor or not, as finding a mechanic = or > shop willing to work on it has been impossible thus far. Fuel-oil mixing suggests worn piston rings to me, as that's the main = place the two meet. Any competent car or motorbike mechanic should be = able to do something about that, without invoking a complete rebuild. = Fuel *leaks* will just involve figuring out where the leak is, and = replacing either the joint or the pipe that's at fault; you may be able = to do that more easily while the engine's out of the hull. That's assuming the leak is in the supply/return system, not in the = high-pressure fuel circuit of the engine itself. I think older diesels = tend to use a common-rail system instead of unit injectors, so more of = the fuel system is at high pressure when running. - Jonathan Morton