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Search: Posts Made By: Robert Jansen
Forum: General Sailing Forum 22-01-2021, 11:48
Replies: 202
Views: 13,809
Posted By Robert Jansen
Re: Americas Cup and simpler days

Call me old fashioned, if you must, but I would prefer to see a return to the days of match racing in displacement monohulls. When was the last time you saw a pair of AC75s in a tacking duel? Get...
Forum: Plumbing Systems and Fixtures 16-01-2021, 10:54
Replies: 55
Views: 3,858
Posted By Robert Jansen
Re: Using Generator Cooling to Heat Water

I did a quick search. see:


https://polarpower.com/products/generator-accessories/exhaust-heat-exchanger/


The solutions appear to be off the shelf.


This is just one of many results...
Forum: Plumbing Systems and Fixtures 15-01-2021, 23:42
Replies: 55
Views: 3,858
Posted By Robert Jansen
Re: Using Generator Cooling to Heat Water

The waste heat from engine exhaust is much hotter than heat transferred from the engine coolant, and warms up instantaneously for all practical purposes. It would be a far more efficient source of...
Forum: Plumbing Systems and Fixtures 15-01-2021, 11:42
Replies: 55
Views: 3,858
Posted By Robert Jansen
Re: Using Generator Cooling to Heat Water

One alternative comes straight from water heating solutions common to off grid housing: use the waste heat from the engine exhaust (main, genset, or both) as your primary source for heating water. ...
Forum: Electrical: Batteries, Generators & Solar 15-01-2021, 10:57
Replies: 48
Views: 4,635
Posted By Robert Jansen
Re: How can I waterproof a wire bundle passing through the deck?

Consider alternative solutions from industrial suppliers. If memory serves, there is a wide range of commercial and industrial products designed for applications needing waterproofing. The...
Forum: Product or Service Reviews & Evaluations 28-08-2020, 11:40
Replies: 89
Views: 5,755
Posted By Robert Jansen
Re: Tools: High Quality or Cheap and Replaceable

Over the years, I've only had one problem with good tools: they have a tendency to grow legs. Secure tool storage is not an option. Other than that, I have a simple attitude about buying tools: ...
Forum: Engines and Propulsion Systems 03-04-2020, 10:53
Replies: 92
Views: 7,075
Posted By Robert Jansen
Re: Yanmar 2qm20 not starting troubleshooting

Work through the glow plug system. There are any number of minor issues which can prevent the operation of the glow plugs. Start with the fuse. Next in order: the glow plug relay. Third (least...
Forum: Construction, Maintenance & Refit 30-03-2020, 11:00
Replies: 55
Views: 5,015
Posted By Robert Jansen
Re: Traces of diesel in the bilge

There's a trick that automobile mechanics use to isolate a leak that may help. Consider adding some dye to the fuel. The source of the leak should be easier to identify.
Forum: Off Topic Forum 10-02-2020, 10:50
Replies: 83
Views: 10,413
Posted By Robert Jansen
Re: Robertson vs Phillips headed screws

Robertson fasteners (and Torx and Allen heads and 12 point heads) all are used because they exhibit a reduced tendency to cam out (the tool stays put while you are driving the fastener home). This...
Forum: Electrical: Batteries, Generators & Solar 07-10-2019, 10:51
Replies: 43
Views: 6,302
Posted By Robert Jansen
Re: Ultracapacitors parallel to houe battery.

Years (actually decades) ago, I had an interesting conversation with a couple of electrical engineers who were working on improving the starting effiicency of electrical motors. Their solution was...
Forum: General Sailing Forum 04-10-2019, 10:40
Replies: 176
Views: 34,629
Posted By Robert Jansen
Re: Power draw of Nespresso type coffee machine.

Here's a simple way to clean up the output waveform from a non-true sinewave inverter: add an isolation transformer. It's an old trick used back in the analog days when you wanted a separate AC...
Forum: Engines and Propulsion Systems 27-09-2019, 10:38
Replies: 104
Views: 5,139
Posted By Robert Jansen
Re: Oil leak from valve cover

If the leak is in the same place after replacing the gasket, and assuming that the replacement was performed in a reasonably competent manner (after all, it's not rocket science), a warped valve...
Forum: Seamanship & Boat Handling 30-08-2019, 12:07
Replies: 66
Views: 12,324
Posted By Robert Jansen
Re: The Rogue wave and the sailor

The physicist in me informs me that rogue waves cannot arise without some form of contructive interference. This imples that they are more likely to arise wherever there is a convergence of two or...
Forum: Construction, Maintenance & Refit 23-08-2019, 09:42
Replies: 40
Views: 7,868
Posted By Robert Jansen
Re: Circle Cutter - any tricks to cut plastic ?

If you can find it (it shouldn't be that difficult), I would recommend using abrasion resistant lexan over acrylic.


If you don't want the (unsightly) indentation at the origin, consider making a...
Forum: Liveaboard's Forum 13-05-2019, 10:10
Replies: 110
Views: 12,092
Posted By Robert Jansen
Re: In a marina, what food items can / cant be thrown overboard

There's an old joke about a kid whose Dad taught him to swim by rowing out into the middle of the lake and throwing him overboard. When a friend of his asked him about the distance of the swim back...
Forum: Multihull Sailboats 15-02-2019, 10:26
Replies: 54
Views: 5,607
Posted By Robert Jansen
Re: Seized Allen Bolt Removal - Your Method?

A soldering gun or iron is a good alternative for point source application of heat. I have used both with success removing allen screws secured with red loctite. If a power source is unavailable or...
Forum: Engines and Propulsion Systems 08-02-2019, 11:14
Replies: 32
Views: 4,400
Posted By Robert Jansen
Re: Engine went full RPM....now doesn't start

When a diesel engine runs away, it's been my experience that there is a blow by problem (rings, typically, but could also be valve guides), and the lubricating oil is feeding into the combustion...
Forum: Engines and Propulsion Systems 01-02-2019, 10:06
Replies: 64
Views: 7,860
Posted By Robert Jansen
Re: repowering my sailboat- engine selection

Why not consider dragging yourself kicking and screaming into the 21st century and install a hybrid system? It will be much more energy efficient, and you'll get a genset and upgraded battery banks...
Forum: Monohull Sailboats 24-09-2018, 09:52
Replies: 70
Views: 9,012
Posted By Robert Jansen
Re: Replace inboard engine with two outboards?

Have you considered an electric outboard? It will be quieter and more efficient than a gas outboard. You can install a (diesel) genset and a battery bank in the space previously occupied by the old...
Forum: Construction, Maintenance & Refit 03-09-2018, 09:06
Replies: 97
Views: 10,068
Posted By Robert Jansen
Re: Drilling through stainless steel

First, locate an industrial hardware store. Don't even bother to try to find what you need at a lesser institution. Purchase carbide bits and request advice on which cutting fluid to use (you'd be...
Forum: Electrical: Batteries, Generators & Solar 31-08-2018, 09:00
Replies: 70
Views: 9,096
Posted By Robert Jansen
Re: propshaft driving an alternator , when sailing

If I remember my engineering formulae correctly, you will maximize the power such an arrangement can generate if the propshaft spins at half of free speed when driving the alternator under load.
Forum: General Sailing Forum 24-06-2015, 16:58
Replies: 109
Views: 55,949
Posted By Robert Jansen
Re: Myth: Hull Speed

Hull speed is a myth, but not for the reasons typically set forth in the various arguments. Let me offer a different perspective.

Beginning with the accepted definition of hull speed for a...
Showing results 1 to 22 of 22

 
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