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Search took 0.02 seconds. Search: Posts Made By: markxengineerin
Forum: Deck hardware: Rigging, Sails & Hoisting 20-04-2024, 07:52
Replies: 58
Views: 6,659
Posted By markxengineerin
Re: Dyneema Thermal Expansion - Enough to Break Things?

It has been difficult for me to study the impact of temperature on my dyneema rig, because I've mostly been moving from warm climates to colder climates, where any reduction in tension could be...
Forum: Construction, Maintenance & Refit 17-04-2024, 12:36
Replies: 5
Views: 407
Posted By markxengineerin
Re: Standing rigging re-rig

It's what every boat with dyneema rig and roller furling does, perfectly normal.
Forum: Plumbing Systems and Fixtures 17-04-2024, 04:01
Replies: 16
Views: 737
Posted By markxengineerin
Re: EcoTec watermaker help needed.

Were the o rings replaced with the exact ones required from the manufacturer, or from an o ring kit or diy measurements? Any chance the o ring grooves or mating surfaces where scratched? Plastic...
Forum: Plumbing Systems and Fixtures 16-04-2024, 17:13
Replies: 16
Views: 737
Posted By markxengineerin
Re: EcoTec watermaker help needed.

Simple things first, are you sure the sensor is accurate/ does the water taste different?
Forum: Engines and Propulsion Systems 16-04-2024, 07:32
Replies: 8
Views: 409
Posted By markxengineerin
Re: Yanmar 4JH2-HTE Turbo and Intercooler Replacement

To test, fill with pressurized air, up to the boost pressure. If not sure, I'd use 10psi, standing away from any plugs that may fly off and hit you. Watch for leaks w/ soapy water or dunk it into a...
Forum: Engines and Propulsion Systems 15-04-2024, 18:07
Replies: 8
Views: 409
Posted By markxengineerin
Re: Yanmar 4JH2-HTE Turbo and Intercooler Replacement

Sounds like a good question to ask about the intercooler. They are not highly stressed and I don't think i've ever heard of one being replaced other than from a car accident or to upgrade to...
Forum: Engines and Propulsion Systems 15-04-2024, 17:35
Replies: 8
Views: 409
Posted By markxengineerin
Re: Yanmar 4JH2-HTE Turbo and Intercooler Replacement

I have rebuilt a 4JH2E (non turbo version) and done plenty of turbocharger work on car engines. Turbo work often involves broken/seized fasteners due to the heat cycling, so perhaps consider if...
Forum: Plumbing Systems and Fixtures 14-04-2024, 18:55
Replies: 12
Views: 496
Posted By markxengineerin
Re: Bilge pump discharges

Or add a dedicated alarm (or two!) that go off a couple inches above the normal float switch. That way they only go off when something is very wrong and the alarm is justified. I think it's one of...
Forum: Propellers & Drive Systems 14-04-2024, 18:52
Replies: 65
Views: 4,814
Posted By markxengineerin
Re: Change a Dripless Shaft Seal while in the Water?

Been there, had same experience, although in the USA. Glad it worked out for you!
Forum: Deck hardware: Rigging, Sails & Hoisting 14-04-2024, 18:50
Replies: 6
Views: 426
Posted By markxengineerin
Re: Measuring rig tension

Or ebay. I got my "tension meter" for $15 on ebay. It was a very expensive model used for the cell phone tower industry, but no market for them so they go cheap. I had to calibrate myself, but...
Forum: Construction, Maintenance & Refit 14-04-2024, 18:48
Replies: 31
Views: 1,855
Posted By markxengineerin
Re: Which digital caliper to buy?

.010" is 10x less accurate than a decent caliper should be. These are my favorite https://www.amazon.com/Mitutoyo-Advanced-Absolute-Digital-Caliper/dp/B00WMKUUAQ although probably would not...
Forum: Electrical: Batteries, Generators & Solar 07-04-2024, 11:22
Replies: 167
Views: 12,457
Posted By markxengineerin
Re: Open Source Arduino Alternator Regulator

Victron VeDirect only outputs new battery voltage/current/state of charge readings at 1hz. This is going to significantly limit the speed of the PID loops used in the regulator. I'm debating if...
Forum: Propellers & Drive Systems 07-04-2024, 05:01
Replies: 65
Views: 4,814
Posted By markxengineerin
Re: Change a Dripless Shaft Seal while in the Water?

After seeing your video, I understand your boat has a strut holding the cutlass bearing. But for many (most?) boats, the cutlass bearing is in the hull and presents a restriction to any water trying...
Forum: Propellers & Drive Systems 06-04-2024, 16:01
Replies: 65
Views: 4,814
Posted By markxengineerin
Re: Change a Dripless Shaft Seal while in the Water?

Y'all are way too conservative. Even without plugging the gland with anything, water does not come in that quickly through a normal cutlass bearing, easily something a bilge pump can keep up with...
Forum: Plumbing Systems and Fixtures 06-04-2024, 15:57
Replies: 8
Views: 526
Posted By markxengineerin
Re: Spectra Cape Horn PPM

I do not know, but putting a cooling fan/cooling fins on your pumps seems like a good solution if they're getting to hot, rather than accepting 475PPM. I know some Spectras came with both of these,...
Forum: Construction, Maintenance & Refit 06-04-2024, 15:54
Replies: 109
Views: 8,419
Posted By markxengineerin
Re: Docking long keel/heavy displacement yachts.

Notice how the docking videos are in dead calm/no current. This isn't an option a lot of times. I vote YES adding a bow thruster if you think you need one. I am also thinking about a...
Forum: Plumbing Systems and Fixtures 02-04-2024, 10:59
Replies: 8
Views: 531
Posted By markxengineerin
Re: Which watermaker

Re ease of installation , fair enough, but the PPM out should have nothing to do with the brand. As long as you have the right pressure, the right recovery ratio, and a working membrane, I think you...
Forum: Atlantic & the Caribbean 02-04-2024, 10:50
Replies: 41
Views: 3,301
Posted By markxengineerin
Re: Bahama sailing newbie

There are plenty of people who only cruise for a season, then store the boat on land somewhere until the next year. If you have the money, it's an option. You'll find minor things need attention...
Forum: Atlantic & the Caribbean 02-04-2024, 10:01
Replies: 41
Views: 3,301
Posted By markxengineerin
Re: Bahama sailing newbie

I think it would be cheaper and easier to Air B+B or do some kind of house-trading arrangement.

I did the vanlife thing before sailing, so I can compare the RV lifestyle to boating. Boating is...
Forum: Plumbing Systems and Fixtures 02-04-2024, 09:25
Replies: 8
Views: 531
Posted By markxengineerin
Re: Which watermaker

Have you spoken to them about this? Relatively few things can affect the PPM output, so it shouldn't be hard to debug and bring that down lower. I would start with looking at the pressure.. 400...
Forum: Atlantic & the Caribbean 02-04-2024, 09:18
Replies: 41
Views: 3,301
Posted By markxengineerin
Re: Bahama sailing newbie

What is your (and your wife's) sailing experience?

There is a lot of "crap" to put up with, living on a boat, and enjoying the sailing part is a good % of why all the crap is worth it, to many...
Forum: Powered Boats 01-04-2024, 11:41
Replies: 24
Views: 2,868
Posted By markxengineerin
Re: Mounting Starlink antenna

Same same. I didn't find disabling the motors to make any difference in this regard. I finally did it and was disappointed with the results.
Forum: Electrical: Batteries, Generators & Solar 01-04-2024, 08:55
Replies: 167
Views: 12,457
Posted By markxengineerin
Re: Open Source Arduino Alternator Regulator

What I'm proposing is very similar:
Bulk stage: the alternator is adjusting to a current setpoint (measured at alternator output), until "bulk" voltage level is reached (at the battery). During...
Forum: Electrical: Batteries, Generators & Solar 01-04-2024, 04:04
Replies: 167
Views: 12,457
Posted By markxengineerin
Re: Open Source Arduino Alternator Regulator

Sorry my post was unclear. At 14.5V I have been manually turning the regulator off, and turning it back on when I want to re-start a bulk cycle. Requiring manual input is obviously a pain, so...
Forum: Electrical: Batteries, Generators & Solar 31-03-2024, 16:49
Replies: 167
Views: 12,457
Posted By markxengineerin
Re: Open Source Arduino Alternator Regulator

Yes that could be a default suggestion, but it's going to be different for every alternator. The best would be to make it "smart" so that it learns the most aggressive feed forward table over time,...
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