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Forum: Power Systems Today, 07:41 AM
Replies: 6
Views: 230
Posted By DavidM
Extending the riser so it is at least 12" above...

Extending the riser so it is at least 12" above the water line is one solution, but there may not be room and it is expensive. But it is what I did on my MS Pilot 34 and solved the problem.

But...
Forum: Boating Safety and Concerns 08-14-2022, 05:44 AM
Replies: 14
Views: 555
Posted By DavidM
This is often caused by lead sulfate settling on...

This is often caused by lead sulfate settling on the bottom and shorting out a pair of plates in a cell. Then the cell voltage jumps from 2.1 (12.6/6) per cell to 2.5 (12.6/5) and starts boiling...
Forum: General Maintenance 08-13-2022, 09:40 PM
Replies: 6
Views: 302
Posted By DavidM
Ethylene glycol is the base for most engine...

Ethylene glycol is the base for most engine antifreeze but because it is toxic, propylene glycol is used to winterize potable water systems. Ethylene glycol is somewhat more effective at increasing...
Forum: General Discussion 08-12-2022, 12:56 PM
Replies: 28
Views: 1,080
Posted By DavidM
Yes, Fred was definitely a one-of-a-kind old...

Yes, Fred was definitely a one-of-a-kind old school sailor. I was often frustrated by that approach as I thought it was a failure not to look at the problem from a modern tech point of view. But Fred...
Forum: Financial Matters and Red Tape 08-12-2022, 10:41 AM
Replies: 2
Views: 179
Posted By DavidM
First read your agreement with the surveyor. In...

First read your agreement with the surveyor. In general unless specifically restricted by the agreement, a professional document is a work for hire and is the property of the person who paid for it...
Forum: Electrical and Electronics & Navigation 08-09-2022, 03:59 PM
Replies: 9
Views: 284
Posted By DavidM
Are just the outlets on the galley side out or...

Are just the outlets on the galley side out or both sides? Do other 110V things like the A/C work?

David
Forum: Electrical and Electronics & Navigation 08-09-2022, 10:20 AM
Replies: 14
Views: 535
Posted By DavidM
I don't know where you got the 120 Ah spec for...

I don't know where you got the 120 Ah spec for the Yanmar starting battery. The only spec that is meaningful for a starter is the CCA or MCA rating.

David
Forum: Other Trawler Systems 08-09-2022, 10:17 AM
Replies: 24
Views: 1,023
Posted By DavidM
Frost free usually is not available on Danfoss...

Frost free usually is not available on Danfoss compressor marine fridges because the heating element that melts the frost consumes a lot of energy.

David
Forum: Other Trawler Systems 08-09-2022, 05:50 AM
Replies: 24
Views: 1,023
Posted By DavidM
There is usually a big difference in DC power...

There is usually a big difference in DC power consumption between a 12V Danfoss compressor fridge and a big box, non Energy Star rated AC compressor fridge running off of an inverter. From what I...
Forum: Electrical and Electronics & Navigation 08-08-2022, 02:47 PM
Replies: 14
Views: 535
Posted By DavidM
The Yanmar 6LP was originally developed by Toyota...

The Yanmar 6LP was originally developed by Toyota for use in their Landcruiser. So I bet they didn't use a 4D or 8D to start it. I am guessing here that normal starting current is 500 or so amps and...
Forum: General Discussion 08-08-2022, 02:02 PM
Replies: 52
Views: 1,638
Posted By DavidM
I assume that you are wanting fuel consumption...

I assume that you are wanting fuel consumption data in a fairly narrow range, say 60% of full displacement speed up to 120%. There are several direct ways of doing this as have been discussed above...
Forum: Electrical and Electronics & Navigation 08-08-2022, 10:18 AM
Replies: 14
Views: 535
Posted By DavidM
A lot depends on the length of each run, what...

A lot depends on the length of each run, what kind of engine you have which will tell how much current it takes to start and other factors.

1/0 sounds small to me.

BTW you must be a tough guy...
Forum: Anchors and Anchoring 08-06-2022, 04:06 PM
Replies: 29
Views: 942
Posted By DavidM
If you do end up replacing the chain, and my...

If you do end up replacing the chain, and my guess is about 50/50 that it is the wrong size for the gypsy I would upgrade the chain. BBB chain is a common type and is made from normal tensile...
Forum: Electrical and Electronics & Navigation 08-05-2022, 06:13 PM
Replies: 9
Views: 284
Posted By DavidM
It may be that a GFCI has tripped. There is a...

It may be that a GFCI has tripped. There is a GFCI outlet on the bow side end of the galley and it serves all outlets on that side through a main panel breaker. All outlets downstream of that one...
Forum: Marinas, Anchorage, Harbors, Slips and Storage 08-05-2022, 02:13 PM
Replies: 2
Views: 161
Posted By DavidM
Hurricane Boatyard is probably the cheapest...

Hurricane Boatyard is probably the cheapest option just outside of Bayboro, NC. They have in the water or on the hard storage capability.

David
Forum: General Discussion 08-03-2022, 10:10 AM
Replies: 8
Views: 789
Posted By DavidM
I suspect your charge controller is only using...

I suspect your charge controller is only using battery voltage to infer state of charge. It is wildly inaccurate depending on battery use and charging. The data you showed above is entirely...
Forum: General Discussion 08-01-2022, 03:10 PM
Replies: 6
Views: 279
Posted By DavidM
If they were fine charged and connected then...

If they were fine charged and connected then disconnected and slowly discharging should also be fine.

David
Forum: General Discussion 08-01-2022, 10:01 AM
Replies: 117
Views: 2,610
Posted By DavidM
Back some years ago, this question was debated...

Back some years ago, this question was debated here extensively. I remember Jeff Siegel, then the owner/founder of ActiveCaptain, advocating for dumping paper charts.

With a good chartplotter and...
Forum: Boats | Wanted 07-31-2022, 05:55 AM
Replies: 3
Views: 324
Posted By DavidM
I went through something similar many years ago...

I went through something similar many years ago with two cruising sailboats. I got my choice. Big mistake. Listen to Wifey.

David
Forum: General Discussion 07-29-2022, 05:15 PM
Replies: 29
Views: 2,337
Posted By DavidM
I wouldn't be so sanguine about 4 oz of bleach...

I wouldn't be so sanguine about 4 oz of bleach mixed with your fuel. Bleach is sodium hypochlorite (hey I am a retired chemical engineer) and I suspect it could react with some of the additives that...
Forum: General Discussion 07-29-2022, 01:35 PM
Replies: 12
Views: 789
Posted By DavidM
Here is a way to figure fuel consumption for...

Here is a way to figure fuel consumption for almost any boat, at hull speed:

First use the displacement to figure the hp required at hull speed. For full displacement boats, it is about 2 hp per...
Forum: General Maintenance 07-25-2022, 06:13 PM
Replies: 15
Views: 848
Posted By DavidM
He says wot is 3450 rpm. The rated rpm is 3300....

He says wot is 3450 rpm. The rated rpm is 3300. 3450 sounds like plenty.

David
Forum: General Maintenance 07-24-2022, 02:27 PM
Replies: 15
Views: 848
Posted By DavidM
I had a Mainship Pilot 34 with the higher hp...

I had a Mainship Pilot 34 with the higher hp version of that engine, the 6LY STP 370, but low rpm performance should be about the same as your engine.

I required about 1,600 rpm to get to 7.2 or...
Forum: Power Systems 07-24-2022, 11:06 AM
Replies: 5
Views: 243
Posted By DavidM
Any generic oil filled pressure gauge should...

Any generic oil filled pressure gauge should work, but if you want one specifically for turbo boost, this one looks pretty good: ...
Forum: Other Trawler Systems 07-22-2022, 11:26 AM
Replies: 1
Views: 218
Posted By DavidM
I think I found the A/C you are considering on...

I think I found the A/C you are considering on Amazon:...
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