Search found 1351 matches

by kmorin
Tue Jul 10, 2018 3:52 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

The outside of the same bracket/strap piece is shown below. Strain Crack_6.jpg IF Capt'n Dave's tank bend looked like this ??? then we can suppose that the region was susceptible to accelerated corrosion in the cracks' valleys shown above? If these regions are also not the same as the original paren...
by kmorin
Tue Jul 10, 2018 3:46 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

This bracket was found in the extra's pile and is included to show the inside and outside of a too tight bend. Inside this bend is a line where the knife edge of a steel type nose bar pushed down on this strip of 1/4" (alloy unknown). Strain Crack_5.jpg the line in the bottom of the bend area was fo...
by kmorin
Tue Jul 10, 2018 3:43 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

Next is another piece from the same anchoring chocking and rode handling system on the river rowing dory. Another piece at a different location- but the damage here is more severely cracked with more pronounced ridges. strain crack_2.jpg This bracket shows obvious surface cracks: the potential for c...
by kmorin
Tue Jul 10, 2018 3:39 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

Next is another piece I found on a bracket in a rowing river dory- the bracket is bolted to the gunwale and is not part of the builder's original equipment as near as I can tell? strain crack_1.jpg this 3/16" or 1/4" bracket was bent so the outside of the bend is rough and ridged like the 1/8" piece...
by kmorin
Tue Jul 10, 2018 3:35 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

Closing in on the image above- due to photo/site handling file difficulties I'm posting these all in one post each. Not sure what's happened to the photo handling? But Photobucket sure has become less than helpful!! The site also is acting odd- so will try to post images one at a time? Closing in on...
by kmorin
Tue Jul 10, 2018 3:32 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

I mentioned that Capt'n Dave's tank may have failed along a bent corner because in the video above at approximately 17:00+ Dave shows the deterioration of the bent corner material. He actually pushes his pocket knife blade through the tank's bent corner because the parent metal has become so corrode...
by kmorin
Sun Jul 08, 2018 4:36 pm
Forum: Alloy Shop Talk
Topic: Pacific boat fuel tank, lasted only 11 yrs.
Replies: 14
Views: 1123

Re: Pacific boat fuel tank, lasted only 11 yrs.

Recently I've been involved with new projects and the subject of bending aluminum has become front and center. I'm bumping Capt'n Dave's thread on his tank to suggest that his video may show the tank was bent incorrectly? AND most importantly; the incorrect bending radii of the tank corner seam- cou...
by kmorin
Thu Jul 05, 2018 1:18 am
Forum: Alloy Boat Forum
Topic: Aluminum hartop frame
Replies: 5
Views: 223

Re: Aluminum hartop frame

Skiffing, no one is going to have a 'bolt together' top kit for your boat . You may be able to tolerate a series of aluminum scaffolding parts - and make do?- but it will never be the same level of cosmetics that a welded tower/cover frame will provide: you may accept the various cast fittings on th...
by kmorin
Tue Jul 03, 2018 4:54 pm
Forum: Alloy Boat Forum
Topic: Who Does A Marine Survey Matters
Replies: 3
Views: 112

Re: Who Does A Marine Survey Matters

building a welded aluminum boat is a bit more work in terms of "supply chain" than cellulose or plastic because there are many more suppliers of hardware, fixtures and fluid connectors for the previous two hull material types than for welded aluminum boats. As a result; finding, specifying, buying a...
by kmorin
Tue Jul 03, 2018 12:49 pm
Forum: Alloy Boat Forum
Topic: Who Does A Marine Survey Matters
Replies: 3
Views: 112

Re: Who Does A Marine Survey Matters

it is not unreasonable to ask a Surveyor for his/her list of 'check items'. For example in the fit out and plumbing category (regardless of how it is titled) is the alloy of the tank-to-hose fittings noted? OR, if the alloy is not shown/confirmed in every boat with a live aboard cabin: that list of ...
by kmorin
Tue Jul 03, 2018 11:59 am
Forum: Alloy Boat Forum
Topic: Who Does A Marine Survey Matters
Replies: 3
Views: 112

Who Does A Marine Survey Matters

I'm not operating a full time boat building business as I have in the past. I am working as a helper and part time welder for a project so I've gotten more involved in welded aluminum boats recently than in the past four or five years. I was called to help look over some problems with a boat, recent...
by kmorin
Sat Jun 30, 2018 2:05 pm
Forum: Alloy Boat Forum
Topic: Corrosion advice
Replies: 12
Views: 565

Re: Corrosion advice

capesteve, generally a single point of corrosion can be assigned to some form of stray current, poor wiring, hull used as an anode. But as Chaps has mentioned several times; if you can't find a way to inspect the interior of the bilge- you can't determine if you have a single point of corrosion/exca...
by kmorin
Sun Jun 17, 2018 5:26 pm
Forum: Alloy Boat Forum
Topic: Recent Chine Extrusion Experience
Replies: 28
Views: 2527

Re: Recent Chine Extrusion Experience

MallardRain20, IMO the chines built with the slotted extrusions should be welded inside and outside AND pressure tested to 3-5psi. Many MIG welds have root porosity (gas pockets), just as many have cold lapped starts, and either condition can lead to a sealed void made at shop temperatures (60-80F)....
by kmorin
Mon May 28, 2018 10:39 pm
Forum: Alloy Shop Talk
Topic: 24' DYI alloy remodel
Replies: 504
Views: 29158

Re: 24' DYI alloy remodel

Tfitz, now all my remarks were in the best sense of appreciation for overbuilding but there may not be many/any images of this build - not sure yet? The reason is; the design is new, the bottom has not been done in welded metal anywhere- that I could find(?) and the interwebs are a great place to ha...
by kmorin
Mon May 28, 2018 9:32 am
Forum: Alloy Shop Talk
Topic: 24' DYI alloy remodel
Replies: 504
Views: 29158

Re: 24' DYI alloy remodel

tfitz, looks like your work is holding up, that has to be a long pull down to Valdez to get the Sound of Prince William? Glad to see the trip was rewarding, Neat seats, sure are beefy, you don't look near heavy displacement enough to warrant that much structure? Behind the dodger/cabin bulkhead to k...
by kmorin
Mon May 21, 2018 12:44 am
Forum: Alloy Boat Forum
Topic: Hull Pitting / Flowering
Replies: 9
Views: 713

Re: Hull Pitting / Flowering

AK7, just a few notes from the images. #1 the zincs (don't know alloy? might be a better alloy out there?) don't show excessive wear if they're original. #2 the trim tabs don't show too much galvanic reaction to the surrounding transom mount- the edges of these would be reactive even if the flats ar...
by kmorin
Fri May 18, 2018 6:39 pm
Forum: Alloy Boat Forum
Topic: Hull Pitting / Flowering
Replies: 9
Views: 713

Re: Hull Pitting / Flowering

AK7 the buff job seems to have left different colors of sheet? From the pictures, but not looking at the boat myself so I can't be sure- I'd say the buffing was not uniformly deep enough into the mill scale and that a good amount of it remained? Zep works best in higher concentrations, warmer metal ...
by kmorin
Thu May 03, 2018 2:19 am
Forum: Alloy Boat Forum
Topic: Recent Chine Extrusion Experience
Replies: 28
Views: 2527

Re: Recent Chine Extrusion Experience

delta, alumino, I'm sure there is a good reason (good to the person making it) for not welding outside these chine/socket extrusions? I don't buy into that particular design element but then I'm NOT manufacturing boats and price point- a couple hours here and there are not critical to my work. In a ...
by kmorin
Wed May 02, 2018 12:32 pm
Forum: Alloy Boat Forum
Topic: Miller 350P setting chart?
Replies: 1
Views: 318

Re: Miller 350P setting chart?

Alumioforte, agreed such a chart may help but the work of collecting and publishing is not likely returned to someone who's got this power supply and uses it full time? .... so I'm agreed it would be useful info, but not likely to appear anytime soon? I've just recently moved into a project where we...
by kmorin
Sun Apr 29, 2018 12:11 pm
Forum: Alloy Boat Forum
Topic: Through Hull Transducer Mounting For Aluminum Alloy Boats
Replies: 4
Views: 469

Re: Through Hull Transducer Mounting For Aluminum Alloy Boats

ehsvp, the only possible risk to the hull from a penetration is that the lower profile of the transducer is taken off- by impact or grounding- and leaves the hole open or partially open to flood the hull. Countering that- is the extremely low profile of most through hulls now. They are almost always...
by kmorin
Fri Apr 20, 2018 12:36 am
Forum: Your Alloy Boat
Topic: Almar 22 sounder repower
Replies: 16
Views: 2182

Re: Almar 22 sounder repower

harcher, please go slow on a re-balance and ballast? You won't want to add ballast if it's not needed and until you feel the boats roll moment (side to side) with some real loads- I'd caution that adding ballast, now, was premature. Swapping out engines, going to an outboard leg - mounted aft and no...
by kmorin
Thu Apr 19, 2018 11:26 am
Forum: Alloy Boat Forum
Topic: New From My Shop
Replies: 2
Views: 651

Re: New From My Shop

Yofish, in keeping with your policy of brevity, a single image post just leaves me with more questions than answers. So, just in case you feel inclined to share a bit more about the design and build? I'll ask some of the questions that this image brings to my mind? Starting with the trailer- not a b...
by kmorin
Fri Mar 23, 2018 12:06 pm
Forum: Alloy Shop Talk
Topic: aluminum prices????
Replies: 6
Views: 994

Re: aluminum prices????

We just ordered a 32' in sheet goods; mainly 1/4". While we pay lots of frt to get the metal to Alaska, so 3$-4/lb is not new here, we were told the PNW tariff cost increases were about 2weeks out, so figured inventory would be hit hard (and it's spring too) and ordered. The skipper decided to buy n...
by kmorin
Fri Mar 23, 2018 12:02 pm
Forum: Alloy Boat Forum
Topic: Black Water Tank Sending Units
Replies: 13
Views: 801

Re: Black Water Tank Sending Units

Bob, It looks like the float type with the stilling wells installed over the float- to allow liquids only into the well solves the black water challenges of mixed solids in the measured column? So that looks like a simple and easy to install solution? But, on a related topic as a note about sensor s...
by kmorin
Thu Mar 22, 2018 4:29 pm
Forum: Alloy Boat Forum
Topic: Black Water Tank Sending Units
Replies: 13
Views: 801

Re: Black Water Tank Sending Units

quick link to a paper/pdf on the types of sensors, that may be useful in tracking down a vendor?
http://www.gilsoneng.com/reference/Levelpap.pdf

cheers,
Kevin Morin
Kenai, AK