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So if you hard mount this tank with bolted straps, nest it between bulkheads, or in any way try and fix the tank with structure, you will not like what happens next. The expansion of the tank will either break the structure (likely) or buckle the tank (unlikely).
Your comments agree with most of what I said, but I'm having a problem understanding this one ...
Large tanks are mounted in this manner every day, in probably every Convertible and MY manufactured, and far larger ones than those in this YF we're discussing.
I've never seen a foamed-in fuel tank in an inboard yacht.
And the tank in that photo is 1 meter long isn't it?
5086 aluminum expands at .000132 inches/inch per degree Farenheit. Exactly. If the tank is 12 feet long, and the delta T is 100 F, the tank expands just under .200 inches, or a little less than 1/4". Not the 1/2" to 1" I mentioned in this case.
I have no idea how long the tanks are in the 42' YF and neither do you. The longer the tank, the more it expands. It was a number intended to help illustrate a concept, which it does.
The use of baffles in the tank will reduce sloshing and the surface effect, but does not change any of the principles or difficulites in mounting the tanks.
So the tank would have to be 12' long and the temp would have to go from ambient, let's say 80 degrees, to 180 degrees ambient, for the tank to grow .25"?
That's a hot day for a boat that has an outboard engine.
So the tank would have to be 12' long and the temp would have to go from ambient, let's say 80 degrees, to 180 degrees ambient, for the tank to grow .25"?
That's a hot day for a boat that has an outboard engine.
Or cold.
100 F is a reasonable delta T if you consider that it is temperature change period, hot or cold. There are CC's in the NE, no? Does it go to below freezing up there, and then to 100+ at times in the summer. I think so, and that is the design case. Aluminum changes dimensionally with temperature, in this regard it does not care if it is hot or cold it's all about the change from coldest to hottest and the length of the tank. If you don't like 100 F pick another, it doesn't change the concept that I was trying to illustrate.
The tanks in my photo were 12' long for a 35' boat holding 300 + gallons. The boat in question is a 42' holding 600 gallons. It seems reasonable that the tanks could be at least that long, maybe longer than 12'.
I'll tell you what, when you or anyone else can provide an exact length dimension for the tanks, I'll calculate the dimensional change in inches at whatever temp value you want. Obviously, as the YF tanks are foamed in, someone else has already concluded that this is the best method of attachment (along with virtully every other CC builder)-so I'm not at all sure what point you are trying to make.
In the meantime, let's not hijack this thread any further.
They are there still, not sure why you can't view.
Spoke with Richard this morning, the fuel filler hose has been tested and is rated not only for fuel and ethanol, but is also rated to hold methanol, which is very corrosive. He advised that they had gone through an entire battery of tests once they changed all of their tanks to aluminum, and that they were rated properly for the manner in which they install them.
He also stated he does not believe that the fuel tanks are standard aluminum, and that he would check into their composition or the composition of the coating and get back with me.
The hull is Awlgrip, and I may indeed get some clear coat over it once it cools down enough to keep me from spending every waking moment on it.
And so far as having engine data sent to my Garmin or Furuno displays, I am not sure that I would want that vs. having a separate display for the engines all the time. I went with multiple monitors so I could have my nav up on the left, and my bottom or radar display on a separate unit in front of me. Any benefit from having these already busy units tied up with other information isn't immediately evident to me. Again, I have been out of the outboard world for years, and if I need to be educated here feel free to do so.
I'll keep info flowing as I get it.
Last edited by Detour; 09-28-2009 at 04:30 PM.
Reason: really bad english in one sentence.
They are there still, not sure why you can't view.
Spoke with Richard this morning, the fuel filler hose has been tested and is rated not only for fuel and ethanol, but is also rated to hold methanol, which is very corrosive. He advised that they had gone through an entire battery of tests once they changed all of their tanks to aluminum, and that they were rated properly for the manner in which they install them.
He also stated does not believe that the fuel tanks are not standard aluminum, and that he would check into their composition or the composition of the coating and get back with me.
The hull is Awlgrip, and I may indeed get some clear coat over it once it cools down enough to keep me from spending every waking moment on it.
And so far as having engine data sent to my Garmin or Furuno displays, I am not sure that I would want that vs. having a separate display for the engines all the time. I went with multiple monitors so I could have my nav up on the left, and my bottom or radar display on a separate unit in front of me. Any benefit from having these already busy units tied up with other information isn't immediately evident to me. Again, I have been out of the outboard world for years, and if I need to be educated here feel free to do so.
I'll keep info flowing as I get it.
Nice update, especially with their choice of paint.
I may have missed it somewhere in this thread - but are the hoses and wires in the pics with sufficient chafe protection? Regarding fuel tank material; there is no such thing as "standard" aluminum except for when it comes from the refinery as Al. Each application in industry can be different with tight alloy specs to cover each one. Different painting specs are used dependent upon the alloy. The tanks should never stay damp due to the covering foam material. An Al tank requires free breathing all around and proper mounting to prevent corosion and fuel leakage. Proper Al tank installation and potential resultant woes are well established. YF should be quite aware of these well known methods. Of course AL tanks are not as sexy as paint, graphics and rod holders.
Last edited by sunchaser v; 09-28-2009 at 02:02 PM.
you can add the gateway later - I think it would be nice to have engine and smart craft alarms..on the big screen ...and the redundancy factor. Perhaps a few of the N2000 yam and etec guys can chime in here and explain if they think it is worth it....
When I got married, we left the reception at the Pensacola Yacht Club on a Bertram sportfisherman named "Anticipation". Very appropriate then, and I always think of that name when I see these threads. Good luck and enjoy. That's a sick boat!
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"Destination"
2005 Contender 27 Yamaha F225's
Actually, You DON'T disagree with me. You THINK you disagree with me, but you're mistaken. You're simply experiencing an illusion caused by the limits of your comprehension. -Dilbert
I don't understand all the fuss about the tanks. Of all the tanks I have replaced (probably 60-75) 90% were found to be corroded from the inside out, the other 10% were found to have foreign material under them which promoted the corrosion. This material included screws, wrenches, coins, you name it. You can put whatever you want on the outside, it won't protect the inside and if the installer dropped his pocketknife before he set the tank, you're still screwed.
Congratulations on your purchase, thank you for supporting our industry and enjoy your new boat.
Man I know just what your talking about. Gonna be an awesome looking boat. Congratulations, your gonna love it. I run mine every chance I get. It's a fishing machine. PM me if you have any questions about the the boat. Good luck !
River1, Nice pic of Crab Island whatcha fishing for there?. HAHA. I have seen your boat, Don't you keep it at Brooks Bridge Dry Storage? I will tell you, These boats are Freaking awesome. A good friend of mine used to run the one in our area called MerriKohl. Fished it several times. BADASS is all I can say. Detour you will love it.
i cant see pics...? just a blank page... 
