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Thread: Anyone know when Grumman switched to thinner Aluminum?

  1. #1
    Member RainGull's Avatar
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    Default Anyone know when Grumman switched to thinner Aluminum?

    Anyone know when Grumman switched to thinner Aluminum?
    Science has a rich history of proving itself wrong.

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    Default thinner alum. on Grumman

    Grumman Corporation sold their canoe manufacturing operation to the Marathon Boat Group. I understand that the new owners proceeded to "improve" the 19' freighter by reducing the former .050" aluminum hull to .040". Only in the last several years has Marathon Boat Group been licensed to call them Grummans. Older canoes with a model/serial number plate that says made by Grumman Corp. should be originals and have the thicker hull.

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    Member GreginAlaska's Avatar
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    Default

    I don't know when it happened...but that's the kind of thing that happens when you let your children become engineers.

    Ya, I got nothing useful to ad to this thread.
    “When injustice becomes law, resistance becomes duty.” attributed to Thomas Jefferson

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    I'm not an engineer, but I play one on the internet...

    So if a little is good... a littler is better. I think they ought to switch over to foil. It is so much more flexible ( think how easy it would be to pound out dents) and cheap and easy to replace. Maybe a tin/aluminum foil skin on frame with a patented spray application of 3M 5500 between layers for adhesion and rigidity....
    Science has a rich history of proving itself wrong.

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    Default canoe

    when marafon boat bought them out......i have a older frighter 19'

    1990
    Alaska

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    Default Canoe

    In the summer of 1944, after portaging a heavy wood and canvas canoe on a fishing trip in the Adirondack Mountains, William Hoffman, Vice President of Grumman Aircraft Engineering, had an idea: What about making a canoe from the same lightweight, stretch-formed aluminum that Grumman had used to become the single largest producer of carrier-based fighter planes during World War II?

    In 1945, the very first aluminum canoe, a 13-footer, was produced at the aircraft plant in Bethpage, Long Island. By the end of World War II Grumman was producing a line of 13', 15', 17', 18', 19', and 20' canoes.

    The plant relocated to Marathon, N.Y. in 1952.and in 1988, Grumman produced the largest aluminum boat in its history at Marathon. Designed for the Great Lakes, it measured 22' 3".

    In 1990 the Grumman boat and canoe division was sold to O.M.C. of Illinois, who soon purchased the DuraNautic Boat Company's tooling and assets and moved them to the Marathon Plant.

    In 1996, a group of former Grumman managers and investors formed the Marathon Boat Group to purchase the canoe and boat operation from O.M.C., and resumed production of Marathon canoes, identical in every respect to the legendary Grummans.

    In the summer of 2000, a licensing agreement was reached between Northrop Grumman and Marathon Boat Group. The name Grumman is once again back on the canoes where it always belonged.
    Alaska

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    Member RainGull's Avatar
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    Default

    So did the Grumman name stop being used after '90 or '96 (until 2000)? It would have had to be '96 since mine is a '92 with all badges. I assume the thinner aluminum started in 2000 then based upon the quote "identical in every respect to the legendary Grummans" referring to '96.
    Science has a rich history of proving itself wrong.

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    Default Grumman

    Perhaps the definitive answer would come from one of the former Grumman dealers, who no longer handle them. In Fairbanks, Beaver Sports quit selling them when the durability was compromised... the hull thinned, etc. Prior to that, Grummans had enjoyed a well-deserved reputation in Alaska for performance and durability. And the 19' freighter was and is, in original configuration, the gold standard. Marathon Boat Group should be able to tell you via the serial number the year when a particular boat was manufactured. The earlier the better. Mine was made in 1972.

    My theory is that a quality old Grumman freighter canoe, with a lift, mated to a new motor, is the way to travel the water less traveled.

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    Member RainGull's Avatar
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    The earlier the better.
    Why? Sheet thickness should be .05 on all pre-2006 at least. Configuration is the same. What makes older better?
    Science has a rich history of proving itself wrong.

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    Default grumman

    As I understand it, the switch from .050 to .040 took place when Grumman originally sold the manufacturing rights and not just in 2006. In 2000, when I started looking for a freighter, Marathon's specs listed .040. The current specs listed on the Marathon web site are @
    http://www.marathonboat.com/square-19.asp

    I would want a freighter made in its original permutation... by Grumman. Those are the boats that achieved a stellar reputation in Alaska. With reasonable caution, they don't wear out. And still command real money, in good shape.

    Again, check with Beaver Sports in Fairbanks, and ask Ev, their long time canoe specialist, why they stopped selling Grummans.

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    Member alaska bush man's Avatar
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    Thumbs down .04

    The newer Frighter 19' is .04

    the 17ft is the only .05" hull. Why only the 17ft and not the popular 19'? Who knows!
    Alaska

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    I would think that the last year of the .05" hull thickness in top shape would then be the most desirable, say a '95? The name change and new hull thickness came in '96 correct?
    Science has a rich history of proving itself wrong.

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    Member alaska bush man's Avatar
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    Thumbs up 96 correct

    1996 is the year..........any year after that......my 19' is a much older one well used but taken care of. I use mine every moose season and early trout fishing at Quartz Lake.

    I have a lift and a 9.9 merc with lift/ RockHopper guard.....works very well.

    Went up Wood River with it last year and speed boats kept me close to the bank.....but it was fun!
    Alaska

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    Default New 19' use .50 gauge

    Square Stern
    G-1640CS 15’7” 36 1/4” 3 13 1/4” Standard 650/555 5 63/.040
    G-1750CS 17’ 36 5/8” 8 13 1/8” Standard 825/730 5 85/.050
    G-1950CS 19’ 40 1/8” 12 14” Bulb T 1100/1005 5 119/.050

    See:

    http://www.marathonboat.com/gcanoe.pdf
    http://www.marathonboat.com/grummancanoes.asp

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    Default ?

    Interesting, the links you posted have contradicting information.

    I followed the 19' Square stern on the charts and one says .04 and the other .05

    So which is correct?

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    Default older grumman

    I bought an older one also, made in 1972 its a 15 footer came with a 9 hpw engine and trailer for 1500 all are in good condition i used it also for moose and fishing at quartz lake.

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    Default

    Quote Originally Posted by gunned View Post
    Interesting, the links you posted have contradicting information.

    I followed the 19' Square stern on the charts and one says .04 and the other .05

    So which is correct?
    Called Marathon Boat, They are currently working on the first run of .05 19' Square Sterns and should have the first run ready in two weeks.

    Question:

    If you are looking to buy an new Freighter Canoe do you go with a:
    - A new 19' Grumman out of the .05?
    or
    - A Osagian 17' Missourian?

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    Default Metal Thickness By Marathon

    We built them in the .050 material starting in the 1950's until the early 1990's. Then they were built from .040 until this month. The next run we build will be the .050 again.

    Marathon Boat Group, Inc.
    PO Box 549
    Marathon, NY 13803
    888-694-1285

    GOT THIS FROM THE CANOE MFG. THIS WEEK
    SID

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    Default good news

    thanks for the info sid
    now I don't have to wait so long to find an older one in good condition

    any idea when these might be out on the market and how would one tell if it were the thicker material for sure?

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    Default Metalm Thickness

    let your finger's to the walking form an old quote, an ask them ,they are a little slow but will get back to you it took me 3 E mails to get what I did get, good luck it don't cost you a thing but a little of yor time about 2 min. [of your time] good luck Sid.

    http://www.marathonboat.com/contact.asp

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