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Thread: Beefing up Grummans?

  1. #1
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    Default Beefing up Grummans?

    Hi, I'm new to the site and really enjoy all I've read so far. I live in Kansas and have 19' grumman. It has a little top rail damage from getting swept downstream in a flood one time. Anyway I'm wanting to put a motor on it, probably something in the 8hp range. one of the forums mentioned that the grummans twist and over time will develop cracks. Should I beef mine up? Anyone done that and have pictures of what they've done? Thanks.

  2. #2

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    Quote Originally Posted by rush_60 View Post
    Hi, I'm new to the site and really enjoy all I've read so far. I live in Kansas and have 19' grumman. It has a little top rail damage from getting swept downstream in a flood one time. Anyway I'm wanting to put a motor on it, probably something in the 8hp range. one of the forums mentioned that the grummans twist and over time will develop cracks. Should I beef mine up? Anyone done that and have pictures of what they've done? Thanks.
    I wouldn't expect there to be any problems. We have been running 15hp props on our 19' freighters with no problem for well over 30 years. The only cracking we have had was from jumping the loaded boat off a boulder here or there and from stress along the ribs where the previous owner had the great idea of installing new D-rings riveted to the top center of each rib (read: weakened the rib at the highest stress point). I will say that these are the older models with the thicker aluminum. It may not be the same with the ones made more recently with the thinner material. I think they have since gone back to the thicker material, but not 100% sure on that or exactly what the timeframe was that the others were made.

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    the canoes can show stress cracks on the center seat where it has a suport coming up from the floor you can look at the center rivert an see if it is there, saying that this only happends over time, it won't happend unless you beat the heck out of it, going full speed an make the canoe jump back an forth across the stream an have it """ over loaded ""' this will cause the twist in the canoe, an over time it will show up. if you run large water an don't do fast hard turns with a heavy load it is like anchskier say's you will never see it in 30 years even doing the beat it up it will take 7 to 10 years to show any stress cracks with heavy use
    MY 2cts on the 19 ft Grumman squar end SID

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    I did put Alum. channel on the bottom so you could run rockey rivers it is not easy to put it on but it will go, I can't figure out how to post it on the form I did it a few years back if you drop me a pm an give me a address I send you some shots of it , but unless you are a crazy moose hunter you don't need to do it .

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    Alright well that's good to hear. It's been a while since I looked but I think mine was built in 61'. I've only owned it for a year or so. Paid $400 for it so I think I got a pretty good deal. Almost got a second one for the same price but someone beat me to it. We don't have as much rock in our rivers around here. They're mostly mud and sand. I'm planning on using it to fish and trap. No hunting.

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    put a lift on it an go, if you don't want a lift, bolt a false transom on an raise it up about 5 to 8 inches so that when you put the the motor on, the caveration plate is about 1/2 inch below the bottom of the canoe, make sure you get a tiller extension, so you can stear it an not kill your self , I like the non flex one, an some people like the flex ones, if you don't raise it up the motor will stick dowh about a foot below the botton Cabelars sells the tiller extensions, i think

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    So Grumman now list the thickness of the skin on their 19 and sportboats as .050....this is up from .040.... Is this the thickness of the original Grummans?

  8. #8

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    Quote Originally Posted by pipercub View Post
    So Grumman now list the thickness of the skin on their 19 and sportboats as .050....this is up from .040.... Is this the thickness of the original Grummans?
    As far as I know, that is correct. They went back to the old standard after a lot of complaints.

  9. #9
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    Well, that is good news....I may have to start saving up for a new sportboat....

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