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Jon and V Boat Conversions & Modifications
1992 Polar Kraft MVT-1751 with a 1992 Evinrude 60 HP…my first tin boat project
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<blockquote data-quote="Axhammer" data-source="post: 503666" data-attributes="member: 16767"><p>Like a said in the previous post. I have questions to ponder…</p><p></p><p>Why did someone weld the tunnel skin to the ribs on each side of the tunnel? They welded four spots, two on each side. There are four ribs on each side of the tunnel. Why didn’t they weld all four on each side if they thought it needed the additional strength?</p><p></p><p>I’m pretty sure they only welded what they could get to, without removing the rear seat.</p><p></p><p>These boats don’t normally crack, and when they do crack, there is usually a reason.</p><p></p><p>I know for sure, the floor on this boat was flexing up & down at the cracked ribs.</p><p></p><p>I believe this boat had a plywood floor when it was new. A plywood floor would help strengthen the hull bottom because it would tie both together, where the floor & hull is attached. I believe maybe after a couple decades the wood floor might not have been adding to the strength because it was probably starting to rot.</p><p></p><p>Add in the fact the boat had a 60 hp engine on it for the last ten years at least, vice a 40…now there is added stress from the engine.</p><p></p><p>I will post pictures of the added welds that are not factory welds.</p><p></p><p>These cracks adjacent to the non factory welds are what I couldn’t weld yesterday, because I ran out of argon.</p></blockquote><p></p>
[QUOTE="Axhammer, post: 503666, member: 16767"] Like a said in the previous post. I have questions to ponder… Why did someone weld the tunnel skin to the ribs on each side of the tunnel? They welded four spots, two on each side. There are four ribs on each side of the tunnel. Why didn’t they weld all four on each side if they thought it needed the additional strength? I’m pretty sure they only welded what they could get to, without removing the rear seat. These boats don’t normally crack, and when they do crack, there is usually a reason. I know for sure, the floor on this boat was flexing up & down at the cracked ribs. I believe this boat had a plywood floor when it was new. A plywood floor would help strengthen the hull bottom because it would tie both together, where the floor & hull is attached. I believe maybe after a couple decades the wood floor might not have been adding to the strength because it was probably starting to rot. Add in the fact the boat had a 60 hp engine on it for the last ten years at least, vice a 40…now there is added stress from the engine. I will post pictures of the added welds that are not factory welds. These cracks adjacent to the non factory welds are what I couldn’t weld yesterday, because I ran out of argon. [/QUOTE]
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Jon and V Boat Conversions & Modifications
1992 Polar Kraft MVT-1751 with a 1992 Evinrude 60 HP…my first tin boat project
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