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Hollowing dam shape

hollowing dam shape

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#1 River Rat

River Rat
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Posted 29 October 2015 - 09:34 PM

I was looking at a section thorugh a Powell rod that was pubished in an old magazine and saw that he hollowed the rod using a cell configuration that was an arc which created a rather gentle transition to the dam.  I've been using a cell that is a uniform depth for about 2" with transitions at the ends that are made with a Dremel cutter that's about 1/4" or so in diameter and so the transition from hollow cell to dam is rather abrupt.  Theoretically I can see a structural advantage in stress transfer to the gentler transition made by the arc cell but I'm not sure it matters all that much and wondered what you folks thought.




Cliff Parmer

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#2 fishbum

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Posted 31 October 2015 - 03:12 PM

Keep your dams as short as possible and they basically disappear.


Powell rods were laminated with ceder. They were hollow cut only to the bamboo which was around 0.070" or so from what I can find out. There is a large difference between the ceder and the bamboo in the strength department. 


Any advantage? Run some numbers and find out.



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