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One site I found says 58 pounds per cubic foot for green walnut. So if your piece is a true cylinder 36" in diameter and 8 feet long, that's 56 cubic feet of walnut. Times 58#/cubic ft. = 3280#. But unless you're pretty magical you also need to figure all the attached pieces. Ya - you're probably going to need a crane or a new roof.
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Ok, spit ball estimate based what I know of log weights. Figure 36" circumference which means 36/3.14= 11" diameter log. At 8' an 11" log is 24 bd ft by Doyle scale. Walnut logs weigh 11,900 pounds per 1000 bd ft in the rough so setting up a proportion I get 285 pounds for an 11" by 8' log.
References:
Doyle scale calculator:
http://www.woodweb.com/cgi-bin/calculators/calc.plWeight of green logs:
http://www.globalwood.org/tech/tech_wood_weights.htm
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Without seeing the tree and the house in proportion to it, simple answer Yes, Id plan on it.
Call a few arborists and get their input. They might be able to climb, tie it off to the main stem, and lower it. No way I would fool with it myself.
Inquiring minds.....WHY would you want an 8' length of branch that is only 11" in diameter.....first off its a branch, second, after dealing with sap, there isn't a lot of usable meat.
Once Favre hangs it up though, it years of cellar dwelling for the Pack. (Geoff 12-18-07)
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No crane required. I have an arborist friend who takes down much larger limbs than that when they are hanging over houses. It's amazing to watch how he manages to swing the pieces away from the roof with nothing more than a rope - and the knowledge of how to use it.
John