From: email@example.com (Gerald L. Hurst)
Subject: Re: Det Cord R.O.B.
Date: 22 Jun 1996 19:44:48 GMT
In article <firstname.lastname@example.org>, Thomas K
>Just curious, what is the rate of burn for Det Cord, we used to cut small
>trees down in LeJeune with it...-Tom
They must have been pretty small trees or you used a lot of det cord:)
The det velocity is around 21,000 ft/sec for the 50 grain PETN variety
and probably around the same for the military and oil well cord using
A few wraps of det cord around a 1-ft diameter tree will blow a ring
of bark off. Trees are tough targets for explosives unless placed
in a hole bored in the trunk. When one does have to blow down a tree
from the outside, it is best to use two opposing and slightly offset
charges to produce a shearing action. Some very large trees require
up to 40 pounds of HE.
We used to fell trees with lightly gelled Astrolite G poured or
injected from a squeeze bottle into the slit produced by forcing the
tip of a chainsaw into the trunk. A pound or less will take out a 2-ft
diameter tree. This was a method developed for helicopter LZ clearance
during the Viet Nam war.