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TA的每日心情 | 擦汗
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发表于 2007-3-2 20:22
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Ratings Scale:
1=Poor 2=Fair 3=Average 4=Good 5=Excellent
KaBar Nighthawk SOG 2000 MPK ATAK2 DSU2
Cutting rope 1 3 3 3 4 5
Cutting cable 3 1 3 4 5 5
Cutting webbing 5 3 5 4 5 5
Cutting PVC hose 4 1 4 4 5 5
Digging in pine 2 4 2 5 5 5
Chopping 2x4's 1 1 2 4 5 5
Lateral blade strength 3 1 4 5 5 5
-with 140 lbs pass pass pass pass pass pass
-with 225 lbs fail fail fail pass pass pass
Solvent immersion 2 1 5 4 5 5
Handle flame test 2 1 5 4 5 5
Cutting Rope:
On partially serrated blades, cuts were initially performed using only
the plain portion of the blade. Any partial serrations were employed
only if the primary edge failed. Of the various types of rope, the
manila and some braided poly rope with a hardened outer layer were the
toughest for all the plain edged knives. The presence of serrations on
the SOG, MPK, ATAK2 vastly improved their performance on these ropes.
The fully serrated DSU2 was able to effortlessly cut all the types of
rope, vastly outperforming all the other knives. The Buck lost its
aggressive edge after 4 sets of rope cuts (total of only 20 cuts).
Cutting Cable:
The Buck was the only knife that failed to cut the cable, bouncing off
the shielding with only minor penetration. The SOG's poor ergonomics
made chopping relatively difficult. The MPK was a little light for
chopping, but still penetrated the cable adequately.
Cutting Webbing:
All the knives performed without incident. The edge retention was
evident on the nylon webbing cuts, as the duller knives left frayed
edges on the cuts. When we got to the DSU2, the canvas web belt was
reduced to a length of double thickness near the buckle. We were able
to cut cleanly through BOTH layers of the belt as easily as cutting ONE
layer with the other knives.
Cutting PVC hose:
The Buck was the only knife that failed to cut through the hose.
Digging through pine board:
In the reverse grip, the cross guard of the KaBar dug painfully into the
user's hand, making this task rather fatiguing. The KaBar sustained
minor tip damage. The Buck actually performed well in this task, its
thick blade penetrating the pine rather easily. The SOG was quite a
nightmare in this test, as the guards did little to prevent the user's
hand from sliding down onto the blade during heavy digging. Minor tip
damage was also seen on the SOG. The MPK blade visibly flexed during
the prying and digging, but returned to true each time. The knife
sustained very minor tip damage. Neither Mad Dog model sustained any
damage during this test.
Chopping of 2x4's:
The KaBar was an extremely poor chopper. The smooth oval handle allowed
the blade to rotate in the user's hand, presenting the side of the
blade as we chopped. The handle also tended to slip out of the hand,
leaving the user grasping the knife only by the pommel cap. The Buck
was beyond miserable, as it had lost any semblance of an edge with which
to cut the wood. The SOG blade was reasonably aggressive on the wood,
but lost its hair popping edge as the cutting progressed. The square
handle profile and sharp checkering wore painfully into the user's thumb
after only limited chopping. The MPK's ergonomics made it more
comfortable than the first 3 knives, even though it was too light to do
serious damage with each stroke. It also experienced a detectable loss
of edge as the chopping progressed. The ATAK2 was the most aggressive
chopper of the lot, removing wood easily even from the areas burnished
by previous blade impacts. We considered this a good indicator of blade
edge efficiency, as most of the other blades were not able to chip wood
as quickly from the burnished regions. The DSU2 also turned in a good
performance in the chopping, with the teeth undamaged by the repeated
impacts.
Lateral strength (chinups):
Each blade was tested by a 140 lb and a 225 lb individual. All blades
were able to support 140 lbs. The KaBar and MPK blades flexed
noticeably with the 140 lb load. After only one chin up with 225 lbs,
the KaBar bent about 30 degrees at the tang/blade shoulder junction.
That's what happens when you don't harden the tang. The Buck blade
snapped about 2 inches back from the tip with 225 lbs on it. The SOG
blade bent at about 5-10 degrees 2.5" inches back from the tip with 225
lbs. It would still have been serviceable in this condition. The MPK
flexed rather severely with the 225 lbs load, but returned immediately
to true. The Mad Dog blades flexed moderately under the 225 lb load and
returned to true without any damage. The DSU2 suffered a mishap in
which the knife slipped out of the apparatus during the 225 lb tester's
final chinup. This resulted in the knife sliding out and momentarily
supporting 225 lbs on the last 1/4" of its tip. The tip bent about 5
degrees, but was readily able to be straightened out in a vise. We do
not consider this a failure, as the knife was not permanently damaged
from this rather extreme abuse.
Solvent immersion:
All the handle materials and blade finishes survived the prolonged
immersion in solvents. The KaBar's leather ring handle was the most
absorbent of the knives tested. The Kevlar fibers used to reinforce the
MPK's Hytrel handle absorbed some solvent, leaving the knife with a
strong lingering odor of gasoline. The Zytel and glass epoxy composite
handles did not absorb any solvent and were totally undamaged.
Flame test:
Each knife was subjected to a flame test immediately following each
immersion in solvent. Each knife was ignited and allowed to burn until
it extinguished on its own. The KaBar's absorption of solvent caused
increased flammability, especially with the gasoline. The knife burned
for several minutes until the gasoline was expended, leaving the leather
handle split and charred. The Buck's Alcryn inserts proved to be
EXTREMELY flammable, burning fiercely long after the solvent had been
exhausted. The Alcryn burned so completely that the handle inserts were
almost completely destroyed, leaving very little of the handle intact.
The SOG's Zytel handle was very flame resistant, barely igniting when
covered in gasoline. No damage was sustained. The MPK's Kevlar
reinforced Hytrel absorbed the solvents to a limited degree and burned
briefly, causing limited damage to the area of the handle near the
drilled lanyard hole (this area has exposed Kevlar fibers, which are
flammable). With their glass/epoxy composite handles, both the ATAK2
and DSU2 were completely unaffected by the flame tests. |
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发表于 2007-3-2 20:21
发表于 2007-3-3 10:46
