Taz :
... others go until the knife cannot shave, which is subjective, or cannot cut newsprint cleanly, etc. that way when they compare it, people can relate to it rather than it took 52 +/- 7 ft-lbs to cut the rope. Who measures how much weight it takes???
Not a lot. However you can simply compare it as Ray noted. If one knife requires 100 lbs and another 50, it doesn't take much to realize that means one has twice the efficiency as the other. In regards to feel, blunting is strongly nonlinear, and thus any subjective measurement is extremely difficult to use in a repeatable manner except in a very general sense (a little, a lot, a huge amount). Even trying to use a scale to read the force isn't trivial because of the influence that the way in which the rope is cut effects the force. By the way ft.lbs is a torque, not a force.
... if he set a set weight, say 50 ft lbs as the cutoff for the rope cutting, it might help compare for the ave person.
You can't compare edge retention in this manner as you are ignoring the effect of the geometry. You can factor out this effect if you consider the change in force. So for example cut until an additional 20 lbs of force is needed. And yes, this I do, as well as looking at the sharpness in other manners like cutting light thread, poly, as well as shaving and paper cutting as secondary determinations. Loss of paper slicing ability is I think a sensible general stopping point as the knife can't be used for any fine task at this point and you are mashing the rope as much as you are cutting it.
Along this general line, and the other argument ("that was a stupid test I could have told you that would happen"), not everyone has the same level of understanding that you do. Obviously a lot of work done is going to be elementary to people with the necessary experience and understanding, they would then skip all that parts as known knowledge. A lot of the test I do are obvious to me, I do them on suggestion because they are not to others. In regards to apples vs apples, again, the understanding of the design principles isn't univeral, a lot can be learned by comparing blades of vastly different designs. To some the designs may not even appear to be significantly different. Use a parang and a machete on wood and what happens. It is obvious to someone with experience and knowledge, but not to someone else and for them it is a valuable learning tool, either directly or from someone else. So again, skip the parts you find obvious.
In regards to variables, yes it would be ideal if I could have test knives made up to my specifics, but I can't so I work with what I can. On occasion, as Ray noted again, I do work with knives of very tight controls. I have another batch coming later this year, or early the next. And yes, in the strictest sense nothing can be ignored. For example the temperature on the day I do the cutting will effect the results somewhat, as would for example the height I am about the center of the earth. When making these statements ("XXX has no effect") they are generally taken to mean - within a level of significance (for knives this would be say 10% as it is very hard to notice anything smaller than this so its functional advantage isn't significant). Specifically in regards to the friction, I have looked at this various times with polishes as well as lubricants. It is small, and I have only seen real significane if the coating is very rough, and the material being cut very binding (use the double powder coat that Busse uses on thick cardboard for example). And even then it is easily swamped out by the other elements (mainly geometry) so I would consider it dead last and ignore it. My brother however mirror polishes everything to improve the cutting performance.
In regards to the angle on the Recondo, yes I asked Ron about that. It was brought up several times later in the thread. It was never answered, if it was, I would have brought it down to the expected angle so I could see the expected performance. I didn't thin it down for personal use because there were too many other problems with the knife and I would have to do too much work to make it usable to where I would pick it over something I already had.
"hey, i abused you knife and it broke, can i have another to see if it was a fluke?"
I have only asked for a replacement once that I can recall. This was with the second TUSK. I asked for a replacement there because I specifically asked McClung could it do what I intended to do (pry chips out of wood), before I did it. When I finish a review and the maker/manufacturer is online I drop them an email with the link. If the break is surprising I ask them if it was the expected behavior. Most of the time (lately) I get asked to do a review and yes this includes breaking the knife eventually, so we just discuss the results, breaks included. Many still offer replacements as thanks even though they were test knives, which I refuse, they send out anyway, and I give them to friends.
In regards to the comment about me doing this to get free knives, what I do is the worst way to get knives, consider the maker responce to this thread and others as an obvious example.
-Cliff