Ive been wanting to try a Trailhand for some time now and was able to snag one from the recent Fiddleback Outpost batch - 3/32 CPM154 TT with Carbon Fiber over blue liners. Ive had it about a week now and it have been comparing it to the other OK/T knives of the same relative size. Ive also thrown in a Patch and a Hiking buddy for size reference.
Gratuitous pic of the Trailhand with a firearm:
In comparison with other OK/T models. L to R Warthog, Trailhand, Mamushi, Raptor:
and with the Fiddlebacks. L to R Patch, Warthog, Trailhand, Mamushi, Raptor, Hiking Buddy:
Model, Thickness, Tang config, Steel type, and Weight (oz/g) of the knives:
Patch 3/32 SFT O1 3.4 oz/97g
Warthog 1/8 TT CPM154 3.9 oz/110g
Trailhand 3/32 TT CPM154 3.8 oz/109g
Mamushi 1/8 TT CPM154 4.5 oz/128g
Raptor 3/32 TT CPM154 3.4 oz/96g
Hiking Buddy 1/8 TT O1 3.6oz/101g
About 2 years ago Phil (Comprehensivist) spent quite a bit of time coaxing me into giving a Patch a serious try. I finally agreed to carry one when my wife and I went to Yellowstone for two weeks. I've been carry that knife ever since, so that's the EDC I've been comparing various blades to recently. Ive been trying to identify just exactly what it is that I find useful about the Patch. The functions I use the Patch for are not what I use and require of a field knife or a kitchen knife. Although, a lot of those tasks do overlap. It does perform quite well with notching, ringing, flat cuts etc. and so its still a handy knife for detail-oriented bushcraft. It also gets used for small food prep and as an eating tool. Of course, its extremely useful in day to day tasks that most of us probably use our EDC for like opening mail, opening boxes, slicing cheese, or eating a steak.
To get more granular, whats the exact quality a shorter blade height Patch-ish knife has that I find so useful? Perhaps its that Ive been carry this one long enough Ive be comfortable with it and I want others to be more similar. As most know, Chris K-line (Kitchen) variants provide a little different ergonomics which allow additional clearance of the hand between the handle and cutting board. That assumes that the majority of the blade length is used and is parallel to the cutting surface. That is far from the case of the Patchs design, which is more or less straight and reduces this clearance to almost none if trying to use the rear part of the blade.
For an EDC, Ive noticed the way I use it means the majority of the work is done in with the first inch or two of the blade. With most tasks, there is no cutting board for clearance, but the angle of attack, i.e. the relationship of the handle to the part of the portion of the blade that is doing the work, does have an impact on what using the knife feels like. Chris mentioned in the Questions for the maker thread Chris has indicated he has a formula he starts with when designing knives and Id like to know more about what components, if any, the formula pertains to.
The relationship of handle to the part of the portion of the blade that is doing the work made me think of chord and camber on an airfoil. I found a diagram that shows this relationship on a wing:
I admit Im WAY overthinking this (or have been hanging out with Phil too much

), but for an EDC the part of the blade doing work and the angle it creates to the user, may be a far more important quality than how much cutting surface at the rear of the blade you can use without banging your knuckles or hitting the guard

- i.e. the K variant design seems to add how much blade you can have parallel to the surface at one time, rather than how much belly you can use at a comfortable angle. Thus, for EDC functions you can have a relative straight knife overall and still have a lot of usable blade at a comfortable angle. Probably the reason the puukko design has been around for so long.
So I picked a single function slicing a steak. Ive made a comparison of all the OK/T knives plus my original Patch with the thought of slicing a steak in mind and the resulting handle angle. I took the knives above and put the tip on an plane denoted by the X axis of the grid and rocked the knife back until a point 1 back from the tip (blue dot) touched the cutting surface. You could do this at any point of the blade, but I did this 1 back because most of the knives here share similarity to that point and then thats where the cutting surface geometry starts to diverge (more on that later).
Patch
Warthog
Trailhand
Mamushi
Raptor
Hiking Buddy