I started to reply yesterday in greater detail, but felt my comments (related to geometry comparisons) would delve past the OP subject and choose to delete. I do not have first hand experience with Fiskars you reference, but assume would fall under my descriptions below related to more wedge shaped axe/hatchet vs shallower secondary's of a typical hawk. The Fiskars however does NOT allow removal and use of the head separately, so to me a very different category of tool all together from a slip-fit head tool that can be used independently of the handle/haft.
I also have ATC Model 1, and would say the secondary bevels (OEM) are very obtuse (as relates to my comments below). I am trying to decide what to do with this hawk ..., as it really seems to simply be an all-rounder, not very good at anything specific except maybe destroying things LOL (but of good base steel for future modifications). Please do not take this as my being negative on the model, simply does not really fit MY applications ..., (yet ... ;-)
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D
dogstar
and
E
elasmonut
both made excellent comments related to geometry above.
From my read they were both speaking about the overall wedge shape of the primary grind between the eye/poll and the transition to secondary bevel. This can vary quite a bit between various axes and hatchets. In my experience "hatchets" (compared to most hawks and many axes) typically have a more consistent wedge (the single bevel secondary) lending well to splitting as this bevel is steeper than a typical hawk (the typical hawk having a lower degree secondary bevel PLUS a steeper tertiary (3rd) bevel that widens the overall thickness of the blade just before reaching the eye). I am not even goin to mention anything related to centerline rise in the wedge as this is not typically a feature of hawks or hatchets.
Hawks by comparison have a lower degree primary grind that steepens just before the eye/poll (the tertiary bevel described above). This provides weight reduction and deeper penetration of the blade (all other things being equal).
To say, or give the impression one is 'better' than the other is along the lines of a user having a goal of having 'the best' or 'proper'; a couple terms I disdain in online communications where folks seem not to have the capacity to consider each/either may be 'best' in various applications but none best at all applications. Many might read that and retort "well then I want the best overall ..." (roll eyes ...).
An example: I find hawks with thin blades cut deeply when bucking wood that is somewhat compromised (example: dead standing that is past its prime). Many might not consider even giving the impression they would harvest such wood, but I have found many reasons for such practice. Thin blades are also excellent at limbing, and many other applications.
An additional consideration is the thickness behind the edge of the primary grind. Photos #1 & #2 below shows two hawks (FH & HBH) both 'currently' having symmetrical 15dps single bevel secondary bevels (front and back same at 15dps). By contrast, I typically sharpen my hawks (Photo #3) using a multi-segmented bevel approach (2-3 independent bevels) then blend the bevels into what I would call a thin convex or an ogive geometry (picture a Spitzer bullet or spire shape, where majority of the convexity is higher on the bevel). Photo #3 illustrates my FH with geometry referenced in this paragraph. Photo #3 NorseHawk has what I would term a heavy convex, or strong convex (Norse Hawk would/should be going against other weapons right ...? It will be made thinner in the future, as this hawk is going on a diet (major weight reduction candidate ;-).
For my comparison of these two heads (FH vs HBH) I sharpened both of these two hawks to same geometry using single bevel each side, but understand one blade is thicker than the other (more on this later). Photos #1 & #2 illustrate the geometry I used in my initial field comparison of last week of FH vs HBH and as referenced in the following paragraph.
It is obvious the HBH (with rectangular poll) is much thicker blade profile than the FH. I say "obvious" because the bevel to the secondary transition is noticeably longer (apex to transition), even though the bevel angles are the same. I notice this difference in wood splitting such that the HBH pops wood apart sooner than the FH somewhat like how a saber grind compares to a full flat grind (example: my saber grind RatMaDu vs flat grind ESEE-6 both running 15dps secondary bevels). Additionally the wider bevel acts more like a scandi when planing wood (planing, feathersticking, etc.), making it easier for user to 'ride the bevel' in use. Not saying one is better overall, just there are differences where one might accel over the other depending on specific application(s).
Making an assumption ..., that you have not optimized the secondary bevels on your current TH hawk, that you make attempt to do so then test performance characteristics making notes to yourself (I try to photo document and/or video document along with written notes as a means of keeping myself honest in my self evaluations). Example: the beginning geometry on a Cold Steel Hawk is typically extremely obtuse (I am guessing yours is, also guessing same for Riz! ATC-M1), where optimizing it can provide a very different user experience. CS Hawks are like many knives (very obtuse from the factory), simply a we did the majority of the work forging > now it is up to the user to put tool in condition to match the application expectations.
RE:
"The spike would penetrate deeply into the oak but the dang stuff just wouldnt split at its size. (To be clear when I use the spike i lay the sections of wood on their side.)"
I feel your pain. I typically also lay wood on side as my goto in a hawk is typically on an 18" haft.
It sounds like the spike is driving into to the wood like a nail, because the spike dimension (toe to heel) is very short meaning the wedging displacement in the wood is not enough for the application). This is in my mind much the same issue I experience with short bits (toe/heel dimension) like I have previously referenced related to the Trail Hawk (Posts #9 & #11 above). Honestly though, splitting Oak is NOT an application I would promote a hawk for ;-) However, if I were to choose a hawk to include some amount of that type of work (part of my reasoning for the HBH), I would look to create a wedgie geometry and have a medium-large poll for wedging the wood then striking the poll down hard using the weight of the log to force the split. I did some of this the other day with the HBH on the 30" haft, and the rounds progressed up to the tertiary bevel where they then split (this option however is precluded because of a spike). EXAMPLE: lift up the stuck/wedged axe/hawk along with the billet and then invert the whole thing so that the poll of the axe hits the splitting block (this is a natural and intuitive process once you get the hang of it, also I would imagine a good way to 'carelessly' or ignorantly break a handle/haft).
Hopefully something help that can be productive for others, and not to confusing.
Regards,
Photo #1
CS FH & HBH bits inserted into a bevel gauge illustrating how different 15dps geometry can be.
LEFT: CS FH 15dps 0.0420" Thick @ Primary/Secondary Transition
RIGHT: CS HBH 15dps 0.0880" Thick @ Primary/Secondary Transition
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Photo #2
CS FH & HBH measured thickness illustrating how different 15dps geometry can be.
Illustrating how much thinner the Secondary Bevel is on the FH.
LEFT & RIGHT illustrate the comparative difference in blade thickness @ Primary/Secondary transition
LEFT: CS HBH 15dps 0.0880" Thick @ Primary/Secondary Transition
MID: CS FH 15dps 0.0880" on Secondary
RIGHT: CS FH 0.0420" Thick Primary/Secondary Transition
View attachment 1874391
Photo #3
I have included this image only to show my FH geometry with "multi-segmented bevel ..., then blend the bevels into what I would call a thin convex or an ogive geometry".
This was before I made change to a single 15dps bevels (#1 & #2 above) for field comparison to HBH (as referenced above).
LEFT: CS NH Full Convex >30dps at apex.
RIGHT: CS FH Multi-Segmented then Blended Convex Secondary Bevels (31-32dps at apex)
Last word on right image should read NorseHawk (sorry if this confuses anyone :-/
View attachment 1874393