Does a flat grind fire has better action?

[Erik131065]

I can remember someone here on the forum who stated that 13"flat grind blades had better action than the bayonet due to the lighter weight. Is that true? Sounds reasonable to me.
I"m still looking for a decent, fast firing 13 incher.

[Erik131065]

Sorry for the grammar, HAVE better action.

[Viking45]

I once thought a dagger grind might fire faster because of it's lighter weight.
When you look at how the springs are forged each one has a different thickness due to being hand made.
There are going to be differences not only in thickness but when the product is being ground and the fit and finish are tuned each spring will have it's own action.

When you look at the technical aspect a flat grind will weigh more than a bayonet grind. The bayonet tip is ground on both sides and there is a bevel grind at the tip whereas a flat grind has the most steel than any other grind.
The dagger would most likely be the lesser weight blade of any of your basic grinds.

Not an expert but if possible compare all three and you will see the flat grind blade is the most robust of the three basic grinds.
If anything(in theory) the flat would be the slowest but it really comes back to the spring action.

[ILikeStilettos]

Actually, Dave, what you need to look at is the cross sectional area of the blade. The bigger the cross section, the heavier the weight and the more mass you need to move, I. E. slower. On that basis alone daggers and flat grinds are dead equal, 1/2 x height x thickness. Bayonets are heavier. Another way to think of this is that you start with a rectangular blank. A flat grinds both sides away so that it is only full thickness at the spine. A dagger does the same thing, but is full thickness at the midpoint. A bayonet has some area that is not ground away, therefore more material. Note, if the blade is hollow ground, it's like doing a flat, then dishing out to remove more material. The deeper the hollow, the lighter the blade. See?

Note, kick springs vary as does friction. Kinetic energy is mass x velocity squared. Equal springs provide equal energy. If you have a short and a long blade of equal mass, then velocity must be the same. If one has less mass, the velocity goes up. For equal shaped and proportioned blades, the longer will have more mass and be slower.

[ILikeStilettos]

I can remember someone here on the forum who stated that 13"flat grind blades had better action than the bayonet due to the lighter weight. Is that true? Sounds reasonable to me.
I"m still looking for a decent, fast firing 13 incher.

Depends on your definition of what defines better. If you mean more quickly, then make the blade as light as possible, a hollow ground dagger or swedge which tapers to the point. The sharper the taper, the lighter the blade.

Now if better is a hard kick, that may mean a thick and heavy blade. It's the old car vs. freight train argument. The train at one KPH has lots of energy because it is so heavy. The car at 100 KPH may have a fraction of the energy because it is so light. My hardest kicking knife is a 13" swedge that is 1/4" thick, my fastest knife is an 8 cm mini.

[Erik131065]

Well, that makes sense. Thank you all

[sammy the blade]

Personally I've never handeled a 13" stiletto that opened fast, or hard. That's why I didn't buy many of them, always prefered the 9's just for that reasons. Not saying they aren't out there I just haven't seen any.