Traditional knife homework - Blade length to handle length ratio.

J

Just Tom.

Joined
Apr 24, 2019
Messages
2,575
Assignment:
For folding knives only - compute the ratio between the length of the blade (not including tang - sharpened portion only) and the length of handle.

Rules:
-Measure the sharpened edge on a straight line (not along the belly).
-Show the result as a decimal number (not a fraction). This way you can use whatever units you are comfortable with.
-Show your work.

If you want to show your knife with the greatest or least blade/handle ratio, a knife with what you think has the ideal ratio, your favorite knife, or just some other random interesting knife is up to you.

I picked these two out by eyeball, but I’m pretty sure they are my maximum and minimum:

0.82:
u9i63K0.jpg


0.59
EtZjwSI.jpg


I am no math wizard, so if I boogered something up here, let me know…
 
It's my bedtime, but I'll try one just to make sure I understand the procedure. This is for a Victorinox Swiss Army 1 (formerly Solo?).
blade/handle = 6.3cm/9.3cm = .68. I'm surprised the cutting edge is only about 2/3 of the handle length!

Tomorrow I'll try some measurements for some of my favorite patterns.

solo.mark.open.jpg

- GT
 
5K Qs said:
It's my bedtime, but I'll try one just to make sure I understand the procedure. This is for a Victorinox Swiss Army 1 (formerly Solo?).
blade/handle = 6.3cm/9.3cm = .68. I'm surprised the cutting edge is only about 2/3 of the handle length!

Tomorrow I'll try some measurements for some of my favorite patterns.

View attachment 2045289

- GT
Click to expand...
:thumbsup: Exactly what I was looking for!
And using metric is of course the easiest and most sensible way to go about it. I just used inches because that’s all I had handy, besides 100ths of a foot engineer’s scale, which would have been easy too but less precise.
 
5K Qs said:
It's my bedtime, but I'll try one just to make sure I understand the procedure. This is for a Victorinox Swiss Army 1 (formerly Solo?).
blade/handle = 6.3cm/9.3cm = .68. I'm surprised the cutting edge is only about 2/3 of the handle length!

Tomorrow I'll try some measurements for some of my favorite patterns.

View attachment 2045289

- GT
Click to expand...

I was expecting some calculus!
 
Just Tom. said:
Assignment:
For folding knives only - compute the ratio between the length of the blade (not including tang - sharpened portion only) and the length of handle.

Rules:
-Measure the sharpened edge on a straight line (not along the belly).
-Show the result as a decimal number (not a fraction). This way you can use whatever units you are comfortable with.
-Show your work.

If you want to show your knife with the greatest or least blade/handle ratio, a knife with what you think has the ideal ratio, your favorite knife, or just some other random interesting knife is up to you.

I picked these two out by eyeball, but I’m pretty sure they are my maximum and minimum:

0.82:
u9i63K0.jpg


0.59
EtZjwSI.jpg


I am no math wizard, so if I boogered something up here, let me know…
Click to expand...
Too difficult an assignment. But the Opinel No. 8 has got it right. It's perfect!
 
Prester John said:
Too difficult an assignment. But the Opinel No. 8 has got it right. It's perfect!
Click to expand...
I just used an Opinel #7 to cut up a clementine, an apple, 6 green seedless grapes, and a banana to have with my breakfast cereal. Since I had the knife right there, I thought I'd measure blade and handle.
Sat down at the kitchen table, opened BF, and found Vince's post! Coincidence, ... or Grand Design??? 😲 🤓
Opinel #7 has 7.8 cm cutting edge and 10.1 cm handle, for an edge-to-handle ratio of .78.
Now I'm curious about the ratio for the perfect Opinel #8.
ETA photo:
opinel#7.jpg

- GT
 
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