Contact   Imprint   Advertising   Guidelines

Hook Knives...don't bet your life on them!

Forum for kitesurfers
User avatar
kitezilla
Very Frequent Poster
Posts: 1266
Joined: Mon Oct 11, 2004 4:58 pm
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby kitezilla » Thu Oct 23, 2008 4:40 pm

Purdyd,

Wow, someone has actually read my report! Thanks for catching that. I guess I made an error in transcribing my data on that one comparison. I entered a “4” when I should have entered a “3”. It actually made quite a bit of difference in judging the significant dullness of the knife. Here are the corrected calculations, showing that indeed, there is a significant difference at the .05 level. Intuitively, I did feel that there should be a difference in sharpness, when I looked at the data, and saw that , for the first time, 2 samples showed a 3 kilogram force reading. I am glad that you went with a stronger intuition, and looked more closely, than I did.

Here is the corrected comparison analysis for the 2 dates.

RESULTS OF THE t-Test: Using the following:


CONTROL group ( date: 11-21-07) Summary Statistics
sample value of the group Mean = 2.3475
sample value of the group Standard Deviation = .1936
sample size for group n = 4
COMPARISON group (date: 10-10-08) Summary Statistics
sample value of the group Mean = 3.015
sample value of the group Standard Deviation = .2453
sample size for group n = 4


Results of the t-test for 11-21-07 compared to 10-10-08

The difference between 2.347 and 3.015 (not the previously entered 4.015) with standard deviations of .1936 and .2453 based on sample sizes of 4 and 4, respectively, is significant at the .05 level. The value of the t-statistic for this test was -4 . 28.

Thanks again for reviewing my calculations, and alerting me to the fact, that, after 11 months of use, there has been a detectable change in the sharpness of my knife, and that, if I wish to carry a hook knife, which has a relative sharpness to a new knife, that, … it is time to change my hook knife.

Thanks for being my “second pair of eyes”.

By the way, I agree with you, that carrying 2 hook knives is better than carrying only one. I carry a little double bladed knife in my helmet pocket, and a large one in my spreader bar pad.

User avatar
kitezilla
Very Frequent Poster
Posts: 1266
Joined: Mon Oct 11, 2004 4:58 pm
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby kitezilla » Thu Oct 23, 2008 4:54 pm

blowhard wrote:Nice ,
That's where I 'm keeping mine also
I would say though your spreader is looking a little grim
time to get a new one
"when the rust shows ,Time to go"
Blowhard,

Thanks for the "heads up"....I remembered one of your past posts, describing the agony of having one of these bars breaking....also, "when the rust show,Time to go" kept echoing through my mind, like the last song your heard on the radio, so, I went out yesterday and bought a new shiny one. I will use the old one for demonstration and experimental purposes only.

With you and Purdyd looking after me, I just might make it into old age. You guys rock!

kiterron66
Rare Poster
Posts: 23
Joined: Tue Sep 05, 2006 1:23 am
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby kiterron66 » Fri Oct 24, 2008 12:22 am

The paragear.com rescue shroud knifes are first class.
I had mine sewed in on the harness pad above the hook. You can reach this with either hand.
The test is; will the knife cut through 4 twisted Q-lines and a kite leash like butter.
To be able to hold the knife in your full hand is the way to go. If you have a small, Dakine type knife with a hole in a small handle, you could stick your finger in . If it doesn't cut like butter or maybe at all, your finger could be pulled off (former life as a hand surgeon, it's called a ring avulsion injury)
I haven't found the answer to salt water corrosion. I sharpen them about once a month but should replace them 2 or 3 times a year
You can save yourself or someone else if you have equipment that works
Hope you never need this advice

User avatar
blowhard
Very Frequent Poster
Posts: 836
Joined: Tue Mar 07, 2006 4:33 pm
Kiting since: 0
Brand Affiliation: None
Location: Florence Oregon
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby blowhard » Fri Oct 24, 2008 4:34 pm

Your welcome !
I 'm also seeing some rust around the bolts that hold my Capt. Hook together
shiite
$35 and 6 mos.
must be the worst gear I have
somebody needs to come up with something better

User avatar
afflatus
Very Frequent Poster
Posts: 1150
Joined: Thu Aug 17, 2006 5:35 pm
Kiting since: 0
Brand Affiliation: None
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby afflatus » Fri Oct 24, 2008 5:21 pm

go stone age...

first company to offer a ceramic knife wins...

User avatar
blowhard
Very Frequent Poster
Posts: 836
Joined: Tue Mar 07, 2006 4:33 pm
Kiting since: 0
Brand Affiliation: None
Location: Florence Oregon
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby blowhard » Fri Oct 24, 2008 5:45 pm

afflatus wrote:go stone age...

first company to offer a ceramic knife wins...
I do know a flintknapper
obsidian is the sharpest thing ,splits to a molecule
(I have quite a bit)
$$$$$$$$$$$$

User avatar
afflatus
Very Frequent Poster
Posts: 1150
Joined: Thu Aug 17, 2006 5:35 pm
Kiting since: 0
Brand Affiliation: None
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby afflatus » Fri Oct 24, 2008 5:57 pm

send me a kite every few years and keep all the profits for yourself...

homey don't mind..
fo

User avatar
kitezilla
Very Frequent Poster
Posts: 1266
Joined: Mon Oct 11, 2004 4:58 pm
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby kitezilla » Fri Oct 24, 2008 8:54 pm

Hey,

Too much talk already...get out that deer antler, leather square, chunk of obsidian and knock off a couple of flakes...take an old hook knife handle, some J.B.Weld, and glue those chips at an acute angle in the slot of the handle...ba da bing ba da boom...make your own "DuhKind" hook knife.

You flake it...you make it...I'll test it. Who will be the first to step up? How about you, sir?

jjjlaudenslager
Medium Poster
Posts: 76
Joined: Fri Jun 02, 2006 5:31 pm
Kiting since: 4
Local Beach: none any more
Favorite Beaches: South Padre Island
Style: kitesurfing
Gear: Naish Ride 8m
many various boards
Brand Affiliation: None
Location: Canon City Colorado
Has thanked: 1 time
Been thanked: 4 times

Re: "Hook Knives...don't bet your life on them!"

Postby jjjlaudenslager » Sat Oct 25, 2008 9:00 pm

Kitezilla is so courteous, good humored, thorough and smart, if I was a girl I'd want him!

User avatar
blowhard
Very Frequent Poster
Posts: 836
Joined: Tue Mar 07, 2006 4:33 pm
Kiting since: 0
Brand Affiliation: None
Location: Florence Oregon
Has thanked: 0
Been thanked: 0

Re: "Hook Knives...don't bet your life on them!"

Postby blowhard » Mon Oct 27, 2008 10:53 pm

not sure if this was mentioned
but I just bought a selt belt cutter from Benchmade
300 Beavercreek Road
Oregon City Or. 97405

440 stainless which means some rust and resharpenable
they actually will resharpen for lifetime for free
but you can touch them up with a round file
I guess you could buy a couple of them they are only $20
they are about the size of the Da Kine knives
but they are a finger hole type


Return to “Kitesurfing”

Who is online

Users browsing this forum: Google [Bot], mutexx, seglarn98, tomtom and 17 guests

cron