Re: [thrower] Faster than a spee ding bullet…NOT QU ITE!
I'm impressed. You seem to have some SERIOUS book learning. When David
Adamovich and I were talking in Phoenix I said I FELT that I throw about 25
mph. Since I've been going to tournaments I have found speed doesn't
matter, accuracy does!
Now for a real knife throwing question. Since I throw the same knife by the
handle and the blade I was wondering if it's "normal" to change your grip
for different distances. For instance, at 8' I hold the blade much higher
in my hand than I do at 15' and 21'. My handle throws at 12' and 18' are
placed differently in my hand also. Is this normal to move your hand along
the blade when throwing or am I learning wrong? Burl, I'm trying to do what
you suggested, PRACTICE CORRECTLY.
I look forward to everyones comments.
----- Original Message -----
From: "Tim Valentine" <comlogic@...>
Sent: Monday, April 30, 2001 8:13 PM
Subject: Re: [thrower] Faster than a speeding bullet…NOT QU ITE!
> > My throw, ... has been measured by digital videography at between 23 and
> > i.e., 23 mph for the 1/2 spin, 25 mph for a single spin, 24 mph for a 1
> > and 2 spin, and 25 mph for a triple spin. It’s fair to say, therefore,
> > give or take 1 mph I am consistently throwing around 24 mph. For those
> > interested in the minutia of this debate here are the facts: a digital
> > camcorder was used to record each spin from 1/2 through triples. This
> > played back, paused and advanced one frame at a time at 30
> > That’s 1/30 of a second/frame or 33/1000 of a second/frame! The exact
> > distance in inches was measured from where the knife was released to the
> > target. This was 87 inches at the 8-foot line. In other words, 96 inches
> > (from the 8 foot toe line to the target) LESS a 9-inch over reach equals
> > inches for a 1/2-spin. Moreover, it was revealed that regardless of the
> > number of spins thrown, the knife leaves the hand virtually
> > the ground or 1/4 spin prior to a horizontal, dead-on tip to target,
> Interesting that you have also discovered the point up attitude of the
> knife as it leaves the hand. I discovered this also quite a while back
> and documented on the Sticking Point page
> > Think about this, if the knife were
> > released for a single spin when the point were facing the target its
> > tangential flight path would be straight down to the floor.
> Not exactly true. Centrifugal force would tend to direct the knife
> straight ahead while curvealinear motion would tend to direct the knife
> straight down. The resulting path would be more like a "sticky handle"
> throw which lands several feet in front of you.
> > For a knife to
> > fly horizontal to the earth it has to, therefore, be released 90° prior.
> This is one of the principles that Igor Sikorsky had to discover and
> overcome to make the helicopter a viable controlled flying machine. In
> effect the swash plate mechanism adjusts the angle of attack of the
> blades 90 degrees prior to the direction of flight desired. This is due
> to the inherent lage between the actual movement of the blade and the
> actual areodynamic effect to happen.
> > For those of you who want to do the math, the distances from 1/2 through
3 spin are: 87, 135,
> > 171, 212 and 291 inches respectively (these are the standard 8, 12, 15,
> > and 25 feet toe marks less the 9" overreach. In the case of a 2 spin I
> > inches beyond the 18 foot line.) The time of flight for 1/2 through 3
> > are 0.22, 0.30, 0.43, 0.50 and 0.67 seconds respectively. Rate equals
> > distance divided by time. Using one spin as an example, 135 inches/0.30
> > seconds equals 450 inches/second. This needs to be multiplied by a
> > ..0568, which converts inches/second to miles/hour. So, multiply
> > 450-inches/second by .0568 to get 25 miles/hour!
> These were posted some time ago as I measured at 426 inches, allowing
> for error there is still a noticeable difference.
> << The times taken at 35.5 feet =>
> 1. 0.58 8. 0.56 15. 0.59 22. 0.56 29. 0.44
> 2. 0.63 9. 0.80 16. 0.67 23. 0.68 30. 0.48
> 3. 0.64 10. 0.49 17. 0.66 24. 0.50 31. 0.43
> 4. 0.68 11. 0.55 18. 0.55 25. 0.53 32. 0.65
> 5. 0.68 12. 0.56 19. 0.46 26. 0.56 33. 0.49
> 6. 0.50 13. 0.70 20. 0.68 27. 0.41 34. 0.61
> 7. 0.46 14. 0.47 21. 0.44 28. 0.45 35. 0.66 >>
> > I hope this affirmatively
> > answers the question of whether bad ass knife throwers should carry
> > weapons when a potential perp carries a gun that actually fires its
> > projectile at whatever the hell speed a bullet goes.
> Next time you get the ear of an experienced cop ask them about the 20
> foot rule concerning blade draw usage compared to firearm draw and usage.
> tim valentine
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
- On Tue, 1 May 2001, cgeddes wrote:
> Is this normal to move your hand alongChanging both the placement and the type of grip will both influence the
> the blade when throwing or am I learning wrong? Burl, I'm trying to do what
> you suggested, PRACTICE CORRECTLY.
spin rate, and these are among the techniques that experienced knife
throwers use to gain different distances. The problem is trying too many
variations while you are still learning can get confusing. You have two
choices (and anything in between).
1. Practice one grip and placement over and over until you can always
replicate the hit from a given distance. Don't try variations until you
can reliably predict what you can do with an absolutely known and
practiced single variation.
2. Don't worry about it much and have fun experimenting with all kinds of
different techniques. After all, you're life is not going to depend on
your skill here, so just have fun with it and don't worry if you improve
more slowly at any one variation.
See you in Redding!
Lee! This time you picked Father's day weekend! Luckily my family is very
mjr@... mrapaport@... KD6KVH
...the original throwing weapons page...
matthew http://www.sonic.net/~quine/thrower.html rapaport