DynaBee makes yoyos, a descendant of the sling.  That DynaBee ammo looks supiciously like my grooved glandes design of 3 years ago. However, I use the groove to accept a sling cord (no pouch needed). DynaBee says to us a normal sling.  There is a mention of an ancient grooved glandes design.



I'll send Chris that Larry Forsyth article to post. Dan

I thought I should add this suffixial bit of info....my choice in calling my ammo 'dynabee' was as a monicker in reference to the amazing 'Dynabee' gyroscopic wrist exerciser and was unaware of the 'dynabee' you are speaking of........suppose someone in a parallel dimension is slinging antimatter propelled buzzbombs at a wormhole in our neighborhood? 

(insert Rod Serling theme here)

Johnny,

I'm regretting my previous post because I do not want to foster contention among us friends, but your post makes my point for me. 

Assuming a hair is 1/100 of an inch in diameter, are you saying you believe they were accurate within 1/100 of an inch with never a miss?  At what distance do you suppose? 

As soon as it is recognized that these accounts cannot be taken literally, we have to interject common sense and experience to try to arrive at what is reasonable.

I'm certain they were very, very good.

Quote:


Interesting, can you recover it?

Quote:



Hi TechStuf, do you means that DunaBee Ammo has a vastly reduced drag? I´d like to know how is that. Can you explain it? Though trouts are not grooved  it´s certain that they remain still in the streams, I don´t ´know how they do.

Welcome you and your ingenious devices.

Hondero

It gets quite complicated, but essentially, yes.  Gyroscopic precession and complex aerodynamics are both brought into play to increase the efficiency by which this deceptively simple shape propagates itself through the air.  I have since improved upon the shown example markedly but cannot reveal such here in this forum at the present time.  Here is a link to some interesting research into Schauberger's discoveries:

http://www.frank.germano.com/airship.htm

Yurek, these last days I have been thinking about the subject of the weight of the projectiles and these are my conclusions in relation to the three questions. I dont´t know if they are right:

1- The one oz. projectile will be more restraining by the air that the one of two oz. because in spite of its smaller frontal surface, it is decelerated more due to its smaller mass: F = m x a. The deceleration is finally inversely proportional to the radius (for a espherical projectile). Perhaps however, being the projectile of 1 oz made of lead, and of stone the one of two oz., the effects are compensated and the same range is obtained or even a little more range is reach with the one oz. projectile.

2- The effort to send the one oz. projectile would be something smaller, although for so small proyeciles its weight is almost despicable with respect to the weight of the arm, that it has also to move at the speed of launching, driven mainly by the muscles of the shoulder, that are in charge of the effort. Actually I think that the max. speed of launching of both projectiles would not be very different. But there is another effect to consider, and is the tension in the cords due to the centrifuge force of the projectile, that would be inferior for the small projectile, being left the cords most loose, providing a bad turn around and less strong clutch of the projectile in the pouch, which would be translated in loss of projectil release speed. If in addition we are using a long sling for greater range, the air drag on the cords would even relax them more. Therefore, it seems that the lightest projectile would have more disadvantages, and would be necessary to also resort to very light slings.


3-  Considering all this, the problem is to evaluate if the small increase in the speed of launching, due to the smaller weight, compensates the other two negative effects of the greater deceleration and the worse behavior of the sling. This is the tactically important point, to determine the "border" weight of the projectile for a determined sling, below which the range would be lesser than with one heavier. By intuition I place this " border weigh" in 30-40 grams for a very light modern sling. The more light and the less drag it has, the border weight would be also smaller.


I don´t know if your opinions are similar to mine and in any case it is necessary to experiment. The worse thing of all will be to find the very small glandes afther been shooted, ha ha. It will be necessary to engage some meticulous Japanese people you mention  .

Something has gone wrong in the fast calcules... My results are 4 times biger the drag force for the 2 oz projectil, and so the deceleration will be 2 times biger. But even that, is a great result  in favour of 1 oz lead glans.