890 fps possible with a simple slingshot!?


PDA






torsten
September 24, 2010, 05:20 AM
Hello,

Did some tests with very fast bands and 7,5 mm steelballs again: first under normal conditions - chrony shooting and can penetration. And then speed tests with heated bands. The numbers with heated bands are ALL far about 700 fps??!!
I took a bottle with cooked water to heat up the bands a few minutes before every shot. And then this numbers? Are there any experiences with chrony tests and heated bands. I think, these heated numbers are errors.
But ALL shots with non-heated bands were ok - all around 140 m/s; 460 fps! That`s strange - errors only with heated bands?! To fast for a chrony?
And: the water fast cooled down during the tests - the speed also decreased. The time between the first and the last shot was around 45 minutes.
I used 3 band sets - not more than 5 shots with every set :-(
And still no lengthwise tearing!

After the speed test I did some shots with this stuff on cans: a shot through 2 cans was no problem with this speed and ammo.
At the end of the video you see a little accident ( fortunately without injuries!!).

Here is the vid:

http://www.youtube.com/watch?v=arasZFuCXUA


Regards
Torsten

If you enjoyed reading about "890 fps possible with a simple slingshot!?" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
Flobert
September 24, 2010, 04:39 PM
Dam .......


(yeah Anderson dam's near me I gotta try fishin there sometime)

Dam ......

Vermonter
September 24, 2010, 05:57 PM
What's the weight of the 7.5mm steel balls?

MrOldLude
September 24, 2010, 06:09 PM
If you estimate about 7.9 grams/cm^3 time the volume, you'll have the mass.

torsten
September 24, 2010, 06:59 PM
The weight is 1,734 gramm ( 26,76 grains).

If you enjoyed reading about "890 fps possible with a simple slingshot!?" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!