Test of different fork extensions lengths.

Posted by Tex-Shooter, 08 April 2010 · 138 views

I have had several ask, how much speed and power fork extensions makes. Well I did some testing today with a set of my express bands (16 pound pull at 30 inches) and here are the results. I used the same set of bands on all four slingshots and shot 1/2 inch steel balls that weighed about 130 grain. ---------Saunders Hawk – draw length 32 inches – 186 FPS – 9.989 ft-lb or 13.543 joules.---------- Saunders Falcon II – draw length 35 inches – 197 FPS – 11.206 ft-lb or 15.192 joules. ---------- Saunders Wrist Rocket Pro – draw length 39 inches – 208 FPS – 12.492 ft-lb or 16.936 joules. ---------- My own Nova Star – draw length 45 inches – 232 FPS – 15.541 ft-lb or 21.07 joules.

ZDP-189
May 19 2010 10:23 PM

Tex thanks. That's good data.

I can use this to benchmark the PC Chrony. How are these draw figures measured? Are they elongation, or distance from fork to back of pouch, etc.?

Dan

Sam
Jul 16 2010 07:49 PM

Every last inch counts! Posted Image

ZDP-189
Dec 14 2010 05:54 AM

I wonder if you've considered standardising your velocity over all the slingshots you own, by altering the untied length. The ones with a longer draw would be a lighter pull, but the same velocity. That means each slingshot would shoot the same way and require the same elevation for a given range.BTW, what was the untied length you used here, please?