This is the information posted about comparing strings as done by Ken Beck and originally posted Feb, 2010.
"TESTING STRINGS In response to a lot of interest in various string materials and “skinny” strings, we have performance tested several materials in both conventional and “skinny” versions to compare to our standard 14 strand DynaFLIGHT 97. Ray Caliendo (our milling machine guru and longtime string maker and expert) made the strings used for testing. The “skinny” strings had about half the strands but were padded in the loops to protect from what I call the “piano wire effect” that can split the limb tips. The center servings were also padded to get the desired arrow nock fit. For our purposes here, no silencers when installed.
Here is our testing protocol: For the recurve test, we selected a 60" PSA X. We chose to do the tests at a 30" draw (rather than 28") to maximize any benefit gained. The bow was braced at 8 1/ 4" and weighed on our electronic digital scale (0.1 increments) and it weighed in at 57.5#. Then we built an arrow that weighed exactly 517.5 grains (9 x 57.5#). (A higher brace would give a slightly higher draw weight and thus require a heavier arrow.) The shooting was done with our shooting machine. For each test, the bow was drawn with the winch to exactly 30" and the mechanical release was then activated. Each test requires only two or three shots through the chronograph. The readout will never vary more than one foot per second. If the first and second shots read the same (which is usually the case), we record this fps number. If not, we shoot a third arrow and record the two-out-of-three number. Since our chronograph does not measure in tenths of fps, our method is only accurate to within plus or minus 1/ 2 fps. A different chronograph might read faster or slower, but our testing protocol would produce the same consistency.
PSA X 60" RECURVE 57.5# @ 30" 517.5 grain arrow
DynaFLIGHT 97 14 strand 196 fps
Ultra Cam 16 strand 195 fps
Ultra Cam 8 strand 195 fps
Excellerent 12 strand 195 fps
Excellerent 8 strand 195 fps
Astro Flight 20 strand 195 fps
Astro Flight 10 strand 195 fps
Trophy 20 strand 196 fps
Trophy 12 strand 196 fps
D 10 18 strand 197 fps
D 10 12 strand 196 fps
We then tested a 60" (so we could use the same strings) PL X longbow of exactly the same draw weight at 30" with basically the same results, only 2 to 3 fps slower than the recurve. A 64" longbow would have been more suitable for a 30" draw and would have reduced the difference between the longbow and the recurve. We also compared speeds with and without the typical four Spider string silencers with a difference of 2-3 fps (2 fps on the DF 97}.
As you can see, it’s a washout. I was not surprised because I had tested an endless “skinny” string some time ago with the same result. Even though these 60" “skinny” strings (with padded loops and center serving) weigh 20 to 30 grains less (depending on which strand material), fewer strands allow more stretch or elasticity and we thus loose what we hoped to gain. The conventional D 10 string was 1 fps faster for both the recurve and longbow.
Well, there may be those who question these numbers and feel that the “Old Man” has gone over-the-hill and senility has set in. I would simply suggest “Grumpy” old man. So here’s the deal: Since I’m “from Missouri”, bring your Black Widow bow to Missouri with your properly padded “skinny” string and “show me”. Using the scientific testing method described above (you may determine the brace height), if you can achieve an additional 3 fps over a standard 14 strand DynaFLIGHT 97 string, we will build you a new Black Widow bow of your choice. BUT.... if you can not achieve an additional 3 fps, you must leave your Black Widow bow with us, OR.... pay for a new Black Widow bow that we will build for you. SUCH A DEAL! If there is a better mouse trap, we want to know about it! (This offer will expire 12-31-2010.)
I have also resurrected a post from the past entitled "TESTING & COMPARING BOW PERFORMANCE” for you to review.
Let me summerize: PHYSICS is PHYSICS is PHYSICS.... and you can’t get around it.
Ken Beck "
Hope this helps.
Topic: $110 well spent (Read 1046 times)
