Tech numbers

[ECRESS]

Ok guys this is for you tech fellas. I took some reading of my boss today and here's what I got see if you agree. Black hunter long bow factory 55# at 25" draw 46# 514 gr arrow 11.17 gpi 138 fps.
Black hunter recurve factory 50# 24 1/4in draw 42# 476gr 11.33gpi 136fps.
Bear black panther 44# 25in draw at 36# 420arrow 11.66gpi 135 fps.
Sound right? And is this good set ups? Indiana is 35# legal. Thanks

[McDave]

Just a FYI, gpi = grains per inch, or the weight of 1" of shaft, which for a carbon arrow will generally be in the range of 6-8 gpi.  I think you mean gpp, which is grains per pound, which is the weight of the arrow divided by the pounds pull at your draw weight.  Your calculated amounts are between 11-12 gpp, which would be in the range of what many hunters would like.  I prefer 9-10 gpp for hunting, but I am old fashioned.

You are probably using 3 pounds per inch to calculate your actual draw weight compared with the marked weight on the bow (unless you are actually measuring your draw weight).  I have found that 3 pounds per inch is more appropriate for higher poundage bows.  I think your weight loss would be more like 2 pounds per inch, so your actual draw weight may be higher than you calculated.

Your arrow velocities are in the ballpark of what I would expect to see from your setup.  Obviously, if you chose to use arrows in the 10 gpp range, your velocity would increase.  Many people hunt with bows pulling 40# or more at their draw weight.  I would consider 36# to be marginal, although your actual draw weight may be a little higher than that.

[ECRESS]

Gpp I'd what I meant but phone kept changing it to gpi so just left it. So you still got the point though. And yes the draw waights are actual tested on two different scales. Arrow where waights on two different gr scales and averagd.i agree 36 is marginal just kind amazed the speed of that bow was right with the others. Thanks

[McDave]

That's the beauty of gpp.  If you get in the habit of using close to the same gpp, you can go up or down in bow weight without seeing much difference in velocity.  Of course, different bow designs will also influence velocity.