My new arrow
#21
Nontypical Buck
Join Date: Feb 2007
Location: Balt, MD (orig: J-town,PA) The bowels of Hell!!!
Posts: 2,188
RE: My new arrow
bruce
Have you thought about shortening the arrow a little to up FOC? It will probably only give you a small percentage change but will raise the FOC. Making the arrow 30" will give you about 3/4 of a percent increase if I have your arrow numbers close in Ontarget.
Also, anything that is done to lighten up the nock end will increase FOC.
Have you thought about shortening the arrow a little to up FOC? It will probably only give you a small percentage change but will raise the FOC. Making the arrow 30" will give you about 3/4 of a percent increase if I have your arrow numbers close in Ontarget.
Also, anything that is done to lighten up the nock end will increase FOC.
#22
RE: My new arrow
Wow 16 and 17% FOC, I think mine is almost 11%. 27inch goldtip prohunter with three blazers and a wrap on the back, and a 100 grain tip. Whatever works, think my total arrow weight is about 360grains.
#23
RE: My new arrow
ORIGINAL: davepjr71
bruce
Have you thought about shortening the arrow a little to up FOC? It will probably only give you a small percentage change but will raise the FOC. Making the arrow 30" will give you about 3/4 of a percent increase if I have your arrow numbers close in Ontarget.
Also, anything that is done to lighten up the nock end will increase FOC.
bruce
Have you thought about shortening the arrow a little to up FOC? It will probably only give you a small percentage change but will raise the FOC. Making the arrow 30" will give you about 3/4 of a percent increase if I have your arrow numbers close in Ontarget.
Also, anything that is done to lighten up the nock end will increase FOC.
#24
RE: My new arrow
Something interesting I noticed after making this arrow and putting the measured FPS numbers into OT was that my bow speed increased. I adjust the IBO speed so that the calculated speed matches the measured speed and I had the IBO speed at 285 for a lighter (434gr) arrow. When I adjusted the IBO speed to get the calculated speed to match the 534gr arrow I had to increase it to 293. I am assuming that there was a more efficient energy transfer to the arrow with the heavier weight. I thought that was interesting.
#25
RE: My new arrow
ORIGINAL: passthru79
Wow 16 and 17% FOC, I think mine is almost 11%. 27inch goldtip prohunter with three blazers and a wrap on the back, and a 100 grain tip. Whatever works, think my total arrow weight is about 360grains.
Wow 16 and 17% FOC, I think mine is almost 11%. 27inch goldtip prohunter with three blazers and a wrap on the back, and a 100 grain tip. Whatever works, think my total arrow weight is about 360grains.
#26
Nontypical Buck
Join Date: Feb 2007
Location: Balt, MD (orig: J-town,PA) The bowels of Hell!!!
Posts: 2,188
RE: My new arrow
Something seems off on the increased IBO speed. You shouldn't need to adjust the IBO speed of your bow. It is what it is. Just change the input numbers for the heavier arrow.
I've had the same thing happen to me with OT2. I was checking about 4 different arrows. The speeds were all over the place and then realized thatI needed to reset my basic inputs and then it would work fine.
The 500 gr arrow with a 12% FOC isn't to hard to build. Just get an arrow with camoon it that weighs about 12.2 gpi. Blazers, and about 29.5 inches long.
I've had the same thing happen to me with OT2. I was checking about 4 different arrows. The speeds were all over the place and then realized thatI needed to reset my basic inputs and then it would work fine.
The 500 gr arrow with a 12% FOC isn't to hard to build. Just get an arrow with camoon it that weighs about 12.2 gpi. Blazers, and about 29.5 inches long.
#28
RE: My new arrow
ORIGINAL: davepjr71
Something seems off on the increased IBO speed. You shouldn't need to adjust the IBO speed of your bow. It is what it is. Just change the input numbers for the heavier arrow.
Something seems off on the increased IBO speed. You shouldn't need to adjust the IBO speed of your bow. It is what it is. Just change the input numbers for the heavier arrow.
The bow performance slider can be used to change bow efficiency as it relates to the IBO/AMO velocity. Changing the slider will alter the the program calculation for arrow velocity. Altering the performance factor will also affect the way the program makes shaft selections on the Spine Match Tab. Using a higher performance factor will result in the program selecting stiffer shafts. A lower performance factor will result in weaker shafts being selected. If all you need to do is synch the program calculation to your known velocity, a better way is to just change the IBO or AMO velocity values until your known and the calculated velocities match.
OT2 is only as accurate as the numbers put it. I put in as many measured, known numbers as possible. Anyway all I did was synch the program calculation to my known velocity as outlined in the help file. And it seems that the numbers say my bow is more efficient at a higher arrow weight.
#29
RE: My new arrow
ORIGINAL: passthru79
I use to shoot a 75grain tip, that made my FOC pretty crappy. But still had very good arrow flight and awsome penetration.
I use to shoot a 75grain tip, that made my FOC pretty crappy. But still had very good arrow flight and awsome penetration.
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