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RE: How much KE are you shooting

Going by some chart or even a program isn't very accurate for your velocity. You need to get it chrono'd. As soon as you add or remove something from the string it changes. OT2 was off by over 12 fps for my bow and arrow set-up based on Factory IBO.

RE: How much KE are you shooting

What is wrong with this picture Im getting 52 lbs of KE. Im shooting a 25 1/4 in arrow at 8.2 gpi. That only gives me a 327 grain arrow? how is everyone else shooting so many grains? My arrow and broadhead are 307 with about 20 grains for fletchings.The last time i chronographed my arrow it was 265 if the chrono was even correct that is. what is the problem? I have to be shooting faster than 265! is it common to lose 45 fps off ibo?? with such a light arrow? Im a 28.5 in draw with 63 lbs on a hoyt havoctec

RE: How much KE are you shooting

06 BowTech Old Glory
30" @ 71 lbs.
505 grain A/C SuperSlim @ 265 fps
78.77 lb. ft.

RE: How much KE are you shooting

Quote:

ORIGINAL: stevezt4

What is wrong with this picture Im getting 52 lbs of KE. Im shooting a 25 1/4 in arrow at 8.2 gpi. That only gives me a 327 grain arrow? how is everyone else shooting so many grains? My arrow and broadhead are 307 with about 20 grains for fletchings.The last time i chronographed my arrow it was 265 if the chrono was even correct that is. what is the problem? I have to be shooting faster than 265! is it common to lose 45 fps off ibo?? with such a light arrow? Im a 28.5 in draw with 63 lbs on a hoyt havoctec

Draw length, draw weight, string silencers, arrow weight, real world... You loose about 10 fps per inch less than 30" draw and your weight is substantially less than 70 lbs. That means you're around 25 fps slower than IBO before you even add anything to the string or get a decent weight arrow, or shoot it through a chrono that isn't trying to lie to your customers to make them pick your bow over someone else's.

You're shooting a 25.25" arrow with a 28.5" draw length? Are you using an overdraw?

RE: How much KE are you shooting

Does anyone know what the actual formula for calculating KE is? Just curious. Thanks

RE: How much KE are you shooting

For an arrow = (arrow weight * velocity squared)/450240

RE: How much KE are you shooting

Yes i have an overdraw.I originally thought that would help my speed. It looks like i should just up the poundage, however ive never had any problems with getting pass throughs.

RE: How much KE are you shooting

28-30 pounds of KE for me - elk here I come !

RE: How much KE are you shooting

Your gonna hunt ELK with 30 lbs of KE??!!![:-]

RE: How much KE are you shooting

Quote:

For an arrow = (arrow weight * velocity squared)/450240

So is the velocity term here in feet/second? I am assuming it is since this is the most common measurment of velocity. Also, do you have any idea where the 450240 comes from? Just curiuos. Thanks for the formula though.