Kenetic energy
08-14-2003, 08:35 AM
#32
Nontypical Buck
Join Date: Feb 2003
Location: Virginia / West Virginia
Posts: 4,906
RE: Kenetic energy
NOT saying that cut to tip heads are " BAD" , just saying that at higher arrow speeds, a broadhead with less surface area (most NON cut to tip heads....shorter blades) will GENERALLY penetrate as well or BETTER than a cut to tip head.
Taz...most say 55lbs of KE is enough, but if it was me...if I ever did shoot a mech, I' d personally want to be higher.
08-14-2003, 09:00 AM
#33
Boone & Crockett
Join Date: Feb 2003
Location: Fredericksburg Virginia USA
Posts: 13,672
RE: Kenetic energy
Okay two more questions for the gurus.
1. What weight arrows are used to establish the IBO speed of a bow?
2. How would you determine approximently how many FPS are lost per gram of arrow weight above the IBO weight?
1. What weight arrows are used to establish the IBO speed of a bow?
2. How would you determine approximently how many FPS are lost per gram of arrow weight above the IBO weight?
08-14-2003, 10:42 AM
#34
Join Date: Feb 2003
Location: East Yapank NY USA
Posts: 3,457
RE: Kenetic energy
Just a quick question here, what would you say is the minimum KE for shooting mechs?
heads like the snipers and the small 2 blade rockets can IMO be shot at under 55 lbs.
And swing back 3 blade heads with large 1.5" and 2.0" cuts should IMO be used with more ke.
08-14-2003, 10:52 AM
#35
Join Date: Aug 2003
Posts: 174
RE: Kenetic energy
Guys, you prove MY point. Pushing a cut to tip through leather IS easier....you are at the extreme slow end of the scale (less than 1fps...HOW does THAT relate to the real world?). As speed increases, it gets eaier and easier to go through the leather. When shooting an animal, you have to go through something much thiker than a peice of leather. The entire head is surrounded by matterial. The HUGE surface area of the cut to tip heads causes more drag than the replaceable blade heads (or even a mech head...BLASPHAMY....or is it?).
like cutting through a block of cheese, the less surface area, the easier it is to cut. hence cheese cutters are VERY dull, but have VERY little surface area (peice of wire).
Try to cut grass with a razor moving at 1 fps...then open up the weedwhacker with it' s super dull mono line...a bit easier...even though the razor has a MUCH higher KE (It' s weight, plus the weight of your arm/body).
None of this REALLY matters, as long as you put the head where it belongs. Indians killed deer with jagged rocks tied to bent sticks for cripes sake!
like cutting through a block of cheese, the less surface area, the easier it is to cut. hence cheese cutters are VERY dull, but have VERY little surface area (peice of wire).
Try to cut grass with a razor moving at 1 fps...then open up the weedwhacker with it' s super dull mono line...a bit easier...even though the razor has a MUCH higher KE (It' s weight, plus the weight of your arm/body).
None of this REALLY matters, as long as you put the head where it belongs. Indians killed deer with jagged rocks tied to bent sticks for cripes sake!
08-14-2003, 12:03 PM
#37
Join Date: Jul 2003
Location: Tulsa, Oklahoma
Posts: 1,051
RE: Kenetic energy
Hoyt lists the Deviator at your specs (70#/30" ) at 9grs/lb. at 239-245fps. ( THAT' s with a 630gr arrow).........which equals 80-84ft lbs of KE. Nothing to sneeze at for sure, but that' s at 70# not 67# and with an arrow 100grs HEAVIER than yours
And it wasn' t just one chronograph I shot thru. If you read the post, it was several, different ones, owned by different people, at different archery events. But, this is getting ridiculous and taking away from the original question of this thread. Have a nice day.
08-14-2003, 03:33 PM
#38
Join Date: Feb 2003
Location: Homer LA USA
Posts: 97
RE: Kenetic energy
Danny45,
That bow could reach those claims. The performa cams on a deviator would get a 520 grain arrow close to 285. that would give about 93 to 94 ft-lbs. I believe tha AMO rating was around 253 ( something like that)
Awesome number but a real bear to shoot. A buddy had one. I have to say it was awesome but I couldn' t handle the speed.
That bow could reach those claims. The performa cams on a deviator would get a 520 grain arrow close to 285. that would give about 93 to 94 ft-lbs. I believe tha AMO rating was around 253 ( something like that)
Awesome number but a real bear to shoot. A buddy had one. I have to say it was awesome but I couldn' t handle the speed.
08-15-2003, 12:01 AM
#39
Join Date: Aug 2003
Posts: 174
RE: Kenetic energy
Odd then that my steel-force heads got the LOWEST penetration in my tests (Very repeatable)
In most recent testing, Slick trick was #1 Shockwave #2 Muzzy 3 blade #3 and Steelforce #4
All 100gn heads, shoot on the same arrow/s out of the same bow on the same day. at 270 fps (+/- 3 fps)
In most recent testing, Slick trick was #1 Shockwave #2 Muzzy 3 blade #3 and Steelforce #4
All 100gn heads, shoot on the same arrow/s out of the same bow on the same day. at 270 fps (+/- 3 fps)
