Arrow Decelleration

Roskoe · 03-04-2007, 11:01 AM

I'm wondering about how much an arrow slows down flying through the air. For instance, does a 60# bow hit as hard at 40 yards as a 50# bow hits at, say, 20 yards. Anyone have a ballpark idea of what sort of ballistic coefficient an arrow might have? I'm thinking that, due its length, it will be very high. Thanks. Roskoe

mobow · 03-04-2007, 12:25 PM

That's an interesting thought. I've never really thought about it specifically, though I know a heavier arrow maintains it's speed and energy longer than does a light one. I'm not sure how much the draw weight plays into the equation other than allowing you to shoot a heavier arrow....

Very interesting thought....

TFOX · 03-04-2007, 04:22 PM

Get an archery program like www.archersadvantage.com As much as you are playing with the numbers,the $60.00 will be well worth the money.

It is much more accurate than the one you were playing with on the net.

It will tell you what different setups shoot at different yardages and their ke at those yardages.

Roskoe · 03-04-2007, 04:35 PM

THanks, TFox. This numbers stuff matters to me, for some reason. Probably doesn't have muchapplication to field hunting, but I gotta know these things . . . .

TFOX · 03-04-2007, 04:37 PM

I ran some numbers of a 28 1/2" vectrix.

I used 6 grain per pound for each setup.

60# at 40 yards yielded 48.2 ft lb of ke. 360 gr arrow

50# at 20 yards yielded 45 ft lb of ke 300 gr arrow

The 50# bow shot the 360 grain arrow at 20 yards with 45.4 ft lb ke.

Roskoe · 03-04-2007, 04:54 PM

The difference in arrow weight is creating an "apples and oranges" conflict in my thought process. Can you determine, from that program, how the same arrow from the same bow holds its speed at 3 feet, 20 yards, 30 yards, 40 yards, and 50 yards? THx. Roskoe

TFOX · 03-04-2007, 04:58 PM

reread my post,I shot the same arrow also.

6 grain per # is apples to apples,shooting the same arrow is apples to oranges.

Roskoe · 03-04-2007, 05:10 PM

You lost me. Is there a feet per second loss, as the arrow flies through the air, that I can glean from this?

TFOX · 03-04-2007, 05:40 PM

Sorry,i was just responding to the apples to apples comment.

I used the 360 gr arrow out of the 50# and the 60# bow for the speed comparisons.

50# at bow 254 fps
20 yards 240 fps
30 yards 233 fps
40 yards 227 fps

60# at bow 278 fps
20 = 263 fps
30 = 256 fps
40 = 249 fps

NOW,the 50# bow with a 300 grain arrow

at bow 274 fps
20 = 259 fps
30 = 251 fps
40 = 243 fps

TFOX · 03-04-2007, 05:41 PM

The above numbers may not beEXACT, BUT the are very close.