HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: IPutMoInYoA
New Today: 0
New Yesterday: 0
Overall: 13131

People Online:
Members: 0
Visitors: 117
BOT: 3
Total: 120
Who Is Where:
 Visitors:
01: Forums
02: Home
03: Home
04: Home
05: Forums
06: Home
07: Home
08: Home
09: Home
10: Forums
11: Your Account
12: Home
13: Forums
14: Photo Albums
15: Forums
16: Forums
17: Home
18: Home
19: Forums
20: Forums
21: Home
22: Forums
23: Forums
24: Home
25: Forums
26: Forums
27: Forums
28: Forums
29: Home
30: Forums
31: Photo Albums
32: Home
33: Home
34: Forums
35: Home
36: Forums
37: Forums
38: Forums
39: Forums
40: Home
41: Forums
42: Home
43: Home
44: Forums
45: Home
46: Forums
47: Home
48: Forums
49: Forums
50: Forums
51: Home
52: Forums
53: Forums
54: Forums
55: Home
56: Forums
57: Forums
58: Home
59: Home
60: Forums
61: Home
62: Forums
63: Home
64: Forums
65: Photo Albums
66: Forums
67: Forums
68: Home
69: Forums
70: Forums
71: Forums
72: Home
73: Forums
74: Home
75: Forums
76: Forums
77: Home
78: Home
79: Forums
80: Forums
81: Forums
82: Home
83: Forums
84: Home
85: Home
86: Forums
87: Your Account
88: Photo Albums
89: Forums
90: Photo Albums
91: Forums
92: Forums
93: Forums
94: Forums
95: Your Account
96: Forums
97: Forums
98: Home
99: Home
100: Home
101: Forums
102: Home
103: Forums
104: Home
105: Forums
106: Forums
107: Your Account
108: Forums
109: Home
110: Photo Albums
111: Home
112: Your Account
113: Home
114: Forums
115: Your Account
116: Your Account
117: Forums
  BOT:
01: Forums
02: Home
03: Home

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 308
 Pictures: 2452
  · Views: 824013
  · Votes: 1316
  · Comments: 86
 

Balistic coeffiant of Crossbows.
Hunting and discussion with Muzzle Loaders, Archery and other Primitive weapons

View previous topic :: View next topic  
Author Message
Dimitri
Super Member
Super Member


Joined: Nov 25, 2005
Posts: 5944

PostPosted: Tue Nov 07, 2006 5:41 pm    Post subject: Balistic coeffiant of Crossbows. Reply with quote

Well I was doing some testing and came to the conclusion crossbow bolts in 400gr have a balistic co-efficant of .07 Shocked

Using the information for balistics from Excaliber's site ( www.excaliburcrossbow.com/ ) and a online balistics calculator (Point blank Online doesnt like going that low in FPS it seems) (from this site www.biggameinfo.com/in...lcalc.ascx ) with a FPS of 350fps the arrow will be only 317.8fps at 50 yards so playing with the BC of the arrow I came to the conclusion is .07 Smile

Hope this helps someone. Very Happy

Dimitri

_________________
A thousand hills, but no birds in flight, ten thousand paths, with no people's tracks. A lonely boat, a straw-hatted old man, fishing alone in the cold river snow.
Back to top
View user's profile Photo Gallery
PaulS
Super Member
Super Member


Joined: Feb 18, 2006
Posts: 4330
Location: South-Eastern Washington - the State

PostPosted: Thu Nov 09, 2006 2:46 am    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

the calculations that are being used are calculated with a very low sectional density and the BC reflects that. If you could list the sectional density of the bolt for the crossbow you would get a much higher BC.

_________________
Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
Back to top
View user's profile Send e-mail
Dimitri
Super Member
Super Member


Joined: Nov 25, 2005
Posts: 5944

PostPosted: Thu Nov 09, 2006 5:41 am    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

Perhaps Paul, I dont know enough on the subject but its sort of nice having a better chart then is normally offered by crossbow manufactures to me. The SD was 0.357 (That calculated it I didn't). Smile

Tell me how do you calculate Sectional Desity ?? Confused

Dimitri

_________________
A thousand hills, but no birds in flight, ten thousand paths, with no people's tracks. A lonely boat, a straw-hatted old man, fishing alone in the cold river snow.
Back to top
View user's profile Photo Gallery
GroovyJack
Member
Member


Joined: May 21, 2005
Posts: 621
Location: Bama

PostPosted: Thu Nov 09, 2006 9:18 pm    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

Sectional Density is a bullets weight in pounds divided by its diameter squared ..IOW
150 grain 308 SD is 150/7000 / .094864 (.308 squared ) or .226
180 grain .308 SD is 180/7000 / .094864 ( .308 squared ) or .271
I dont see how you could get an accurate SD for a cross bolt , where' ya get the diameter ??

_________________
My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am
Back to top
View user's profile
Dimitri
Super Member
Super Member


Joined: Nov 25, 2005
Posts: 5944

PostPosted: Fri Nov 10, 2006 5:07 am    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

I wasnt sure what to put for the diameter so I used .400" Smile

Dimitri

_________________
A thousand hills, but no birds in flight, ten thousand paths, with no people's tracks. A lonely boat, a straw-hatted old man, fishing alone in the cold river snow.
Back to top
View user's profile Photo Gallery
GroovyJack
Member
Member


Joined: May 21, 2005
Posts: 621
Location: Bama

PostPosted: Fri Nov 10, 2006 7:16 am    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

No broadhead ?? I dont think SD with a crossbow relates to SD in a rifle , IOW , not comparing apples and apples ..
A 500 grain 458 bullet has an SD of .340 , and I dont think that crossbow bolt is gonna out penetrate the 458 ..
SD is a measure of ability to do work , comparing bullets , or looked at another way the higher the SD the harder it is to stop the bullet , or the more it penetrates , momentum .. Now that crossbolt may out penetrate the rifle bullet in a bag of sand , but which ya want with a mad bull elephant ??
Changing subject , I'm curious , why a crossbow ??

_________________
My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am
Back to top
View user's profile
Dimitri
Super Member
Super Member


Joined: Nov 25, 2005
Posts: 5944

PostPosted: Fri Nov 10, 2006 3:22 pm    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

GroovyJack,

I've got a broad head on them but I discounted it for my calculations. As most broad heads supposidly shoot pretty much the same as feild points. Wink

Reason for the crossbow is we have archery season from the start of Octomber to the End of Decemeber. And in theory you can get up to 6 EXTRA Buck or Doe Archery tags (for a total of 7 deer tags with the General Buck tag) here so it lets me hunt more. Smile Eventhough to be honest I havnt seen a deer (well close enough to shoot) yet this season but I've only been out 2 times.

But I only have 2 tags didnt get many just my general tag and a doe validation sticker for it for the area I've been going to and another achery tag for another area I might end up going once or twice so I figured I might as well get a seperate tag so I can get a buck or doe there and still have my general tag. Smile

Dimitri

_________________
A thousand hills, but no birds in flight, ten thousand paths, with no people's tracks. A lonely boat, a straw-hatted old man, fishing alone in the cold river snow.
Back to top
View user's profile Photo Gallery
PaulS
Super Member
Super Member


Joined: Feb 18, 2006
Posts: 4330
Location: South-Eastern Washington - the State

PostPosted: Sat Nov 11, 2006 7:31 pm    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

what makes you think that two 400 grain 40 caliber projectiles won't penetrate the same distance if one happens to be 20 inches long and the other is a lead bullet?
They have the same weight and the same cross-sectional area? The biggest difference is the resistance caused by the area of the sides - the longer the sides the quicker it will decellerate.

_________________
Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
Back to top
View user's profile Send e-mail
ammohouse
Rookie Member
Rookie Member


Joined: Aug 05, 2006
Posts: 5
Location: South Dakota

PostPosted: Sat Nov 25, 2006 10:52 pm    Post subject: Re: Balistic coeffiant of Crossbows. Reply with quote

I'm new here but the new crossbows ain't primitive weapons.

_________________
Don't Squat with your Spurs on!!!
Back to top
View user's profile Photo Gallery
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Primitive Weapons Hunting
Page 1 of 1
All times are GMT - 7 Hours



Jump to:  


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Valid CSS! Valid HTML 4.01!
Click to check if this page is realy HTML 4.01 compliant for speed :)

All logos and trademarks in this site are property of HuntingNut.com.
The comments are property of their posters, all the rest © 2011 by HuntingNut.com
Interactive software released under GNU GPL, Code Credits, Privacy Policy

.: Upgraded to DragonFly 9.2 by *Dizfunkshunal* :.