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Bow IBO Data
Gold Tip Arrow Selector  Silent Clicker
Arrows: Spine... from .30 inch to over 1 inch in deflection. The higher the bow weight the more deflection.
Techniques
Tips
Dial test indicator
Spine Testers
FMP GO Template
Install GO on your IOS device and Use this template to Select Arrows

The measurable "power" of your bow - it's total kinetic energy output - ultimately depends upon just two variables: the mass of the arrow and the speed of the arrow. Kinetic energy of an arrow can be found by using the formula KE=(mv²)/450,240 where m = mass of the arrow in grains and v = velocity of the arrow in fps. If your bow setup ultimately shoots a 400 grain arrow at a respectable 250 fps (a typical field-output for a modern rig), your actual kinetic energy or "power" will be:


The Archery Trade Association standard for measuring arrow spine requires this test: Suspend a 1.94-pound weight at the shaft’s center, and use a machine to measure the deflection or bend at that point. Deflection is measured in inches. Some typical deflection measurements are .500, .400 and .350. These measurements correspond to the spine sizes most manufacturers use to mark arrows.


Easton Arrow Data



For Reference....

9mm bullet		 8.04 g (124 gr) Federal FMJ1,150 ft/s (350 m/s) 784.09 mph
364 ft⋅lbf (494 J)
Cross bow arrow
   300 ft/s
 55.53
Recurve arrow
   320 ft/s
Fastest compound arrow
   362 ft/s
Recurve Bow 50 average
   175 ft/s
Recurve 58

   200 ft/s      136mph




Compound bow 80 let off.
Archery Grains Scale
Calculator FPS to MPH

 Archery Software:
Spine Selector
Archers Advantage
On Target
Pinwheel Software
Calculators:
  • KE=(mv²)/450240
  • KE=[(400)(250²)]/450240
  • KE=25000000/450240
  • KE=55.53 ft-lbs

Compound Bow Speed database
Speed Calculator
Speed Calculator II

The faster an arrow travels, the flatter the flight trajectory and less deviation from wind. Recurve bow arrows can travel up to 225 feet per second (fps) or 150mph while compound bow arrows can travel up to 300fps (200mph).


Audio FPS

OCEN Audio app
Use Voice Memo or some other audio recorder. 8
USE Ikey?
20 yard range  60/time of audio file  = feet per second
10 yards  setup phone

60/.214=280.373832fps (this a compound bow)



 "i have a traditional shooter that finished 4th in the ibo world last year . he used to shoot a black widow . he changed bows this year and i think its a samick he shoots a 375 grain arrow both for competition and hunting and does real well . he gets 214fps out of it . hes big time into light arrow vs heavy arrow on many forums .has a couple arrow penetration videos on youtube did them at my shop ."
The first variable you need to look at is draw weight. As draw weight increases, so should arrow rigidity (spine). Also, we strongly recommend that you use an arrow with at least 5 grains of weight per pound or draw weight (if you are shooting a 60 lb. bow, you should use and arrow of not less than 300 grains).

Speed Test Video With Physics
Recurve Bow 60% efficient
Compound Bow 90% effieient
Chrony
Ebay Chronographs
Amazon Chronographs
28lb 137 fps
Recurve  290-330 FPS
Compound Bow  340 fps
CROSSBOW 420-450 FPS

FOC stands for Front of Center balance point. This measurement results from
 the relative weights of the components used in the arrow: shaft, insert, point,
fletching and nock. A properly balanced arrow measurements of 7 to 15%. For more information on understanding arrow weight and FOC
Kinetic EnergyHunting Usage
< 25 ft. lbsSmall Game (rabbit, groundhog, etc.)
25-41 ft. lbsMedium Game (deer, antelope, etc.)
42-65 ft. lbsLarge Game (elk, black bear, wild boar, etc.)
> 65 ft. lbs
Toughest Game (cape buffalo, grizzly, musk ox, etc.)




To answer that, let’s take a look at Easton’s Kinetic Energy Hunting Chart:

Below is a table of results for speed testing of Green Man Longbows. Click on the bow type for photos of that bow.

     

Bow Type

Gallery Number

Wood

Between Nocks

Draw Length

Draw Weight

Speed  ( FPS )

Speed Above Weight

1  

English Longbow018

Pacific Yew

72"

28"

38lb

172

34

2

Mongol Bow *

063

Horn, Yew, Sinew

48"

28"

27lb

159

32

3English Longbow040

Pacific Yew

72"

28"

47lb

177

30

4Composite Flat bow     013

Sinew backing, Pacific yew

66"

28"

45lb

173

28

5Laminated Longbow     

028

Hickory, Purpleheart, Rosewood

71"

28"

33lb

156

23

6Laminated Longbow039

Hickory, Purpleheart, Lemonwood

74"

28"

50lb

171

21

7Laminated Longbow     

022

Hickory, Lemonwood, Bloodwood

76"

28"

52lb

173

21

8

Mongolian Recurve

055

Buffalo horn, Bamboo, Sinew

51"

28"

40lb

160

20

9Laminated Longbow037

 Hickory, Yew (Take Down)

73"

28"

45lb

165

20

10English Longbow006

Pacific Yew

75"

28"

55lb

175

20

11

English Longbow

059

Pacific Yew

74"

28"

54lb

173

19

12English Longbow036

Pacific Yew

75"

28"

44lb

163

19

13Laminated longbow033

Hickory, Purpleheart, Lemonwood

76"

31"

64lb

183

19

14

English Longbow

043

Pacific Yew

72"

28"

47lb

165

18

15English Longbow017

Pacific Yew

79"

32"

47lb

165

18

16Laminated Longbow093

Hickory, Lemonwood, Snakewood

74"

28"

37lb

155

18

17Laminated Longbow     

041

Ash, Lemonwood, Bloodwood

75"

28"

40lb

158

18

18Laminated Longbow015

Hickory, Purpleheart, Lemonwood

72"

28"

45lb

163

18

19Laminated Longbow029

Hickory, Purpleheart, Osage

74"

29"

52lb

170

18

20Lemonwood Longbow020

Lemonwood (single piece)

74"

28"

39lb

157

18

21English Longbow000

Pacific Yew

68"

25"

43lb

160

17

22Laminated Longbow032

Hickory, Purpleheart, Lemonwood

72"

28"

44lb

161

17

23Laminated Longbow031

Bamboo, Yew

73"

28"

45lb

162

17

24Laminated Longbow023

Hickory, Purpleheart, Rosewood

75"

28"

32lb

149

17

25Lemonwood Longbow016

Lemonwood (single piece)

75"

28"

41lb

158

17

26

English Longbow

044

Pacific Yew

74"

28"

39lb

155

16

27English Longbow027

Pacific Yew

68"

27"

44lb

160

16

28Laminated Longbow014

Hickory, Purpleheart, Lemonwood

74"

28"

36lb

151

15

29English Longbow101

Bamboo, Purpleheart, Lemonwood

74"

27"

51lb

165

14

30English Longbow046

Pacific Yew

74"

28"

46lb

157

11

31Laminated Longbow029

Hickory, Purpleheart, Lemonwood

72"

28"

25lb

136

11

32Laminated Longbow092

Hickory,lemonwood, yew

74"

28"

55lb

166

11

33English longbow108

Pacific Yew

74"

27"

40lb

151

11

34English Longbow097

Pacific Yew

74"

27"

50lb

161

11

35Laminated Longbow030

Bamboo, Hickory,

75"

28"

29lb

137

8

36English Longbow090

Pacific Yew

74"

28"

52lb

159

7

37English Longbow102

Pacific Yew 'Silver Dragon'

72"

26"

40lb

141

1

Averages Depending On Bow Type

RECURVE BOWS

290-330 FPS. The classic bow requires a lot of kinetic energy that’s supplied by the archer, and that’s a good thing.

It makes every single shot customizable, and actually trains your endurance and muscles to withstand more arrow shots.

Recurves offer more health benefits than compound and crossbows, and for the human element present in successful high-FPS arrow shots, it’s a lot more skillful to be able to shoot one of these successfully.

recurve bow

COMPOUND

330-350 FPS.Compound bows are preferred by hunters for multiple reasons.

It’s the perfect in-between for recurves and crossbows, because it makes things a little bit easier with a let-off.That means you can pull the string back with 75-80% less force than you’re outputting thanks to the pulley and lever system.

This bit of leeway gives a compound bow a higher average FPS, and with modern innovations in its design, it supersedes the recurve just a little bit.

compound bow

CROSSBOW

420-450 FPS. Yes, that’s the average. The point of crossbows is to hunt, and in hunting, you need to be as humane as possible. There’s a reason why there are minimum requirements for draw weight; anything too low would be torturing, not hunting. With a 450 FPS draw weight, you could easily take down large targets with pinpoint accuracy.