arrow speed
 

is there a good way to determine arrow speed with out a chrono, im shoot 55#'s and 29" with a 552 grain arrow

RE: arrow speed
 

Probably fairly slow by todays standards. My guess would be less than 220.

RE: arrow speed
 

Simple with the following generalizations. Start with the IBO speed for your bow.

Subtract 10 fps for every inch of draw length you are below the 30 inch "test standard".

Next subtract approximately 1 fps for every 3-4 grains of arrow weight you are above the IBO "test standard" arrow weight of 350 grains. (a552 grain arrow would cost you about50-67 fps)

Next add or subtract approximately 1.75 fps for every pound of draw weigth you are eitherover or under, respectively, the IBO "test standard" weight of 70 pounds. In your case that means you lose approximately26 fps.

Lastly, subtract approximately 4-5 fps for every string accessory you have installed on the bow...peep sight, string silencers, string loop, etc...

Then take all of those numbers and subtract/add them to your IBO speed rating to determine a fair estimate as to your speed.

RE: arrow speed
 

What if u do not know the IBO speed,,and since it is a bow made for walmart it is not on hte PSE website,,unfortunetly,,need new bow

need money first,,if it aint broke dont fix it

RE: arrow speed
 

Try This, some one else posted it I just copied.


This chart works out pretty darn close. The only thing is you have to beable to shoot pretty good groups. The tighter your groups the better you can measure. Plus, you have to be dead nuts on sighted in to begin with. Anyway,,.... it does work. Use the bottom chart(the red one)where I've realigned them for easier reading. Shoot at a target from 20 yards away with your 20 yard pin. Have your spot near the top of the target because you have to allow room for the next group to fall low. Make sure you're on. Back up to 30 yards and shoot the same spot with your 20 yard pin AGAINMeasure the distance between the center of the two groups. Read from the chart to see your speed. For example: If you get a drop of 13 inches your speed is 258. The 60/30 foot chart(20 years/10 yards) chart is for really slow bows, like trad stuff.

DISTANCE= 90ft and 60ft (30yrds and 20yrds)

INCHES= 8 9 10 11 12 13 14 15 16 17 18 19
FPS=322 310 294 280 268 258 248 240 232 225 219 213

DISTANCE=60ft and 30ft (20yrds and10yrds)

INCHES= 5 6 7 8 9 10 11 12 13 14 15 16
FPS= 322 294 272 255 240 228 217 208 200 192 186 180


Drop in trajectory between 60 and 90 feet (20-30 yards)

Speed Drop


322 8
310 9
294 10
280 11
268 12
258 13
248 14
240 15
232 16
225 17

RE: arrow speed
 

thank alot for the chart preciate it

my bow is so slow prolly that i will need the 10/20 yard one,,hope not though:D:D

RE: arrow speed
 

Wow my new bow is pushing 322 fps. I have a drop of 6 to 7inche dropfrom 20 to 30 yards.This is a fast bow, not sure if it is that fast but wouldnt surprise me. Ill have to cronie it to see how close the chart is.

RE: arrow speed
 

If that's the chart from eders, it's not anywhere near close to right.

RE: arrow speed
 

I checked it against my chrono and it was way off, Like I said it was a copy and paste. Gonna delete it from my files.

RE: arrow speed
 

jerseyhunter
I cronied my bow last night and messured the drop, the chart was not close, as you noticed as well.. Not raggen on ya here;) you were trying to help out;).

I had a 5.5 inch drop and cronied my bow at an average speed of295 fps.