Hi guys,
I was wanting to know if anyone here could tell me of a program or maybe someone will possibly know how fast my bow is shooting. I am shooting a 346 grain arrow at 58lbs with a 28" draw, I really dont have access to a chronograph. Is there a program I could download from somewhere that could help me out in the future with such changes in arrow weight and draw weight. All input is much appreciated.

I might be able to help, however I need specific information.

Exact arrow your using, who makes it and what's it called, shaft length, tip weight, feathers, vanes, Turbo Nocks or what type, and how long and total arrow weight.

What bow are you shooting, exactly. Draw length, weight, brace height. What's the letoff, what string material or name of string and fingers or release?

I should be able to get it close.

Keith, I am shooting a Mathews Switchback 2005 model with a 28" draw and 58 lbs draw weight. I shoot 29" Easton Fatboy 400 with 80 grain glue ins and 2 inch Blazer vanes. I am shooting factory unibushing and super uni nocks with them. It has a 7" brace height and has the Zebra Barracuda string on it, shooting it with 80% letoff. I am also shooting a release with this setup.
Thanks for all the help, hope this is enough info.

Hey there 12ring I have this little formula I use it is not as good as some software but should get you in the ballpark. :peace: I hope this helps and it is good to meet you my archer friend.:biggrin1:


You can use the following to work backwards off listed IBO specs, this will put you pretty darn close to chrono:

IBO Specs - 30" draw/70lb draw weight and a 350gr arrow.

For every inch of draw length you go down you will lose 10 FPS

For every 5# draw weight you go down you will lose 10 FPS

For every 3 grains of weight your arrow is over IBO ( 5 grains per pound) you will lose 1 FPS

For every 3 grains of weight you add to your string you will lose 1 FPS.


Frank

I was hoping it wasn't a 2005 Bow, the update I don't have.
The specs say IBO of 318 and AMO of 241, under your conditions you are probably around 265/270. I know, probably not much help.

Heres mine- 05 Switchback
64lbs
329gr total arrow weight
27" draw length
Quik spins-CX Linejammers
string loop, kisser, and peep

257fps

Same setup except for hunting I use 3-d Selects, and I get 260:noidea:

Here's mine. Hoyt Ultramag. 366 gr arrow weight with a 27 1/2 inch draw pulling 60 lbs. 252 fps.

I was thinking about getting a new bow, but looking at the calculations, the new one would only be about 30 fps faster than my old bow. I was looking at the Martin Saber which has an IBO speed of 315-320 fps. I checked mine with a chronograph, and it shoots at 249 fps. I have a Hoyt Supreme with a 65 percent let-off, am shooting a 422 grain Cableas Hunter arrow, 30.5 inch draw lenghth at 60 pounds. The new bow would shoot about 280 fps.

there is a program called archers advantage at archersadvantage.com, or you have pinwheel software at pinwheelsoftware.com they have all kinds of software for archers.hope this helps.

Use this link, Ive found it to be with in 2 fps for all my bows in the past...







http://www.backcountrybowhunting.com/articles/tools.php







:rockon:

SPEED PLEASE
I shoot a PSE Whitetail Extreme with Brush Camo
30" Draw Length 60# max and 360 grain arrow weight minimum
Its set at 57# with 27" Carbon Express Maxima 350 arrows w/factory nocks
Its 30" draw length
Let off is 75%
PSE factory strings
8" brace hight
100 Grain tips screw ins
peep,2 limbsavers, nock loop, nock
Quikspin vanes 2" with white wraps
Tru-Fire Hurricane Extreme Buckle release
Not sure on the total arrow weight think its close to 350 grains

I tried the referenced arrow speed calc link and found that it was very close to my actual chrono speed.
I use a Bowtec pro 40 at 29 inches 50 to 60 lbs, whisker bisquit and a peep sight, arrow weight 347 grs. I clocked it at just under 270 average with finger release at full weight. Gonna try a mech release an see if it goes any faster. At 20-30 yds it makes my my old 45 lb recurve look like its standing still....no disrespect to the recurve... and to Bowtec is totally quiet smooth and fun to shoot.

I have a question about this formula below. I have the new Triumph and I changed the strings/cables to Vapor Trail. I took the speed balls (not sure what they are called) off of the old strings and put them on the VT's. My question is do these actually help with speed and if I leave them on do I count them as string weight in this formula? I wasn't sure if Mathews uses them on the string when they do the IBO speed quote of 325?

Thanks






Use this link, Ive found it to be with in 2 fps for all my bows in the past...







http://www.backcountrybowhunting.com/articles/tools.php







:rockon:

I have a question about this formula below. I have the new Triumph and I changed the strings/cables to Vapor Trail. I took the speed balls (not sure what they are called) off of the old strings and put them on the VT's. My question is do these actually help with speed and if I leave them on do I count them as string weight in this formula? I wasn't sure if Mathews uses them on the string when they do the IBO speed quote of 325?

Thanks

Yes they (speed nocks) help, but only if you place them in the correct location. Without them I've heard guys say they lost 8-10fps. I've never heard of anyone including them on the string weight portion when calculating arrow speed, but Im sure some have and were left scratching their heads...

You can go to www.pinwheelsoftware.com and download the free trial of Software for Archers.

In this program using your pin gaps it will calculate you speed for you.

good luck