[Gun278]

Some were on here there is a formula on how to figure bow speed does anyone have a clue to where this is at.

 

[SouthShoreRat]

V=2FavSf10 over Md+1/2mfR-1, This assumes the potiential energy of the drawn bow is converted entirely into the arrows Kinetic energy: 1/2 mdu (2) = 1/2 ki (2) max=FavImaz where Fav=.5KImaz.
This works out to V=2FavImax over md

There is less room for error involved here than in ignoring altogether arrow to spring mass and distance ratios. This formula is a more complete and powerful tool for exporing an elastic to kinetic converison apparatus than using this formula V=2FavImax over md.
Problem is the essential difference between one formula and the other would be inserting the arbitrarily factor of 10 in the numerrator in order to fit experimental results and if the results are a tat different use:
V=e, 2FavImax over md this will account for the experimentally determined efficiency of the energy conversion from bow to arrow. The latter should accurately predict the speed of the launched arrow. :neutral:

 

[Guest]

I can show you Ross speeds from thier variuos bows-

http://ncarcheryshack.com/rossarchery/v ... oss+speeds

 

[SouthShoreRat]

I was just kidding I have no idea, just thought folks would get a good chuckle out the the crap above. I copied it off of the internet, the guys who put this together need to find something else to do with all of the time they have to sit around and figure this stuff out O MY GOD!!!!!!!!!!!!!!!!! 8)

 

[Gun278]

6 Pointer that was a good one I was saying to myself what the H### is this I have never seen this one. 8)

 

[Guest]

Here are some Calculators from the Archery Hut that I have used in the past.

http://www.thearcheryhut.com/calculators.php

 

[Gun278]

Thanks all

 

[SMOKEWAGON]

Once you know your arrow speed, you can use this chart.
http://home.att.net/~sajackson/ballistics.html

 

[roger]

mdewitt71,
You gave the Thumbs up to the calculators on Bill Pellegrino's web site (http://www.thearcheryhut.com). I'll take it as a compliment - I built Bill's web site for him.

I have just updated the calculator on my site - http://backcountrybowhunting.com/articles/tools.php

They still spit out the same but are a little easier to use.

Roger

 

[OwnMoreBone]

roger,
I just checked out your tools page. The one thing that I noticed, is that the approximate arrow speed should not be based on IBO. The calculation should be based on actual chrono speed ??? :-x

 

[roger]

My intention in the calculator was to help folks who don't have access to a chrono get an idea of what their speed might be. If I have access to a chrono then I don't need the calculator.

The testing I've done shows that the calc is usually within about 2-3 fps of the actual chrono'd speed.

And, honestly, I only use the calculator for 2 things.
1. To get a rough idea of what kinetic energy (KE) my setup is producing.
2. To show others the correlation between arrow weight, speed and KE. Run some different scenarios and one will find that there isn't much of a change in KE when the arrow weight is changed.

Hopefully it also creates some comfort for a shooter who feels compelled to shoot at a higher draw weight than what they're really comfortable with. i.e. If I can shoot better at 65#'s then why shoot at 70 since I'm not really gaining much in KE or speed.

I guess really the calculator is more for education than anything.

Rog

 

[Guest]

mdewitt71,
You gave the Thumbs up to the calculators on Bill Pellegrino's web site (http://www.thearcheryhut.com). I'll take it as a compliment - I built Bill's web site for him.

I have just updated the calculator on my site - http://backcountrybowhunting.com/articles/tools.php

They still spit out the same but are a little easier to use.

Roger

Cool!!!
Nice to meet ya, I may have to call on you to help build my webpage in the future.