I have a new mathews legacy on order with 28.5 draw and 60 pounds. I am trying to figure out what my arrow speed will be by using the speed calculator at bowjackson.com but I do not know anything about virtual mass, Bow Efficiency, or SE/PDF_Ratio. I need these numbers to use the calculator. My arrow will be about 405 grains and 29 inches. I am going to shoot the carbon express 3d select 300' s. With one nock and a peep and a caliper release. Any help would be appreciated.
Thanks

Here is you info, I do see one mistake I made on spine, the DL it set to 28 but you will still be in the green at 28.5

Hey Grndzer,

What program is that? Where could I get it?

Could you figure one out for me. Here is my set-up.

2003 BowTech MightyMite
72 pound draw weight
30" draw length
31" Beman I/C/S Camo Hunter 340 Arrows tipped with a 100 grain broadhead probablly a steelhead or rocky mountain snyper (total weight is 455.3 grains, which is 14.69 grains per inch of arrow (I divided the total arrow weight by 31 inches.)
I will be using a 80 pound let-off.
I will have a single nock, release loop, a set of string leech' s, and a dusk vision peep sight (with tube) on the string.
Also, I will be using a Tru-Fire Tornado release.

Thanks for the help. I just wanted to see what the chart says and compare it to what I actually get whenever I order my arrows.

Grndzer, I too am wondering if you can help me out. I posted this same question a couple weeks ago and got no response. I have no access to a chrony and would like to know my speed also.
' 94 Golden Eagle Pro Formula 3D
41" a to a
30" draw at 60 lbs single nock, cat whiskers and a peep (no tube)
27 1/4" Easton CarbonAeros Excel 400s with 125gr field points (naildrivers in fall) w/4" vanes weighing in at about 411 grn total

ANY help would be great!! Thanks

[&:] Oops. I do have an overdraw and my bow would be medium cams I think. Thanks again

The program is called The Archery Program. Tony has a website where you can download a free demo that is fully functional for 20 days. It is a great investment.

he goes by TAP in the message board.

I did better than I thought. Guessing from the IBO speed and what I know about set up , speed loss per pound, speed per weight in grains,draw length,etc. I came up with 247 fps. Let us know what it chrono' s I' ll bet that program is dead on the money !
Good Luck !!

In my experience, sense I didnt get to actually measure the BH or DL it will be with in +/- 7 fps. When possible it is always best to measure the bow not read the paper.

Thanks for running the program for me. I really appreciate the help. Can anyone tell me how to know a bows virtual mass, Bow Efficiency, or SE/PDF_Ratio.