Speed calculator

[huntergale]

about how fast should gt500 be at 65lbs with 344arrow?

[huntergale]

28.5 draw 4got

[dcgameslayer]

about how fast should gt500 be at 65lbs with 344arrow?

I got between 300-302 on both calculators with your setup I added 20 grains for loop and peep.

[Innova]

Hello everyone,

I am the guy that wrote the calculator that is linked in the first post. I just happened to look at my logs, and noticed quite a few hits coming from this thread.

I decided to post for a couple reasons. First, a brand new calculator has just been put up. The link will now redirect to http://utopiaprogramming.com/ke/index.html. If you have bookmarks, you can update them. The numbers the calculator outputs will still be the same, but it is now easier to use.

I welcome any suggestions you have for improving it.

Secondly, as you have noticed, the speed calculations are an estimate. But I have found them to be very close. The most likely thing to cause the speed estimate to be off, is weight on the string. Weight in the center of the string (nock, loop, etc) will slow the arrow down. However, the further you move out on the string, the less impact the weight will have. It can even cause the arrow to increase speed up if it is far enough out.

Thanks,
Wesley (Buck) Lemke

PS, if for some reason, you still like the old version better, it is available at http://utopiaprogramming.com/ke/ke.php

I would like to let everyone know that I have made a version of the Kinetic Energy Calculator available for Android phones. If you are interested, you can click the following links (on your android device) to download the app:

Free, ad supported version

No ads, $1.00 version

Thanks, and let me know if you have any questions!

[Uremabgt]

This deserves a sticky. .One of the key points is to get the IBO # correct which some bows vary in their postings.

[2011 Elite Hunter]

how does this work exactly? i did it but dont understand the numbers its giving me like adjustments and that? I shoot 60# 28"DL/8gr per inch on my arrow, with a 100gr broadhead. So total arrow weight would be 324 correct?

[Rick]

just get the archery chrono App. I'ts very accurate.

[Innova]

how does this work exactly? i did it but dont understand the numbers its giving me like adjustments and that? I shoot 60# 28"DL/8gr per inch on my arrow, with a 100gr broadhead. So total arrow weight would be 324 correct?

If your draw length is 28" then your arrow length is probably 29, or 29.5".

So: 29 (length) * 8 (grains per inch) = 232 grains. Add 100gr for the broadhead, and about 15 gr for the nock/vanes (estimated) and you get a total of: 347 gr for your arrow.