Ke & Slugs by feet

[kibok&ko]

 

Anybody can help me to find the calculation way of the Slugs / feet

Thanks you

K&K

[Killdeer]

Slugs ain't got but one foot.
1 slug = 1 foot.
End of equation.

Killdeer ~I am on to harder problems...  

[Bonebuster]

It`s all clear to me now.

[4runr]

UMM, OH BOY.

[kibok&ko]

????????????????


How to calcule it ?

[hormoan]

Say what, we lost something in the translation I believe

I'm with Killy though slugs have one foot

[freefeet]

"Zero" slugs for my two feet, thanks!  I hate standing on the slime oozers.

[Ray_G]

Perhaps Doc Ashby will chime in, if he is up and about.  I found the following articles about slug-feet / second that may help.  The calculations and results look like what he was using in the latest TBM article.

 http://www.alaskafrontierarchery.com/Articles.html

[kibok&ko]

Ok it's slug-feet / second .... sorry


Thank's fot the link

[[email protected]]

We gots lots of big slugs in Orygun!

Bob

[longbowman]

Drop me a private e-mail and I'll send them to you.

[O.L. Adcock]

Slug feet/sec is the unit of measure for an object's momentum.

MOMENTUM:  The unit of measurement for momentum is slug-feet per second.  A slug is a portion of the subset of coherent units known as the gravitational foot-pound-second system.  The physical weight of one slug of mass equals 32.174 pounds.  One slug of mass will acquire an acceleration of one foot per second per second when acted on by a one pound force (at sea level).

Here's the simplified formula for an arrow:


Momentum = Arrow Mass in grains x Arrow Velocity in feet per second, divided by 225218


In other words, momentum equals the arrow’s mass, measured in grains, multiplied by the arrow’s velocity, expressed in feet per second, and then divided by 225218.  The resultant answer will be the momentum, expressed in slug-feet per second.

Just FYI, 225218 is the product of 7000 x 32.174. There are 7000 grains per pound (that converts the arrow's mass in grains to pounds) multiplied by the gravitational constant 32.174 feet per second per second.

Hope that helps,

Ed

[wingnut]

Ed,

Got it, thanks.

What is considered a good Momentum number?

Mike

[O.L. Adcock]

Mike, that depends a lot on the specific arrow setup. How efficiently the arrow uses the force it has is more important that the exact level of force. I got some awfully amazing results (at least to me) in last year's buffalo testing with a 40#@27" Bear Formula Silver target recurve and some Ultra-EFOC arrows; having only 0.355 Slug Feet/Sec impact momentum and a measley 22.9 foot-pounds of impact KE.

Ed

[shantam]

dang these postings from ED under OLs handel are somewhat..well confusing me.

but who cares.

shantam

[kibok&ko]

thanks for the answer !

I calculate a 0,5 slugs by second form my set up