Something to Ponder

[Rangeball]

I did some rough calculating involving heavy arrows flung from a 29" DL Allegience pulling 70#s, and came up with a mind boggling numbers. Having fallen into this trap before and being fooled since many high performance cams don't seem to be as efficient at heavier arrow weights, I emailed Pat to see what the AMO is.

Pat told me they don't AMO their bows, but he did fling some different weighted arrows through the chrony and gave me the results. Doing some quick extrapolating from his tests to my desired set up, ponder this-

A 70# allegiance drawn 29" should fling a 550 grain arrow approximately 275 fps, for a whalloping 92 foot #s of KE, and momentum out the ying yang.

Easy to tune, easy to draw and hits like a mack fricking truck... Mercy.

[buckeye]

A 70# allegiance drawn 29" should fling a 550 grain arrow approximately 275 fps, for a whalloping 92 foot #s of KE, and momentum out the ying yang.

Thats with the hush kit and nock set

[CBM SC]

I'm pondering ??????

But how can you get 275 fps out of a bow that IBO's 328 max after it's dropped an inch in draw length , set up with a hush kit, and shooting an arrow 200 grains over ! That has to be the most efficient cam system ever .........and maybe it is ! I will definately go test one when it comes in !

[silentassassin]

I can't see those numbers coming to fruition. The allegiance has roughly the same IBO as my SC Patriot and I am shooting a 30" draw and a 444 gr. arrow about 287 fps with a bare string. Not that that is anything to sneeze at by any means. But if you added another 106 grains of arrow weight that would account for a minimum of 30 fps speed loss and that is with an inch more draw length. So, I just don't see how those numbers are going to work out. If you make it an 80 lb bow and added an inch of draw length that would appear to be closer based on the specs provided, unless I have missed something.

[sho-me_bhntr]

i agree with silentassassin, 275fps is a hefty number for that set-up. i would love to see actual numbers though...

[Matt / PA]

Rangeball,
I'm assuming you are figuring your calculations from these numbers.........(with hush kit of course)
Ponder these numbers.......these are the actual test numbers for a 28"/61# Allegiance

28"/61# (measured) shot a 536gr 2117 at 237fps. (67ft lbs of KE!) From a 28"/60# bow with a 7" brace height.
Think about those numbers for a minute.[:-]

That's 28"/61#.

It seems like this cam system is EXTREMELY efficient with heavy arrows.

That same bow shot a 301gr arrow 306fps (62ft lbs of KE) and a 398gr arrow 272fps......that's losing 1fps for every 2.85 grs added.

Now take that same 301gr arrow and factor in the 536gr arrow at 237fps. That's a loss of only 69fps for an addition of 235grs of arrow weight on a 28" draw length bow! The efficiency increases to 1fps lost for every 3.4grs added.

[Rangeball]

Matt, that seems like them

Ok, I just realized I figured for a 30" draw, not 29". At 29" it should do 265ish, for just under 86#s of KE... Probably still more than adequate.

But for you fellers with arms... Mercy...

[Matt / PA]

I'm going to go out on a limb here, and say that they are going to sell a few of these things this year.[:-]
And oh yeah........it draws smooth!

I'm almost giddy thinking about these bows. (Me and my 30" draw length)

I was intending to shoot a 30" / 70# Allegiance for the 2005 hunting season. Anyone make a 4" cutting diameter mechanical head?

[bayfire300]

hi guys i just wanna add i was inches from buying a mathews and then i read some posts on here about bowtechs..i never held one in my hand b4 and found a brand new one on e-bay(mighty mite) and i absolutly love it.
i am shooting 27.5' ics 400's 390 grain... 28" draw ...70#'s and i'm getting 295 w/ hush kit..........recently i removed the silencers from the string and installed string leeches and gained 3 fps.oh yea peep and string loop.
whisker biscuit rest

just my 2 cents


otto

[JoshKeller]

Hey Matt... If they have these available in a 31" draw so I dont have to "short draw" my 30" Liberty, I'm sold!

2005 Allegiance at 70 lbs + 31"+ 560 grain arrows = enough penetration to go through a Buick!