Does this mean my draw length is a true

[indianalongbowshooter]

28 in. or what. I had my girlfriend mark my draw length on a shaft drawn to my normal draw and this is what I got- 26 1/4 to deepest part of the grip, 28 3/4 to the back of the riser(front of arrow rest). The bow is a 60@28 Super Diablo if that helps as far as riser width etc. Also the distance between the two marks is 2 1/2 inches....

[Danny Rowan]

Yes, the draw is to the front of the riser, so your draw is 28 3/4". With that bow you would be drawing almost 63# at your draw length.

Danny

[indianalongbowshooter]

Thanks Danny, thought thats what it was but wasnt ever sure...

[vermonster13]

AMO DRAW LENGTH STANDARD
For Manufacturers
Draw length is a specified distance, or the distance at the archer’s full draw, from
the nocking point on the string to the pivot point of the bow grip (or the theoretical
vertical projection of a tangency line to the pivot point parallel to the string)
plus 1 3/4”. Draw length from pivot point shall be designed at DLPP and shall be
called TRUE DRAW LENGTH.
EXAMPLE: 26 1/4” DLPP plus 1 3/4” is the equivalent of 28” draw.

From the AMO definitions.

[indianalongbowshooter]

So true Amo its 28 in., the reason I was wondering is I put a D-97 string on this bow for about 10 shots through the chronograph and it was getting 180 fps. with a 590 gr. 2216 at 9.8 gr. per#, seems like good speed for a older bow. Think about putting some micarta on the tips, the D-97 made it shoot like a completely different bow. I think this is a newer Diablo so it would more then likely hold up well, its quieter w/the D-97 and string leeches then it is with a B-50 and puffs, also about 10 fps. faster.

[ROB TAYLOR]

You're a 28" AMO (or now I think it's called the ATA) draw.  All those other points of reference for draw length are superfluous and serve only to confuse....Too bad more bowyers don't adhere to the industry standard.
-Rob

[Orion]

The AMO formula assumes a standardized riser depth of 1 3/4 inches, which is about what the Super Diablo riser depth should be.  I've never seen a Super Diablo with a riser that's 2 1/2 inches from the deepest part of the throat to the back of the bow.  Are you sure you measured everything correctly.  How were you able to measure to the throat of the riser at full draw?

[indianalongbowshooter]

There a dark mark in the wood on the riser that is exactly at the edge of the deepest part of the throat, had her mark the arrow there at full draw, will measure the riser width here in a bit...

The riser is exactly 3 in. from the front/back edge, from the deepest part of throat to back of riser is exactly 2 1/2 in.

[Tree man]

If I may be so bold.... The AMO standard for draw length is a horrid atrocity. The AMO standard established a baseline for comparing bow performance between various bows but does absolutely nothing of any practical value for the archer with one bow to match arrows to.

In days of olde when knights were bold,
Drawlength was quite forthright.
From anchored nock to bow's strained back
Duh, Harald you needn't lose any sleep t'night

[ChuckC]

This essentially means, when you state your actual draw length, it is your draw...with that particular bow.  It may change as you go to other bows.  

It should not change if you use the AMO or ATA calculated draw length, but that "true draw" doesn't help us out much when describing our needs.  

Example as above,if your "true draw" is 28, but you need a 29" arrow to allow your broad head to clear the back of the bow upon draw, that throws a monkey wrench into the calculation.  And...it changes the spine needs of the arrows you are using.
ChuckC

[Orion]

Would be interesting to see what the bow scales when drawn to 28 3/4 inches to the back (26 1/4 AMO).  Regardless, I'm not surprised at the speed you're getting, particularly with D-97.  The Super Diablo was/is one of the fastest if not the fastest bow in Howatt's line, and one of the fgastest around for its time.

[indianalongbowshooter]

With a B-50 string it shot a 28 1/4 in. 2216 w/175 gr. fieldtip alright but shot a little stiff with a slight wobble, with the D-97 string you cant see anyhing but feathers and it hits right where you look so the string weakens spine a bit and increased speed quite a bit.

[Ray Hammond]

I just put a clothespin on my shaft beyond the back of the riser...draw the bow to anchor, let down. Measure from nock throat to bow side edge of clothespin...that's what I call my draw length.

Obviously its going to be different with each bow...but that's what I use- my wife doesn't like coming down to the basement and fooling with tape measures for me.

[indianalongbowshooter]

Ray, thats what Ive always done but was wondering what it was according to AMO specs... really doesnt matter the bows gonna shoot the way its gonna shoot either way, we just have to make our arrows work...

[John Havard]

The power stored by a bow is only related to the two points where counter-balancing force is applied - where the throat of the grip is pushed and where the string is pulled.  An industry could not possibly do any better than to make a standard definition for draw weight at X" than by referring to those two points.  As Vermonster's copy of the definition clearly shows, it ain't rocket science to understand that AMO draw weight measured at AMO draw length is pretty simple.

[ChuckC]

John,  the way I understood it, those two points are not what are used (by AMO) but rather the deepest point PLUS 1.75".   In this case, what is a better indicator for general purposes...AMO draw length or total arrow length used, whatever the draw length. ?   The draw length might affect the power stroke, and once again, for that particular bow, but for most people (I am guessing here) wouldn't the total length be more useable, as it woud determine the spine needed to perform well ?
ChuckC

[George D. Stout]

First of all, the AMO standard was reset after the confound bows came about.  The original AMO was to the back of the bow, which makes more sense than anything with traditional bows, since you want your arrow to be able to clear a broadhead at that point.

My personal bows are weighed to the back of the riser at the sight window, as I have always done.
If they are marked 45 and are 48 when drawn to that point, then they are 48 since that is my draw to the back of the arrow head.

If you're spining your arrows to your bow, you must spine them for your draw, and that must be for the length you intend to shoot.  Not pivot area plust whatever.  The 1968 standards made sense then and still do now.

[John Havard]

Hi Chuck,

Sorry for any confusion.  I thought what I said was equivalent to AMO draw length.  You are absolutely correct - AMO draw is the weight needed to pull the string back a certain distance plus 1.75".  That's exactly how we measure our ACS bows.  So, for example, a 28" AMO draw weight actually has the arrow nock pulled 26.25" back from the low point (or the throat) of the grip.  26.25" plus 1.75" = 28".  I think that's pretty simple and have never understood why people get confused over such a simple measurement.  

True, that doesn't tell you what length arrow you need, but that's a different issue that marking the bow limb with its precise draw weight at a precise draw length.  George is exactly right in his preceding post.  Some people only draw 26" (24.25" back from the throat of the grip) and some people draw 30" (28.25" back from the throat of the grip).  I don't think it's reasonable to label every set of limbs with the draw weight at each inch of draw, so labeling them at some standard based on the two points of opposing force makes perfect sense to me.  What we do to help out our customers is to include draw weight measurements on each set of limbs from 25" AMO to 30" AMO on the owners manual we ship out with each set.  That way if the customer draws 25" AMO or 30" AMO they will know the exact draw weight of that particular set of limbs at each AMO draw length.  What length arrow they choose and what spine it needs is a function of how far they draw the bow and what the draw weight of the bow is at that draw length.  Again, sorry for any confusion I might have caused in my earlier post.