draw stop....bow timing?

[BT]

Aug 27, 2009 13:20:20 GMT -5 tkkracing said:

i will try to shoot the four arrows today ...the broad head ...will a rage practice tip work or should it be a fixed blade broadhead ...there is no contact with string on my chest

You definitely need a good fixed blade head.
Take your time because this is going to answer all questions and therefore give all answers.

[madoktor1]

Amen BT.

[tkkracing]

ok the results are in....15 yards was a bullseye......25 yards dropped 4 3/4 inches......30 yards dropped 10 1/2 inches all with field points the broadhead at 30 yards was 9 3/4 inch drop and 1 1/4 to the right......my bow is set at about 65# and 25 5/8" draw length.....arrows are 27" ...100 gr. points ....blazer vanes and 340 gr. total weight......just wanted to mention that the arrows had a visible wobble(vanes going in about 2-3 inch ovals)

[royden]

6" of drop in 5 yards!

Is there a good pro shop near you? Other than the one you have been using? Or someone at yours that you trust to do it right? My reasons for this are:

1) this post started with drawlength issues that I am not sure are resolved...
2) your arrows are 2" longer than your draw length (3" longer than I would have expected)
3) this sounds like too much drop for your bow.
4) In your shoes I would want to make sure the cams are timed correctly, and that the Axle-Axle, and Brace Height are in spec.
5) after all of that ... what is your arrow speed?

If a proshop is out of the question, can you get the current A-A, and BH and pics fo the cams showing cam rotation at rest? Chrony would be great too!

For starters you could move your rest a 1/32" at a time to the left - and see how that does to move FP/broadhead POI together. Was the broadhead a fixed blade???

hope that helps some....

jm .02

[BT]

Aug 29, 2009 14:16:46 GMT -5 tkkracing said:

ok the results are in....15 yards was a bullseye......25 yards dropped 4 3/4 inches......30 yards dropped 10 1/2 inches all with field points

The nock point is too high
or
the timing is out....and it is....I pointed that out on a previous post

the broadhead at 30 yards was 9 3/4 inch drop and 1 1/4 to the right

The rest needs to move left 1/16"

.....my bow is set at about 65# and 25 5/8" draw length.....arrows are 27" ...100 gr. points ....blazer vanes and 340 gr. total weight

forgot your chrono verified speed.
Do you have that?

......just wanted to mention that the arrows had a visible wobble(vanes going in about 2-3 inch ovals)

Thats because the rest is too high (timing) and the spine is being favored due to the rest being out of sync. with that spine value.

Royden also made a very good observational point.
Your arrow (not the head) should end 1/4" in front of the burger hole....not past the front of the riser.
With the arrow past center, any hand torque at all will be accentuated.
Wildly so if you are well past the forward portion of the riser.

[BT]

Not for nothing...you can compensate for the timing (sort of) by adjusting nock height.
Adjust the nock down until the arrow hits 15 and 22 yards without sight pin elevation adjustment.

[tkkracing]

when the bow was "tuned" it shot at 285 fps on the chrono...... i was shooting again this evening and reinjured my shoulder, but not nearly as bad this time...think it might be a muscle....

[BT]

285 is a 25 yard flat flight bow.....no argument to that fact.
Speed does not recognize arrow weight or bow weight.
That said....this is true when shot at 28" or better.

There are exceptions to the rule but generally, you can expect a 1 yard loss to every inch below 28"
This is due to the cast on the arrow which is based on the time/distance that the arrow remains on the string.
This is why short brace height bows are always the fastest at same weight/length/model

Based on this fact, you should be dead on 0-23 yards....at least.
Even if we said it was 22...that would have a elevation loss of only 11/2" @ 25 yards.
At 30 yards you would have an absolute total elevation loss of aprox. 5 1/2" (+/ - 1/2")

You are less than double that amount which suggests that timing is the more likely culprit, as opposed to nock height.
We have many threads pertaining to timing a bow.
If you have a press...I would gladly walk you through it.
It is relatively easy to do.

[Buckshot06]

Aug 29, 2009 21:14:31 GMT -5 BT said:

285 is a 25 yard flat flight bow.....no argument to that fact.
Speed does not recognize arrow weight or bow weight.
That said....this is true when shot at 28" or better.

There are exceptions to the rule but generally, you can expect a 1 yard loss to every inch below 28"
This is due to the cast on the arrow which is based on the time/distance that the arrow remains on the string.
This is why short brace height bows are always the fastest at same weight/length/model

Based on this fact, you should be dead on 0-23 yards....at least.
Even if we said it was 22...that would have a elevation loss of only 11/2" @ 25 yards.
At 30 yards you would have an absolute total elevation loss of aprox. 5 1/2" (+/ - 1/2")

You are less than double that amount which suggests that timing is the more likely culprit, as opposed to nock height.
We have many threads pertaining to timing a bow.
If you have a press...I would gladly walk you through it.
It is relatively easy to do.

I have one and would gladly help just for the hands on learning experience.
Let know tkkracing what you want to do

[BT]

Theres numbers first and then we get going
Just put the brace height and ATA up here to start
oh yeah...give me the current nock height off a T square