Easton Injexions and their consistency... Video Clip !!!!

[ontarget7]

Just figured I would share a quick clip of their spine consistency as well as straightness. I get guys asking if they are worth the price so I figured I would do a short clip of why they are worth it to me and the reason why I shoot them.
http://youtu.be/wMVNZRxNRZU

 

[Bowhuntr64]

Great review. Thanks Shane!

 

[5MilesBack]

I always read that the industry measures straightness along the middle 28" of their shafts. Have you found any issues with straightness for let's say a 30" arrow, going longer than the 28" for the injexions or any other arrows for that matter?

With 30" arrows, I can't exactly cut a lot off each end for the most part so I just hope for the best when I put a set together.

 

[bjaegers]

Well you have talked me into it ordering a dozen blank shafts. Would you mind sharing some detail on how you build your hunting arrows.

 

[ktowncamo]

I always read that the industry measures straightness along the middle 28" of their shafts. Have you found any issues with straightness for let's say a 30" arrow, going longer than the 28" for the injexions or any other arrows for that matter?

With 30" arrows, I can't exactly cut a lot off each end for the most part so I just hope for the best when I put a set together.

I can't speak for where exactly Easton is measuring for this, but one thing I do know is that whatever the "industry" is doing to measure something, Easton is generally going above and beyond to be sure that their measurement and performance standards exceed that of what the "normal" is.

 

[ontarget7]

I always read that the industry measures straightness along the middle 28" of their shafts. Have you found any issues with straightness for let's say a 30" arrow, going longer than the 28" for the injexions or any other arrows for that matter?

With 30" arrows, I can't exactly cut a lot off each end for the most part so I just hope for the best when I put a set together.

I have not and to be honest I feel the tolerances have gotten tighter over the years. I don't find really any advantage cutting from both ends. I have tested this for straightness with other arrows and found zero difference from the ones I did not cut from both ends. The biggest thing at your 30" raw shaft is the right spine selection depending on your setup

 

[Jeff Martin]

Although Easton's arrows are great and highly consistant , not sure the video shows me much. When you talk about GPI tolerances and spine, you typically would look at wall thickness consistancies which includes (inside the shaft) - not necessarily the external cir.

 

[ontarget7]

Although Easton's arrows are great and highly consistant , not sure the video shows me much. When you talk about GPI tolerances and spine, you typically would look at wall thickness consistancies which includes (inside the shaft) - not necessarily the external cir.

Not sure where you are getting your info on spine ? That is a spine tester that I used and the results were obvious. You cannot look at the inside walls of a shaft and just guess what the spine tolerance would be.

GPI tolerances would be measured through weighing each shaft and those numbers are just as tight.

Can you please explain how you would test them ?

Thanks
Shane

 

[Evan Williams]

Shane,

GREAT video! I was fortunate enough to be able to see the building process on the injexions and I wont be shooting anything else for a while!

 

[Jeff Martin]

Not sure where you are getting your info on spine ? That is a spine tester that I used and the results were obvious. You cannot look at the inside walls of a shaft and just guess what the spine tolerance would be.

GPI tolerances would be measured through weighing each shaft and those numbers are just as tight.

Can you please explain how you would test them ?

Thanks
Shane

I get my information form 20 years of experience. I in no way are suggesting your video was not done well or not accurate.

Having said that, when you are start to measure outside diameter as you did in the video, I was simply suggesting this is not a real measure of how consistent the arrows GPI will be. I think it goes without saying, arrows have two walls. The inside wall and outside wall and both must remain perfectly consistent or you will have variances in wall thicknesses, which leads to GPI tolerances.

You suggested weigh each arrow to see the GPI variances. Where do you think those variances come from? Simply put, it is wall thickness variances. If you look at Easton or any of the manufactures, you will see variances like +/- 2 grains for example. This tolerance is based on wall thickness. Yes, you measured the outside wall but there is also the inner wall.

Lastly, as the wall thickness changes, spine can change. Most highly particular arrow builders will fletch all the arrows on the defined spine of an arrow. If you do not find the spine constantly, the arrow will flex differently.

Let me illustrate this. Take a dozen arrows (unused) and put them in a bathtub of water. You will 100% see arrows role over like a log. This is the heavy side of that arrow . Try it.

TO that end, this is all splitting hairs and I do believe the Easton and Injections specfically are great arrows -perhaps #1? In fact, I am still shooting the ACC Superslim which in my opinion is basically the same arrow Easton ACC injection stopped making about 5 years ago.

Take care

 

[ontarget7]

I get my information form 20 years of experience. I in no way are suggesting your video was not done well or not accurate.

Having said that, when you are start to measure outside diameter as you did in the video, I was simply suggesting this is not a real measure of how consistent the arrows GPI will be. I think it goes without saying, arrows have two walls. The inside wall and outside wall and both must remain perfectly consistent or you will have variances in wall thicknesses, which leads to GPI tolerances.

You suggested weigh each arrow to see the GPI variances. Where do you think those variances come from? Simply put, it is wall thickness variances. If you look at Easton or any of the manufactures, you will see variances like +/- 2 grains for example. This tolerance is based on wall thickness. Yes, you measured the outside wall but there is also the inner wall.

Lastly, as the wall thickness changes, spine can change. Most highly particular arrow builders will fletch all the arrows on the defined spine of an arrow. If you do not find the spine constantly, the arrow will flex differently.

Let me illustrate this. Take a dozen arrows (unused) and put them in a bathtub of water. You will 100% see arrows role over like a log. This is the heavy side of that arrow . Try it.

TO that end, this is all splitting hairs and I do believe the Easton and Injections specfically are great arrows -perhaps #1? In fact, I am still shooting the ACC Superslim which in my opinion is basically the same arrow Easton ACC injection stopped making about 5 years ago.

Take care

Spine consistency is measured at a span of 28" and then with a 1.94# weight suspended in the middle of the shaft. With that said when you are rotating the shaft with the weight hanging in the middle you would be able to measure inconsistencies in the wall thicknesses. that was illustrated in that video clip.

Man floating arrows in a bath tub, haven't done that in quite some time LOL!

GPI has nothing to do with spine consistency, they are two completely different things. For instance, you can take a GT Pro Hunter shaft which is very tight on tolerance in GPI but not near as tight as Easton's Injexions, FMJ's or A/C/C's in spine consistency.

 

[OR Archer]

with the weight hanging in the middle you would be able to measure inconsistencies in the wall thicknesses

You also wouldn't want to measure on the labels either. This can skew your results depending on what the labeling is made of ie paint, sticker etc.

 

[ontarget7]

You also wouldn't want to measure on the labels either. This can skew your results depending on what the labeling is made of ie paint, sticker etc.

You guys are killing me, really LOL. Obviously if there is a raised area you would see it in the readings on the Ram Spine tester. Next time you get a chance look at a Injexion shaft at the label, you will not have any variance. Same goes with GT or Carbon Express etc. Not to mention when you test it for straightness the inconsistencies in the labeling would show up, this does not happen.

Now the factory cresting or any wrap that is another story.

 

[Lawnboi]

Great arrows now if only they would ship them without those stupid factory wraps

 

[ontarget7]

Great arrows now if only they would ship them without those stupid factory wraps

Couldn't agree more

 

[OR Archer]

I have seen this happen first hand when testing arrows for straightness. It can and does happen. That's why I suggest taking a reading in front of the label to minimize any variables. Just because you didn't experience does not mean it doesn't occur.

 

[Rucker61]

Great arrows now if only they would ship them without those stupid factory wraps

I had my shop scrape the wraps right off before fletching. They feel the same way we do.

 

[MattB]

Just an FYI, but I recently weighed a dozen full length Injexion shafts and the weight variance from high to low was 2.4 gr. - pretty good.

 

[ontarget7]

I have seen this happen first hand when testing arrows for straightness. It can and does happen. That's why I suggest taking a reading in front of the label to minimize any variables. Just because you didn't experience does not mean it doesn't occur.

What arrows ? Just curious, so I can test them to see and make a note of it when testing in the future. I tested last night the GT's, Easton's, Victory's, Carbon Express and Cheetah's, that I have on hand and had zero difference from label to bareshaft.

Thanks
Shane

 

[ontarget7]

I just weighed 2 dozen built arrows, all cut to the same raw shaft length. Out of that 2 dozen I had 2 weigh in at 418 gr, 2 at 420 gr and the rest came in at 419 gr not to shabby.