Arrows

[at1010]

Ok - dumb question but I have to throw it out there.

I’ve shot VAP micro diam arrows with outsert for a year or two. They fly well and I’ve killed a bunch of deer with them.

i had a few carbon express (larger diam arrows) and I wanted to see how they grouped at 20 compared to my VAP.

I was absolutely shocked they hit 2-3 inches higher, consistently. Now I would have thought the heavier arrow would have hit lower (if anything). Why did this happen?

@jagermeister @brock ratcliff ?! Any others got ideas?

 

[Sgt Fury]

The difference in spine could make one arrow stiffer coming off of the rest. Also, are you sure the smaller diameter arrow is lighter? Just because an arrow has a larger diameter doesnt mean it’s heavier.

 

[at1010]

The difference in spine could make one arrow stiffer coming off of the rest. Also, are you sure the smaller diameter arrow is lighter? Just because an arrow has a larger diameter doesnt mean it’s heavier.

I am going off memory - but now that you say that - I think your right about the spine difference!!

I’m not a great archer. I just like shooting deer in ribs haha so excuse my ignorance folks.

 

[Hunter II]

The larger arrow will sit higher in the rest. Could be throwing it off.

 

[at1010]

The larger arrow will sit higher in the rest. Could be throwing it off.

It’s a drop away but I suspect that could still be the cause

 

[TinyTucky]

Which VAP series and which Carbon Express arrows? Are you shooting weighted in or outserts on the VAPs vs the Carbon Express’? Could also be a difference in spine like @Sgt Fury said.

 

[at1010]

Which VAP series and which Carbon Express arrows? Are you shooting weighted in or outserts on the VAPs vs the Carbon Express’? Could also be a difference in spine like @Sgt Fury said.

I forget what VAPs. I’ll look
Weighted outserts
Non weight on CE

 

[jagermeister]

Without knowing the actual weight of each arrow we are merely speculating.

The larger diameter arrow will also have its centerline slightly higher on the rest than the VAP arrows, resulting in a slightly nock-low/rest-high situation. That could result in the higher POI with the larger diameter arrows.

 

[Cogz]

Are they the same length? Also consider gpi (grains per inch)

 

[bowhunter1023]

Without knowing the actual weight of each arrow we are merely speculating.

The larger diameter arrow will also have its centerline slightly higher on the rest than the VAP arrows, resulting in a slightly nock-low/rest-high situation. That could result in the higher POI with the larger diameter arrows.

JB hit on the two thoughts I had regarding total arrow weight/length and a slight change in the nock position in relation to the rest. Subtle differences in spine and FOC are also variables to consider.

 

[Jackalope]

When I was building an arrow for elk I ran into this exact same issue, It turns out one set of arrows was just a little heavier than the other. Same GPI and same length. The only difference was in the vanes as I was trying different sizes. I want to say it was just 4-5 grains heavier total weight but the vanes were larger meaning more drag also. Heavier in the butt + more drag = a couple inches extra drop at 40 yards.

So one would think I should go with the lighter set that hit higher, but once I screwed fixed blade heads on they got erratic. Those micro vanes didn't have enough ass to stabilize the head so I went with the heavier, larger, ones.

 

[at1010]

Thanks guys! I am happy with how my VAP shoot - so I’ll stick with those.

I was curious and this all makes sense as to what causes the slightly higher impact.