[Rapture24]

2005 Diamond Rapture

60 lbs
27 inches

D-loop, 2 sims vibration dampeners, peep, one brass knock

Unknown brand of arrow (one my grandfather had laying around)- 362 grains - 260 fps

PSE Carbon 300 - 362.5 grains - 238 fps

PSE Carbon 200 - 344 grains - 256 fps

 

[Orion6]

Sounds about right. Plenty for deer if that's your game.

 

[6bloodychunks]

how did 2 arrows of almost exactly the same weight shoot so differently speedwise???

 

[Rapture24]

different spline i would imagine

 

[Orion6]

Yeah, that is kind of a big difference. I'd shoot both arrows a few more times.

 

[Rapture24]

Each arrow was shot multiple times, those #'s are the averages.

 

[6bloodychunks]

the spine wouldnt have any impact on the speed of identical weight arrows, are you sure of the weight of those arrows?

 

[XP35]

A friend is shooting an '05 Rapture at 60# and 27". He is shooting 26" GT XT 3555s with 100 grain heads and 4" vanes at 254fps. I am not sure of his arrow weight. But he has one of those God-awful giant peeps with the amber lens and an alignment tube. Once he loses that he will get a few more feet per second, I am sure. Your nubers seem odd, though, because the first arrow was so much faster and it shouldn't have been. Only weight is the issue, not spine.

 

[Myk]

how did 2 arrows of almost exactly the same weight shoot so differently speedwise???

Poor nock fit.
But that probably isn't what it is since the another one is the same brand as the slow one.

 

[BowhntrOma]

Spine will effect speed. If an arrow is grossly under spined the bow efficiency drops tremendously. An under spined arrow inhibits your bows ability to transfer energy to the arrow.

 

[Rapture24]

Spine will effect speed. If an arrow is grossly under spined the bow efficiency drops tremendously. An under spined arrow inhibits your bows ability to transfer energy to the arrow.

That's what I thought. The arrow bends and loses energy.

 

[pdq 5oh]

A PSE 200 won't be under spined with your bow. I shoot them out of my Allegiance at 60, 29". The 300 is even stiffer. I'd guess the unknown arrow is lighter than stated. There's really no way it can fly faster then an arrow that's 18 gr lighter.

 

[BowhntrOma]

A PSE 200 won't be under spined with your bow. I shoot them out of my Allegiance at 60, 29". The 300 is even stiffer. I'd guess the unknown arrow is lighter than stated. There's really no way it can fly faster then an arrow that's 18 gr lighter.

I would have to agree with this. The PSE 300 and 200 are both reasonable for your bow setup. The unknown arrow had to be much lighter. The only point I was trying to make was that spine can effect speed irregardless of arrow weight.

 

[pdq 5oh]

I agree. Spine can affect speed.