3 Rivers Dynamic Spine Calculator

[GregB]

Has anyone used the dynamic spine calculator on the #Rivers Archery site, if so how accurate is it? It was telling me for 57# at 28" shelf cut 3/16 past center, with a 30" arrow and 200 grain broadhead total weight 580-600 grains I would need a 250-300 spine arrow. This called for a stiffer spine than I was expecting to use. If you have a similar set up with your bow and arrows what spine are you using?

 

[Zak1215]

I used it, thought the suggestion was to stiff, but went ahead with its suggestion.

The arrows were to stiff. In the future I’m going to be buying the test kits.

 

[sndmn11]

It has been spot on for me in every instance. Some consideration needs to be given to the length of your inserts as a long insert effectively reduces the amount of available shaft to flex. You also need to be very honest about your actual draw length and weight.

 

[sndmn11]

I am shooting a 53@28 Rose Oak drawn to 30", and shoot a 250 GT Pierce with 110gr insert 250gr head cut to 30".

 

[GLB]

I use it. I think it gets you close. For one of my recurves 53 lbs I shoot CE 250 28.5" 100 grain insert and 150 BH.

 

[Beendare]

It gets me close. I've measured my setups to a knats azz...and its still is just a little off. No surpise; How would it account for my ILF setup that has some super efficient limbs...and some not as efficient?

 

[YankyMate]

I've used it a couple times, it's fairly accurate but seems to run stiff in my experience. I always double check my results with the manufacturers chart.

 

[GregB]

Thanks for the input. I think I'll buy a few different individual shafts and see which works the best. Then I'll have to start a Which Arrow Should I choose thread.