Hardest lessons to learn in archery – Watch the weight Or why we need to watch our weight

No not a comment on obesity in archery but a quick look at how weight in many different forms can effect archery, whether we are talking about the draw weight of your bow or the weight of the arrows used.

So when can too light be a bad thing, and again I’m not talking about the archers weight here or anorexic, but in fact arrow weights.

Before I launch into this article though I’d like to thank my guest co-author another Rob, Rob Cook.

Rob Cook

Rob Cook

As many of you know I’m a big traditional archer shooting wooden bows and wooden arrows, so when it came to checking my facts with carbon arrows and so on, so I enlisted Robs help. Rob was also one of the originators of the new Traditional Bow hunter class in the NFAS and has extensive knowledge on the bare bow scene.

Bow International ran an article a few issues back on the effect of arrows weights on arrow flight and I know other sites including The Push have talked about the importance of matching your arrows to the bow.

Too light an arrow and archers can encounter several issues. Light arrows can fly faster and some say further, but they can be affected by wind to a greater degree. also there may not be the mass weight to absorb the energy from the bow limbs on release as effectively. in essence its like a mini dry fire.

Most bow manufacturers will specify an optimum mass weight for your arrow and if you look on just about ever carbon arrow in production will give you an arrow weight in grains per inch

To give you an example of what I mean, a bow maker might say the arrow should be 9 grains per pound of draw weight, so for my draw weight of 45lbs that would be 405 grain arrow weight. Through a lot of trial and error I have found an arrow round 450 to 460 works best from the bow, anything below 420 and the bow becomes noisy  and the arrows don’t perform as well.

Rob has created this table of data on different arrow specs and weights for some of the more common arrows on the market. We’ve used a 100 grain pile in all the arrows below calculations and show two lengths 28 inches and 30 inches, so we can give a total weight. To keep it simple Rob has used a 45lb bow weight for spine as I used that weight in the above calculation. It should all make sense but if you have any questions let us know.

Manufacturer Shaft Type                    spine @28 Arrow Weight gpp spine @ 30 Arrow Weight gpp
Avalon TecOne 600 330 7.3 600 344 7.6
Beman Classic 600 367 8.2 500 434 9.6
Carbon Express Predator II 2040 354 7.9 2040 370 8.2
Carbon Express Heritage 75 388 8.6 90 424 9.4
Easton Carbon One 660 325 7.2 550 347 7.7
Easton Axis 600 340 7.6 600 355 7.9
Easton 5MM Axis Traditional 600 357 7.9 600 373 8.3
Easton ST Axis N-Fused Camo/Axis Trad 600 360 8.0 600 376 8.4
Easton Apollo 610 367 8.2 560 392 8.7
Gold Tip Traditional 600 373 8.3 600 388 8.6

 

So why is this so important and why am I bringing it up here on this blog?

The NFAS has seen a new bow style recently, that of Traditional Bow Hunter. This style allows archers to shoot carbon or aluminium arrows off the bow shelf (no arrow rests). It is seeing a number of traditional archers that shoot flatbow or hunting tackle which uses wooden arrows giving it a go. They are buying carbon arrows of the right spine but I wonder if they are considering the effect of shooting lighter arrows on their bows? I was discussing this with a couple of people including Rob, so we thought we would put this together.

It is worth remembering that a lot of traditional wooden bows have not been constructed to take ultra-light carbon arrows often used in target archery or are sold as cheap alternatives to wooden or aluminium arrrows. Please don’t get me wrong some bows have been constructed to take such arrows but not all.

N.B. Adding a heavier pile to the arrow will increase the overall weight but it will also change the dynamic spine of the arrow, making it more flexible or weaker.

So what can you do?

  • Check the weight of your wooden arrows and carbons so you know the difference.
  • Check what your limb / bow manufactures recommended weights are. Most if not all will have this information on their websites or would be happy to share it with you. After all they don’t want to see you trash your bow as it reflects badly on them.
  • Going for slightly longer arrows as this will increase the mass weight too, this is why we have included two sizes in the above table.

I hope this has proved interesting and helpful. I would like to say thank you to Rob for all his help and number crunching with this. He produced a load of data on different arrows in a long excel document, as well as speaking to several bow manufactures to check minimal weights.

Thanks for reading.

 

Autumnal sunlight through the trees

New bow style – example of people power

I’m typing this up half watching the snow fall in giant flakes outside, and on a skiing holiday and half looking at the screen. It seems holidays are only time I have at present to catch up with my writing.

Anyway onto topic for today. Some of you may remember that a few months back I wrote an article on a proposal that was going forward to the NFAS on an new bow style “Traditional Bow hunter”. I’ve added a link to the article here.

Well the results are in from the members vote, drum roll please … it has been accepted and will become active from the 1st of April from what I understand.
I know the proposers have come under some flack from some other archers for the idea, with comments ranging from “just wanting a new class so they can win medals“, or “why can’t they just shoot under bare bow“. Some of you may have read Grizzly Jims posts on Facebook and Tumblr on the subject.
Whether you area fan of the new style or dislike the idea of another style is not the key point I want to highlight.
I feel that the most important factor is that the society has actively demonstrated democracy in action. It is very easy to have a pop at organisers of a shoot or the society committee, but where the NFAS are concerned they are all, the organisers at local shoots and committee are volunteers, unpaid volunteers.
In this incidence we have seen a group of members, get together with an idea. They followed all the processes of documenting and put it forward as a proposal. The idea was published in the society magazine and at the society’s Annual General meeting people had the opportunity to voice ideas and thoughts, along with on the Facebook group and web-boards. It this was then opened to the society members to vote on it. The members voted and the results in this case a new bow class.
This is democracy in action. The members put it forward, the members voted.
So congratulations to those that took the time to actively participate and thanks to the society organising committee for their efforts.
Oh and if you are curious, I’m not looking at changing to this over American flat bow.
Thanks for reading.