Pushing the line of diminishing returns...high draw weight versus very low GPP. As that applies to what we do is good reading.

Wow, I cant imagine that bow making very many shots. That high draw weight and a 205 grain arrow is a dry fire. Not taking away from his efforts, its amazing all the same and watching an arrow fly 700 and some odd meters is crazy, out of ANY style bow.

What was the draw weight of the bow? I was unable to locate Pa flight section?

Go to the "Bows" section and up above you will see a sister board named "Flight Bows". I think it was around 80# +/-, 24" arrow.

One reason you don’t see old flight bows for sale. I read were Don Brown of Riverside, Ca. Competed in a welght class then took a bastard file to the bow so he could compete in a lower weight class.

I still don't see where you're looking, I clicked on Lam Bows and Selfbows tabs and don't see anything about flight bows

The bow is storing about 160# of energy. I am not so sure that is at the same 27" draw or not.

Probably not, a link would go a long ways here!

I can't find the "bows" page either. Is it on a different archery site?

http://www.primitivearcher.com/smf/index.php/board,41.0.html

http://www.primitivearcher.com/smf/index.php/topic,57103.0.html? PHPSESSID=87f4rqaasp9j7gt0mh44p3i5j3

Adam Karpowicz - Closing in on the Half Mile « on: May 24, 2016, 04:44:19 pm » I don't know I you have seen this news yet, but Adam Karpowicz has been conducting a number of flight shooting experiments with his horn bows using a shooting machine. Up until now, most of his test shots landed at a distance of 500-600m, but just recently he was able to send an arrow a distance of 790 yards! This is truly amazing, regardless of how the arrow was shot. Adam is quickly approaching the holy grail of flight performance.

The bow he used is 120lb at 27 inches. Arrow is split cane bamboo, 208 grains, and 24.5" long. The string is Dacron, but I imagine a good linen string or even a silk string would improve performance even more.

Here's another interesting fact. The place where Adam runs his tests is several feet below sea level.

Alan

That is quite the accomplishment no matter how it get's sliced, and diced.

Rick

Thanks Jim, I had no idea I was looking all over this site.

Here's the url to the acdtual thread:

http://www.primitivearcher.com/smf/index.php/topic,57103.0.html

The actual weight of the bow shooting 436fps is 175# with 25" of string movement storing 160# of KE. It maintains 60% efficiency shooting an arrow of about 1.25 grains per pound, this is amazing.

That's just mind boggling. How does a bow not blow up shooting that light gpp consecutively? I realize it's a flight bow....but still...amazing!

I haven't participated in the sport, but I think flight archery is very interesting. I'll bet the bowyers that do it learn things about bow design that they can apply to their hunting and target bows.

Uncle Lijiah. Flight shooting is full of surprises. Things we assumed for decades sometimes get shot down. Another aspect of flight shooting is the broadhead division which is my favorite. We are actually shooting hunting weight arrows instead of light flight arrows. We used full size fletches and broadheads etc. I would like to see this area get more attention as it represents the bows we actually use for hunting.

Badger, A trip to the salt flats to actually watch it is on my "bucket list". Clint

Badger, A trip to the salt flats to actually watch it is on my "bucket list". Clint

6/10 of a grain per pound flight arrows. Quite a contrast to hunting weight arrows.

Steve, the broadhead division is 9 grains per pound for 50# bows, but all classes use the same 450 grains regardless of draw weight. I would change that if it were up to me to all weight classes using somewhere between 8 and 10 grains per pound whatever was decided on.

Many years ago there were flight shooting events around the midwest. Some were using full blown Harry Drake style equipment, but the ones that caught my attention were the amateur and broadhead divisions. I expected to see guys drawing way over 30 inches with long skinny arrows that would get them within the weight limits, but was not always the case. I saw the ads how far a Groves could shoot an arrow, but to see one do it live for the first time was impressive. The real flight guys were tossing darts out of sight, to watch a hunting arrow fly over 100 yards further my bow could really got my attention. I bought a takedown black Widow a guy, that was really goofy with forward limbs that could shoot really short arrows, just to play with it. It could really toss a short aluminum target arrow, it was not allowed to shoot one of those darts in the hunting class. I think that is why the guy sold it.

I learn quite a bit as an amateur bow builder by building and shooting Flight bows that can launch very light arrows with high efficiency. The impact of design changes are much easier to measure at 3ggp or less compared to 10ggp.

Durability also becomes very important for Flight bows. Good tuning becomes critical when shooting very light arrows for maximum distance, and this becomes impossible if the bow starts breaking down after just a few shots.

Alan

"Six Tenths" GPP, a little over half a grain per pound, is that really how light that arrow was?

Holy cow that must a rattle a guys teeth to shoot an arrow that light. Steve, do your do your teeth rattle?

The actual arrow weight used for the chronograph tests was verified as weighing 223.3 grains. 223.3/175 = 1.3 ggp.

It is pretty impressive how much energy was transferred to the arrow, so it is still far from the equivalent of a dry fire.

Alan

Sorry about that I reversed the numbers. That must have been an amazing thing to watch.

The 790 meter shot took place about a year ago. The force draw curve for the bow and chronograph readings for the same weight sacrificial arrows were just recently measured.

Alan

Man always wants more, I don't think there's a satisfaction level as man searches for more and more. Can we ever be satisfied with what we have ?

DS

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