[kirkll]

in reply to: EFOC bows #62258

Dr. Ed Ashby wrote: [quote=kirkll]The key to having a high performance bow shoot well is stability. Vertical stability is not as critical as torsional stability, but desirable never the less. Torsional stability in a high performance bow is absolutely critical. This is what keeps those limbs tracking straight.

That’s spot-on. Todays choices in in high performance bows can offer the best of both worlds. That wasn’t the case ‘back when’. I was very impressed with the stability, and the ease with which I could shoot, the ACS-CX I was loaned for use in the testing. Couldn’t fault the stability of that bow at all.

Ed

The ACS-CX is a perfect example of a torsionally stable bow that has questionably poor vertical stability. The radius cross section adds incredible strength to the limb in one direction. but it’s rather limp in the other direction.

A good example would be a common metal tape measure. It has a cup to it and can be extended 8-10′ out before it folds over. But turn it upside down and it wont extend 2 feet.

Limb design has come a long way since the ACS-CX took the lead in high performance bows years ago. There are glass bows available now that meet or exceed the performance levels of the XX carbon ACX and have excellent stability both vertical and torsional…..

[kirkll]

in reply to: Turbulators #61055

Ok…. i’m still getting used to the idea of actually testing out this EFOC thing. I have always been a strong believer in the spin of an arrow having a significant role in the stabilization of arrow flight. But… i was doing my tests with high speed arrows with low FOC at 10-12% at distances of a 100 yards.

Being a relatively open minded person, with a love of adventure, i have decided to play with an EFOC set up and test it out thoroughly against my moderate 15-18% FOC set up.

That being said, would it be safe to say that when using less FOC, more helical and arrow spin plays a bigger part in stabilizing arrow flight VS EFOC philosophy?

[kirkll]

in reply to: Epoxy and glue #60371

I love the hot melt glue, but not all hot melt glue is created equally. i personally use a 3M product that i used professionally with cabinet and countertop installations. This stuff is incredibly strong… The only thing i’ve found wrong with it is when the weather is cold it does become more brittle and going stumping with hot melt glue will result in a lot of lost tips or loose inserts…..

If a guy was going to build stump shooting arrows i’d recommend epoxy…. Good epoxy like the golf shops use, or bow builders smooth on works well too.

another trick to getting inserts out of a shaft that have been epoxied in is putting them in your freezer before using the drill bit method. the stuff gets brittle with cold. Heat doesn’t work so well on high grade epoxy’s. 5 minute epoxy is low grade stuff, but still works ok on arrows.

[kirkll]

in reply to: EFOC bows #60356

Howdy guys! I just registered here & thought i’d jump right into it. For those who don’t know me, my name is Kirk, and i’ve been building composite bows professionally for a few years now. I take great pride in building high performance bows of very high quality.

Some fast bows are hard to control even with a heavy arrow.

I have to agree with this statement, but not the solution Ben Pearson chose. Why shoot an 80# heavy limb long bow when you can get a good shooting R/D with the same performance using the same arrow at 65#’s.

The key to having a high performance bow shoot well is stability. Vertical stability is not as critical as torsional stability, but desirable never the less. Torsional stability in a high performance bow is absolutely critical. This is what keeps those limbs tracking straight.

With a well built bow with excellent stability, you can have the best of both worlds. I typically cut all my shelfs right to center & use a velcro pad to start out unless requested otherwise…. there are competition shooters who do prefer a 3/16″ past center cut, but it would be a waste using EFOC arrows. you’d just have to pad it back out to before center again.

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