Extreme front of center (EFOC) arrows aren’t a new concept. They’ve been talked about in traditional archery forums extensively for the past 10 years or so. But understanding what’s happening and why higher FOC influences and arrows flight and penetrating ability can be a little confusing to folks, especially those new to archery.
In this video I explain what FOC is, why it’s important, and how to measure it. Once you have two measurements, the formula to determine FOC is simple. You’ll need a total arrow length, from the throat of the nock to the base of the tip, as well as a measurement from the nock throat to the balance point. Plug that into the following equation and voila – %FOC!
((Balance Point/Arrow Length)- 0.5)x100=%FOC
All of this comes directly from Dr. Ed Ashby’s research into arrow lethality and penetration. There is a great discussion board dedicated to the topic at www.tradbow.com so be sure to check that out. You’ll find tons of great info on EFOC arrows there.
In future videos we’ll be building EFOC arrows in both carbon and natural material shafts so make sure you’re subscribed to the YouTube channel and signed up for the mailing list to get notified.