EFOC - What does EFOC stand for? The Free Dictionary
References in periodicals archive
VAP arrows accept either an aircraft-grade Aluminum Penetrator II Adapter (5/16 diameter, 43 grains) or Stainless Steel Penetrator Adapters (9/32, 93 grains) for an even more EFOC
configuration, and all Penetrator Adapters accept standard 8/32 broadheads.
On average, the 54-pound bow's EFOC arrows out-penetrated the 82-pounder's standard arrows by 48.
Broadhead Mechanical Advantage (MA) has a more pronounced influence on the penetration of a perfectly flying, structurally sound arrow than any other factor except EFOC.