headroom
headset
head-space
headspace
headstock
heads-up
head-to-base
head-to-head
head-to-oxide
head-to-tail
  head-to-tape
headtree
head-up
headwall
headwater
headway
head-wheel
headwheel
headwind
headwork
head-wrap

    head-to-tape spacing loss

    контактные потери