The best replacement for helical is offset.

The best alternatives to helical are rated as following:
★★★★★  offset
★★★★  spiral ct
★★★  straight fletching
★★★  offset fletching
★★★  straight cut gears
★★  straight fletch
★★  offset vanes
★★  left helical
★★  straight vanes
★★  spur gears
★★  straight
★  spiral
★  axial ct
★  metal plate
★  torsen
★  spur gear
★  axial
★  crosshair
★  viscous
  spur
  right helical
  polyhedral
  right helical fletching
  worm gear
  patch antenna
  icosahedral
  vlsd

Your alternative for helical is not listed? Suggest!
Speaking about helical, one probably shouldn't forget about whisker biscuit.

Other search terms related to helical and their ratings are:
★★★★★ whisker biscuit
★★ blazer vanes
★ blazer vane
You have in mind a companion for helical and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of helical in all years. Click on graph for more.
helical
offset
spiral ct