Assertion: boomerang | /r/HasAspect | pit
Facets:
value: on the top surface
type: LOCATION
Source sentences:
text: Some boomerangs have turbulators — bumps or pits on the top surface that act to increase the lift as boundary layer transition activators (to keep attached turbulent flow instead of laminar separation).
text: Some boomerangs have turbulators—bumps or pits on the top surface that act to increase the lift as boundary layer transition activators (to keep attached turbulent flow instead of laminar separation).