Assertion: boomerang's surface | /r/HasProperty | flat
Facets:
value: normally
type: DEGREE
Source sentences:
text: Normally, these surfaces are flat or slightly convex.
text: Normally, these surfaces are flat or slightly convex.
text: If there is any warp in the wood, make sure that this produces dihedral on the upper side of the boomerang, i.e., if the airfoil is uppermost and the boomerang is on a flat surface, then the wingtips are raised slightly above the surface.