A Characterization of Constant-Ratio Curves in Euclidean 3-Space E^3
  A twisted curve in Euclidean 3-space E^3 can be considered as a curve whose position vector can be written as linear combination of its Frenet vectors. In the present study we study the twisted curves of constant ratio in E^3 and characterize such curves in terms of their curvature functions. Further, we obtain some results of T-constant and N-constant type twisted curves in E^3. Finally, we give some examples of equiangular spirals which are constant ratio curves. 
Selin Gurpinar, Kadri Arslan and Gunay Ozturk
math.DG