See also Add BlendCurve
A BlendCurve has, and you can edit, these geometricproperties AT the startPoint and its endPoint
The default geometricproperties of the BlendPoint equal those of the sketchelement with which you merge at its startPoint and/or endPoint. You can edit the geometricproperties:

In the PartEditor or the MechanismEditor:


The two separators in the BlendCurve dialogbox are the: StartPoint parameters EndPoint parameters The parameters in each separator are identical 


Start Point / End Point Parameters Angle (Units: º): Maximum = 360º ; Minimum = –360º Blend checkbox:
Curvature k (Units:1 ∕ meters): Blend checkbox:
CurvatureRate dk ∕ ds (Units: 1 ∕ m^2):
Blend checkbox:
Velocity Scaling Increase VelocityScaling to 'inflate' the BlendCurve. Decrease VelocityScaling to 'deflate' the BlendCurve. Velocity Scaling parameter does not have units. Default Value = 1 ; Maximum Value = 10 ; Minimum 0.01 
To show the DragHandles
DragHandles show at the startPoint and the endPoint. Arrowhead DragHandle can control:
SmallCircle DragHandle can control:
You cannot move DragHandles when they are Green Doubleclick a DragHandle to make it Blue To use the Arrowhead DragHandle
The DragHandle should be come blue 

Rotate the arrowhead around the Point to control the angle of the BlendCurve at the Point. Move the arrowhead further away from the Point to increase the VelocityScaling factor 

To use the SmallCircle DragHandle
Move the smallcircle clockwise from 90º (vertically up) towards 270º (vertically down), the Curvature increases from 0 (a straightline) to +ve Large Value Move the smallcircle counterclockwise from 90º towards 270º, the Curvature increases from 0 to –ve Large Value 
Curvature Points along a curve have a radius. We call it the curve's RadiusofCurvature. In general, the RadiusofCurvature continually changes as it moves along the curve. Curvature = 1/RadiusofCurvature Thus, RadiusofCurvature decreases, the Curvature increases. Curvature of a Line = 0 Curvature of a Circle = 1 ∕ Circle Radius. E.g. : A circle has a radius of 20mm, its curvature = 1/0.02m = 50/m. CurvatureRate i This is the rateofchange of curvature (how rapidly curvature changes) with respect to the distance along the BlendCurve. 