the blend just below is done in creo parametric 2.0 and the one below that is in pro/engineer wildfire 4.0...exactly with the same option , but very different feature? how? and ellipse and a circle has been used...
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I just made one similar to your. And yes, by default, if the ellipse is "vertical" in the second section, it creates a twist. When I divided the circle, now the sides are "straight" (no depression). You can use the "divide" command in the sketch of the circle to help control the start points for the blend.
