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Re: Array with Incrementaly Shorter Length?
You can't do it with a simple array.
Create an adaptive component with a nested (2 or 4 point*) adaptive family for the vane. (*depends how much control do you want)
In the host family, create a surface for the triangle, divide surface, apply parameter for number of subdivisions. (show nodes on the surface)
Load the adaptive vane family, apply the 2 (or 4) points on one section of the subdivided surface. Apply repeater modifier.
I've attached a sample how it could work for you. You'll need to play with the vane family if you want to have 4 adaptive points or control to the size, rotation etc...