Array with Incrementaly Shorter Length?

[Rocket]

I am building a Right Side Triangular Louver and want to add vanes depending on the height which I know you can do with an array tied to a count formula. But I want the vanes to get shorter as they are added so they match the angle of the triangle slope. This slope changes depending on the length. I can get this to work with individual vanes but that way doesn't add/subtract new vanes as the height changes. Is this even possible in the family building environment so that it is parametric?

Any suggestions or help would be greatly appreciated!
Thanks,
Nathan