"Mystery" parachute drag coefficient/suitable rocket weights?

[Raketenolli]

I bought a rocket along with a parachute a few years back from somebody who gave up the hobby and I'm currently sorting through all my recovery hardware, making sure I have enough stainless steel swivels, quicklinks and such, but I don't really know anything about this parachute except that it's blue and white, has a non-regular octagonal shape and a "diameter" (measured across the white part) of 43 inches.

Is anybody familiar with this design ("pillow" parachute?) and knows the drag coefficient so that I can calculate suitable rocket weights, or knows those weights directly for that size?

Thanks!
Oliver

 

[jsdemar]

It's an X-form parachute. Try this:
https://archive.rocketreviews.com/tool_descent_rate.shtml

 

[Raketenolli]

Definitely not an X-form parachute, the corners that would be "empty" on an X-form are filled in with the blue triangles in this case. Probably behaves similar to a flat hex or octagon parachute, but unsure, that's why I'm asking here.

Oliver