RASaero trapezoidal fins

Atlasboy · Jan 5, 2013

I'm not sure which airfoil type to set for these given the available choices. The cross section of the fins looks pretty much square for the fin can (other than the area where I did the filets). So I'm thinking square, but I'm really not sure. In OpenRocket it says "airfoil" for cross section. I have the 54mm version seen here https://www.giantleaprocketry.com/docs/acmefincans.pdf

CarVac · Jan 5, 2013

By section it means the cross section when sliced. It assumes that the fin profile when viewed from the side is trapezoidal.

Unless your finds are actually trapezoidal cross-section? Do they have flat front and rear faces of different widths?

bobkrech · Jan 5, 2013

CarVac said:
By section it means the cross section when sliced. It assumes that the fin profile when viewed from the side is trapezoidal.

Unless your finds are actually trapezoidal cross-section? Do they have flat front and rear faces of different widths?

Goto https://www.rasaero.com/dl_manual.htm and download the instructions. Fin input detail is on pages 15-18.

RASaero trapezoidal fins

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RASaero trapezoidal fins

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Atlasboy

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