I have to model various extruded aluminum streamline tubes. Is the an airfoil number for these? So far all I can find is simple cross-sections with major, minor and wall thickness.
The shapes are definitely not oval and are tear drop. The tubes I'm looking at are COTS for light sport aircraft form aircraft supply companies and not from the extrude/shaper. I was hopeing there was a standard shape or spec for them. However this may not be the case.
The MS33534 spec should have all the proportions and relationships you need - but the COTS statement makes me wonder if the extruder may have taken liberties (not followed this spec). Also the MS is for taking round 4130 and mashing it into a streamline or oval. Not so constrained dimensionally with extrusion.
Been dealing with the same issue myself, except with GM versus Toyota roof racks - soon to purchase the third set of adapters for the kayak racks.
A "half round oval" is a teardrop shape. it is half round on one side and an oval or ellipse shape on the other.
Illustration of streamline tubing from Wag-aero
For aerodymanic drag eval: check out Hoerner's "Fluid Dynamic Drag". There is a section on streamlined bodies including bodies similar-to streamline and oval tubing sections.
Regards, Wil Taylor
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