I used Stella 4d to make this polyhedron. You can try this program for yourself, for free, at http://www.software3d.com/Stella.php.
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RobertLovesPi.net 
Hi Robert,
Is the trapezium (or trapezoid) the same one that was used for the penta-belt I sent you some years ago? I have made many models with these – the small equilateral triangle comes in handy too.
The thing is, if it’s the same polyhedron as this…
https://hedraweb.wordpress.com/2016/05/09/equatorial-proppelor-model/ then mine is a fake!
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I don’t know! I wish I’d saved the .stel file from this, so we could investigate this further, but I did not.
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