Help with sail cloth

We have no experience with pipe builds but are desperate to build a sail cloth for our outside porch. Our question is how to know how far to separate support bars the long way for a 9' x 18' canopy? We plan to learn pipe bending for the outer corners. The cloth canopy will be Sun Screen fabric I've had for 8 years & couldn't use till we found Maker Pipe. Is 36" separation to big?

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