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Hole opening in fuel tank for aluminum flange?

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Jerry

Radial Skybolt Builder: 220.45% completed
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Using an AN867-2 aluminum flange for the fuel outlet on the main fuel tank.

Overall size of flange is 1 3/4" with the hole opening 1/2".

Question: How large do I make the opening in the aluinum tank? 3/4"?

thanks
Jerry
 

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