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Fuel tank vents

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mc06854

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Location
Portland, tx
Plumbing my fuel tank vents on my SDII. Running inverted vent up Cabane and making a bend into the slipstream. One article I have says it should be at a 30 to 45 degrees angle into the slipstream.
Does this mean a 30 to 45 degree bend angle up in level flight?
Also, does the end of tube need to be a straight cut or cut 45 degrees.
Mike
 

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