The height relative to the 8ft length will be in the same proportion as the area of the 'filled' portion of the cross-sectional (circle) area while horizontal.



The part that is filled is a segment of the circle, plus two right triangles that fill in the 'wedge'









So the height when the cylinder is vertical is:



   



Sorry for the scattered format, all the information is there...  There may be more optimal ways to compute the answer.   

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