Blackbird with a 10x10 tarp?

[wyattd5]

Does anyone think I could get good coverage from a 10x10 tarp on a WB Blackbird? I'm using a Claytor diamond right now but I was going to explore the rectangle set up. The BB is supposedly right at 10 feet long but the ridge line is 101"......so doesn't that mean that the part that needs to be covered is only around 8.5 feet because of the sag? I've never tried a rectangle set up and my diamond fly is not cut right to set it up that way.

[KMACK]

I used a 8 X 10 w/a WBBB w/out issue. Never saw heavy rain but never gave it any concern. You should be good.