Thanks for the post. It is my DAD (not granddad) in the picture.
I am named after him. Leonard G. Woodruff, Jr.
Years ago the pilot in the picture owned a B-17 that he flew to Dallas and my dad (and others) were able to take a flight around the area on it. He was ecstatic after the flight and talked about it for years afterwords.
I recently purchased the 1/48 Revell/Monogram B-17G since it looked like it had the most after market parts available. However I hear someone is doing a 1/32 scale version of the plan.