My friend has a very large 4 blade wood prop made by Rolls Royce. Its almost 8ft from one tip to the other, it is stamped 1912 RH pusher prop his grandpa said it is off of a large blimp maybe a zeppelin. I have looked online and came up with a WW1 bye plane called a DH 4 and it used a large 4 blade Rolls Royce prop. Any body know anything about a old prop like that ? any info would be great thanks. I do not have any pics.