Here are a couple of pictures of a very large Variprop 4-blade propeller.

This Variprop propeller was made at SPW facility in Bremerhaven. It is 62 inches in diameter, it has 4-blades and weighs in at just on 1000lbs.

It has been installed on an old sailing vessel, Oosterschelde. Here is a link to further details and photographs on the vessel http://www.oosterschelde.nl/de/