Please note that the PICTURE UPLOAD function is not working. The iBoats Forum Moderators are working with the system administration folks at the parent company to get the issue resolved. This happened about a year ago and here we are again. In the meantime you can post photos as links to a picture hosting site of your choice. We are sorry about the inconvenience and will advise when the issue is resolved. Thank you for your patience.
Mine didn't have a clear marking either so I looked them up on the net and called their phone number. If you get the number off the hub of the prop they can tell you what it is. Mine happened to be a 17 and the part number ended in 17 so you may be able to draw a conclusion from that.
