The Documents are viewable only with Adobe Acrobat Reader. If you do not have it on your computer, you will be given an opportunity to download it for free.
Here are a couple of hints on getting the Rotax data you want. 
  • Click on the link below. It will take you to the Document Retrieval area of the Rotax Owners Club web site where you may enter as a guest, or register as a "new user".  If you have the time, it is highly recommend that you register. Don't worry about this being a trick to get your email address. If you register, in the future, you will automatically get email notification when new Rotax Service documents are available. 
  • If you don't have the time to register now, just click the link below and login as a Guest.  
  • You will be given a search option. 
  • In this case, you are looking for SI-11-1991. Propeller Mass Moment of Inertia.
  • When the search window appears, click on the "Key Word Search" button. 
  • Then, simply key in the word "inertia"
  • Click on the "Search" button.      The result will currently find only two documents. 
  • Click on the one you wish to view.  SI-11-1991 Propeller Mass Moment of Inertia
  • You will only have to log in, as guest or registered user, once per session.
 Document Retrieval Guest Entrance

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