Hello Guys,

I really apreciated your advise on the following.

I have a WARP DRIVE Prop on my Rotax 912 100HP (RANS S12-XL)

The WARP DRIVE Prop came with all the harware screws nuts, etc, So I intalled the prop to the 912 with the screws and in the rear the nylocks nuts. I am Including a Pic so you undertand what I mean.

Some people in my clubs says that using nylock nuts is not the correct way to intall the prop to the 912 and they say I need to use Prop Shaft Nuts Part 842-634 or 842-639.

Whats your advise? Can I leave the regular nylocks nuts thats was included with the war drive prop or do I need to replace them for the Prop Shaft Nuts.

Thank you for your time and help,


  • Re: Rotax Prop Shaft Nuts & Warp Drive Prop

    by » 13 years ago

    Hi Isaac,

    That is a very normal way to install a Warp Drive or other props. The torque is 175 in/lbs on those nuts. The bolts have Lord washers and have nyloc nuts. You'll be fine. That is the way all our props are mounted on the entire fleet of Flight Design CT's and many other aircraft. I have a Warp on my FD and this is the way it is installed. The smaller AN bolts for the blades get 120 in/lbs of torque. In all my years I have never had a loose bolt here when it was torqued and installed properly from the beginning.

    Just goes to show that club hearsay is not always current. Some plane Mfg's do use a different setups with safety wired bolts and either way is acceptable.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Isaac F

  • Re: Rotax Prop Shaft Nuts & Warp Drive Prop

    by » 13 years ago


    I've always used nylock nuts on the back of my props with no problems. On my 912 I have nylocks on the back and safety wire in the bolt heads. Not really necessary to do both but I've always been a sucker for overkill.


    Thank you said by: Isaac F

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