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Thread: Razor Back Option

  1. #11
    dginok's Avatar
    Join Date
    Aug 2009
    Location
    Norman, OK
    Posts
    92

    Default Re: Razor Back Option

    I'm convinced! It shall be installed.

    Thanks all,
    Doug
    Super Sport
    912ULS
    Constant Speed IVOProp


  2. #12

    Join Date
    Feb 2014
    Location
    Three Lakes, Wi
    Posts
    42

    Default Re: Razor Back Option

    I am looking for the instructions for installing the razorback option. It came with the kit I have, but I can't find any reference to it in my build manual. If anyone would be able to share the instructions, I would really appreciate it. It looks like it's pretty simple, but I just want to make sure I don't miss anything.

    Thanks in advance for any help.

    Bob

  3. #13
    Senior Member jmodguy's Avatar
    Join Date
    Jul 2014
    Location
    Carmel, IN
    Posts
    744

    Default Re: Razor Back Option

    I would like to get one of these! I didn't see it in the Kitfox catalog. ANyone have any pricing info??
    Jeff
    KF 5
    340KF

  4. #14
    Senior Member jiott's Avatar
    Join Date
    Jun 2010
    Location
    Portland, OR
    Posts
    2,959

    Default Re: Razor Back Option

    Look at Tom Waid's build website. I believe he made his own razorback. It looked simple and easy. Maybe he will chime in and post a link to the right pages.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  5. #15
    Senior Member jmodguy's Avatar
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    Jul 2014
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    Carmel, IN
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    744

    Default Re: Razor Back Option

    jiott
    Found it. Thanks for the heads up. You're right, looks easy enough...
    Jeff
    KF 5
    340KF

  6. #16

    Join Date
    Mar 2009
    Location
    Titusville, Florida
    Posts
    177

    Default Re: Razor Back Option

    Go Here!


    My SS may be one of the last with this type of razorback.

  7. #17
    Senior Member jmodguy's Avatar
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    Jul 2014
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    Carmel, IN
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    744

    Default Re: Razor Back Option

    Is the razorback an aluminum tube or steel?? Looks to be aluminum...
    Jeff
    KF 5
    340KF

  8. #18

    Join Date
    Mar 2009
    Location
    Titusville, Florida
    Posts
    177

    Default Re: Razor Back Option

    On my SS it's aluminum.

  9. #19
    Senior Member jmodguy's Avatar
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    Jul 2014
    Location
    Carmel, IN
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    744

    Default Re: Razor Back Option

    Anyone have the size of the tubing (dia, wall thickness, and temper)? Maybe some height measurements at some cross tubes?? I want to add this to my KF5
    Regards
    Jeff
    Jeff
    KF 5
    340KF

  10. #20

    Join Date
    Aug 2020
    Location
    Rathdrum ID
    Posts
    41

    Default Re: Razor Back Option

    Quote Originally Posted by jtpitkin06 View Post
    The razorback option applies to the model 7 SS. It is a 3 inch high dorsal fin extension to the vertical stab reaching forward and tapering to zero height at the rear of the baggage compartment.

    According to the supplement in the builder's manual it "does add to the yaw stability of the aircraft."

    The option is made from a 5 foot long piece of aluminum tube and a plywood rib. The parts weigh about 7 ounces. The increase in fabric is negligible.

    This photo shows the razorback tubing and the plywood support. It is bonded in place with Hysol at the rear. The front end of the tube slips over a weldment and is bonded to a fuselage cross member.

    John Pitkin
    Greenville, TX

    Were you able to bend the tube by hand?

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