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Thread: Kitfox IV modifications

  1. #1

    Join Date
    Mar 2019
    Location
    Morris, IL
    Posts
    72

    Default Kitfox IV modifications

    I may be able to get a Kitfox IV project close by where I live. It is uncovered and I wanted to get a list of modifications that you guys that have been flying Kitfoxes and Avids for a while have made and feel are worthwhile. I'm interested in hearing about all modifications, but especially those that are considered mandatory and need to be done before covering. Don't think that any mod is too trivial or simple because I want to try to think of all and incorporate the ones I want during the build rather than try to add on later. I'll start the list below. If you would when you post let me know if you think a particular mod is mandatory, nice to have, etc. Just so you know some of the parameters, the airplane will be a tailwheel airplane powered by an 80 hp Rotax 912. I'm going for light weight as much as possible.


    Modifications List


    1. Comply with all Kitfox service bulletins and service letters


    2. Reinforce fuselage sides where landing gear mounts


    3. Reinforce landing gear truss where bungees attach


    4. Different main landing gear (Grove, cabane type, other) (I'll probably go with cabane type gear)


    5. Larger pneumatic tailwheel (Probably a 8" Matco)


    6. In flight adjustable elevator trim tab. (Electric or manual)
    John Brannen
    Morris, IL
    Kitfox IV 1050 - Rotax 582

  2. #2
    Senior Member Dusty's Avatar
    Join Date
    Dec 2012
    Location
    Christchurch, New Zealand
    Posts
    304

    Default Re: Kitfox IV modifications

    The Murl williams wide body kit would be a good starter as the 4 is a bit cozy. Also remount the top harness position directly on your centreline as the single mount in the middle lets the inner strap slide off and the outer chafes. Unfortunatly even small modifications add up in weight. However a heavy (730 ib)4 with 80 hp still performs extremely well.

  3. #3
    Senior Member
    Join Date
    Mar 2009
    Location
    Pittsboro,NC
    Posts
    260

    Default Re: Kitfox IV modifications

    If you plan on mounting your comm antenna on the plate behind the turtle deck, it would be a good time before covering to figure out some kind of ground plane. Also my model 4 has a 2nd plate a couple of feet back toward the tail that would be perfect for your ELT antenna except that it's about impossible to install after the fabric is on. I ended up putting my ELT antenna on the inside. And be sure to put an inspection cover beside the tailwheel leaf spring bolt. I had a leaf spring break while flying a friends model 2 (a single leaf). It was easy to replace with inspection cover. Would have been a bear in the field without. I'm sure I'll think of something I wish I had done.

  4. #4

    Join Date
    Mar 2019
    Location
    Morris, IL
    Posts
    72

    Default Re: Kitfox IV modifications

    Thanks. Good suggestions. Here is the current list. Again, likely won't do all of these, but will consider any suggestions.

    1. Comply with all Kitfox service bulletins and service letters
    2. Reinforce fuselage sides where landing gear mounts
    3. Reinforce landing gear truss where bungees attach
    4. Different main landing gear (Grove, cabane type, other) (I'll probably go with cabane type gear)
    5. Larger pneumatic tailwheel (Probably a 8" Matco)
    6. In flight adjustable elevator trim tab. (Electric or manual)
    7. Beef up tailspring mount area.
    8. Inspection ring near tailwheel spiring bolts
    9. Ground plane for antenna mount
    10. Widen fuselage at seat back (Murle Williams kit or other)
    11. Relocate shoulder harness mount so that straps don't fall off shoulders.
    John Brannen
    Morris, IL
    Kitfox IV 1050 - Rotax 582

  5. #5
    Senior Member
    Join Date
    Jan 2011
    Location
    LAWRENCE, KS
    Posts
    471

    Default Re: Kitfox IV modifications

    To that list, I would like to add:

    A Center Floor console to route your wires through, and add position adjustment notches on the flap lever
    Find a place to mount a fire extinguisher, this probably means welding in a plate somewhere
    Replace wood floor boards with metal
    Add cargo bag, and possible add second cargo area behind bag for light weight things, such as pillows, sleeping bag
    Add close outs between the floor board and seat pan to keep stuff from rolling under the seat and jamming the controls
    Add weldment to attach rudder trim tab - hand bending type.
    Make sure you use the metal header tank with low level sensor
    consider boost electric pump on the header tank outlet, and make sure you can drain the tank.
    Leave empty space on your instrument panel for tablets or other devices used in navigation
    Use hand held communication radio to save big bucks over installation and maintenance/certification of panel mounted units
    Add blocks to bottom of seat pan in case the straps break, so you don't jam the controls under the seat

    Hope this helps
    Roger






  6. #6
    Super Moderator Av8r3400's Avatar
    Join Date
    Jan 2009
    Location
    Merrill, WI
    Posts
    2,807

    Default Re: Kitfox IV modifications

    Yup. You guys are looking for The Mangy Fox... I have every one of those mods except the "widening" kit. With the bubble doors, it really does nothing for space in the cabin.

    IMG_4541.jpg
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
    YouTube Videos

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