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Thread: Full Flap Use

  1. #41

    Join Date
    Mar 2019
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    Bonita Springs, FL
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    Default Re: Full Flap Use

    Lots of good discussion on this thread about flaperon use. What I am wondering is what would be Vfe for a Kitfox 4 1200 ? Obviously no lower end other than stall speed, but is there a published number for max flap extended speed ? I have not found anything. My aircraft is undergoing the Airworthiness Inspection, and the DAR is pretty adamant about having all the gauges marked with operating ranges, including the white ring for flap speeds such as seen in a 172.
    Scot Trueblood
    Bonita Springs, FL

    Building a Kitfox IV

  2. #42
    Administrator DesertFox4's Avatar
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    Aug 2008
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    Default Re: Full Flap Use

    Scot, my model 4 Classic was 80 mph.


    DesertFox4
    Admin.
    7 Super Sport
    912 ULS Tri-gear


  3. #43
    Senior Member jiott's Avatar
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    Default Re: Full Flap Use

    Its also 80 mph for the SS7. This is for full flap extension. I have never seen a speed limit for 1/2 flaps; has anyone else seen anything for 1/2 flaps? I nearly always wait for 80 mph before pulling any flaps at all because its a good habit, but I have never been concerned if I happen to pull 1/2 flaps at 85-90 mph.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  4. #44
    Senior Member jrevens's Avatar
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    Default Re: Full Flap Use

    Quote Originally Posted by jiott View Post
    Its also 80 mph for the SS7. This is for full flap extension. I have never seen a speed limit for 1/2 flaps; has anyone else seen anything for 1/2 flaps? I nearly always wait for 80 mph before pulling any flaps at all because its a good habit, but I have never been concerned if I happen to pull 1/2 flaps at 85-90 mph.
    Same here, Jim. I use 1/2 flaps for take-off & landing, as recommended by Paul at Stick & Rudder. I've tried every which way of course, but prefer that. When first starting to fly my Kitfox, I'd occasionally forget to retract them and have gone right through 90 mph before realizing it. Paul commented to me that the newer style flap mounting bracket design was stronger than the original design, although I've never personally confirmed that.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE

  5. #45
    Super Moderator Av8r3400's Avatar
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    Default Re: Full Flap Use

    I have the flaps on my plane (Classic IV-1200) set up with a 3-position gate. 1st notch is ~8, 2nd is ~12 and 3rd is full throw of 24.

    Since the "flaps" are also the ailerons, my first notch of flaps is usable at 100 mph. 2nd notch at 80. 3rd notch at 60. That's my method...
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
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