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Thread: 109 Flettner Tab | Forums

  1. #1
    XyZspineZyX
    Guest
    Hey All
    1 Question for all you 109 fans. Late war 109's had Flettner tabs on the Rudder and i've even read somewhere that they were installed also on the ailerons. My question is: What is the effect of a flettner tab? Does it work like a trim tab or is it something different?

    <S>!
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  2. #2
    XyZspineZyX
    Guest
    Hey All
    1 Question for all you 109 fans. Late war 109's had Flettner tabs on the Rudder and i've even read somewhere that they were installed also on the ailerons. My question is: What is the effect of a flettner tab? Does it work like a trim tab or is it something different?

    <S>!
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  3. #3
    XyZspineZyX
    Guest
    Similar to trim, but it is directly linked to the control. The more a rudder is deflected, the higher the control forces. Purpose of a flettner tab is to lessen these forces. Flettner tabs were used on 109K variants and IIRC also on some late G variants to counter the problem of high control forces at high speed which lessened the 109's maneuverability.
    It is a little flap at the end of the rudder that deflects in the opposite direction of the rudder, thus locally creating a little downward lift opposite to the control force. Since the flettner tab is located at the trailing edge of the rudder, this little downward force creates a noticeable torque as compared to the torque from the control force itself. The IL2's ailerons are flettner tab supported, you can see this in the game.
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  4. #4
    XyZspineZyX
    Guest
    Yes, It's a BALANCE tab
    SM



    Message Edited on 07/08/0311:45AM by schwarz-man
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  5. #5
    XyZspineZyX
    Guest
    Thx JG5_JaRa!
    That would mean that at high speeds control forces on the late 109's would be much more manageable then early war like Emil or Franz.
    Were there any 109's equipped with flettner tabs on the ailerons?
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  6. #6
    XyZspineZyX
    Guest
    A Flettner tab on the side rudder was default for all K4s but I'm not sure about aileron tabs. Many pictures show K4s without such tabs on the aileron, but on some there are controllable tabs which are either aileron trim tabs or flettner rudders.
    By the way, in my explanation above, the case "tabs create a downward force" refers to rudder up - for rudder down, the tabs then create an upwards force. I hope this was obvious.
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  7. #7
    XyZspineZyX
    Guest
    S!

    Discussions with WW2 veterans of Finnish Air Force revealed that some G-6 later models with the taller wooden tail had rudder trim, some had the Flettner tab.

    One of our 109-fans and researchers has stated after his research that many Bf109K's had Flettner tabs in the ailerons to help rolling at higher speeds...



    Flanker
    Training/Tactics Officer
    Lentolaivue 34
    http://www.virtualpilots.fi/LLv34

    "Let Chaos entwine on defensless soil"
    -Dimmu Borgir-
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  8. #8
    XyZspineZyX
    Guest
    [img] <A HREF=[/img]http://109lair.hobbyvista.com</A>/techref/structures/tails/770269.jpg">


    from http://109lair.hobbyvista.com

    a 109 tail with the Flettner tab.

    JG53 PikAs Abbuzze
    I./Gruppe

    http://www.jg53-pikas.de/
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