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  • Spoilers that don't suck open

    From Eric Greenwell@21:1/5 to All on Sun May 1 09:36:15 2022
    The ASW27 and later Schleicher gliders have spoilers that won't suck open in flight when
    they are unlocked, because the trailing edge of the spoiler caps is higher than the
    leading edge (front edge flush with wing, rear edge not flush). Is this a common feature
    on other gliders? Is it a regulatory requirement?

    Eric
    --
    Eric Greenwell - USA
    - "A Guide to Self-launching Sailplane Operation"
    https://sites.google.com/site/motorgliders/publications

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  • From Dan Marotta@21:1/5 to Eric Greenwell on Sun May 1 14:57:55 2022
    They suck open in the Stemme and they're flush with the wing when
    unlocked. Probably that pesky low pressure on the top surface of the
    wing that we love so much!

    Dan
    5J

    On 5/1/22 10:36, Eric Greenwell wrote:
    The ASW27 and later Schleicher gliders have spoilers that won't suck
    open in flight when they are unlocked, because the trailing edge of the spoiler caps is higher than the leading edge (front edge flush with
    wing, rear edge not flush). Is this a common feature on other gliders?
    Is it a regulatory requirement?

    Eric

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Raul Boerner@21:1/5 to Eric Greenwell on Sun May 1 18:52:50 2022
    On Sunday, May 1, 2022 at 10:36:19 AM UTC-6, Eric Greenwell wrote:
    The ASW27 and later Schleicher gliders have spoilers that won't suck open in flight when
    they are unlocked, because the trailing edge of the spoiler caps is higher than the
    leading edge (front edge flush with wing, rear edge not flush). Is this a common feature
    on other gliders? Is it a regulatory requirement?

    Eric
    --
    Eric Greenwell - USA
    - "A Guide to Self-launching Sailplane Operation" https://sites.google.com/site/motorgliders/publications

    Eric,

    The LS6 manual states that at high speeds, unless the flaps are in "-5" degrees, when unlocked, the air brakes will tend to suck open.

    Raul Boerner

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  • From Ian Molesworth@21:1/5 to All on Mon May 2 02:08:46 2022
    This is behind the new positive engagement lock being fitted to new ships. You unlock the brakes and then need to move the lever past a gate to open them. A good idea especially if there is even an outside chance of someone opening them above maneuvering
    speed and having them suck fully open and imposing some big loads on the airframe or having a launch with brakes unlocked. An added advantage is the ability to engage in one or more gates and have hands-free operation for a few seconds.

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