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tech / rec.aviation.soaring / Re: Spoilers that don't suck open

SubjectAuthor
* Spoilers that don't suck openEric Greenwell
+- Re: Spoilers that don't suck openDan Marotta
`* Re: Spoilers that don't suck openRaul Boerner
 `- Re: Spoilers that don't suck openIan Molesworth

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Spoilers that don't suck open

<t4mcu0$1pl$1@gioia.aioe.org>

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From: own...@thegreenwells.netto (Eric Greenwell)
Newsgroups: rec.aviation.soaring
Subject: Spoilers that don't suck open
Date: Sun, 1 May 2022 09:36:15 -0700
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 by: Eric Greenwell - Sun, 1 May 2022 16:36 UTC

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

Re: Spoilers that don't suck open

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From: dcmaro...@earthlink.net (Dan Marotta)
Newsgroups: rec.aviation.soaring
Subject: Re: Spoilers that don't suck open
Date: Sun, 1 May 2022 14:57:55 -0600
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 by: Dan Marotta - Sun, 1 May 2022 20:57 UTC

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

Re: Spoilers that don't suck open

<f6205bad-e5c8-4649-9218-28ef766514c3n@googlegroups.com>

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Subject: Re: Spoilers that don't suck open
From: n98...@gmail.com (Raul Boerner)
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 by: Raul Boerner - Mon, 2 May 2022 01:52 UTC

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

Re: Spoilers that don't suck open

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Subject: Re: Spoilers that don't suck open
From: imoleswo...@gmail.com (Ian Molesworth)
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 by: Ian Molesworth - Mon, 2 May 2022 09:08 UTC

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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