Domain jim.bttr-software.de
Germany
23M GmbH
Software information

openresty openresty

tcp/443 tcp/80

  • Open service 2a00:f48:2000:affe:fe00::20:443 · jim.bttr-software.de

    2026-01-12 17:21 

    HTTP/1.1 200 OK
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Date: Mon, 12 Jan 2026 17:21:43 GMT
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Page title: The Deturbulator Project

<!DOCTYPE html>
<html lang="en">
<head>
<title>The Deturbulator Project</title>
<meta charset="utf-8" />
<meta name="description" content="This project was an effort to improve aircraft performance by testing a novel technique for boundary flow control on a Standard Cirrus glider with a…" />
<meta name="author" content="Jim Hendrix" />
<meta name="generator" content="Datenstrom Yellow" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" type="text/css" media="all" href="/assets/stockholm.css" />
<link rel="icon" type="image/png" href="/assets/stockholm.png" />
</head>
<body>
<div class="page layout-default">
<div class="header" role="banner">
<div class="sitename">
<h1><a href="/"><i class="sitename-logo"></i>The Deturbulator Project</a></h1>
</div>
<div class="sitename-banner"></div>
<div class="navigation" role="navigation" aria-label="Main">
<ul>
<li><a class="active" aria-current="page" href="/">Home</a></li>
<li><a href="/summary/">Summary</a></li>
<li><a href="/articles/">Articles</a></li>
<li><a href="/archive/">Archive</a></li>
<li><a href="/files/">Files</a></li>
<li><a href="/participants/">Participants</a></li>
<li><a href="/groups/">Groups</a></li>
<li><a href="/contact/">Contact</a></li>
</ul>
</div>
<div class="navigation-banner"></div>
</div>
<div class="content">
<div class="main" role="main">
<h1>Overview</h1>
<p><a href="/media/downloads/DeturbulationNutshell.pdf"><img src="/media/images/deturbulationnutshell-200w.jpg" width="200" height="137" alt="Deturbation In a Nutshell" title="Deturbation In a Nutshell" class="right" /></a>
This project was an effort to improve aircraft performance by testing a novel technique for boundary flow control on a Standard Cirrus glider with a Wortmann airfoil. Progress has been slow because the work was done with private funding and equipment. This work began in 2003 as a cooperative effort by Dr. Sumon Sinha and <a href="/jim">Jim Hendrix</a>. However, it split into separate efforts when it became clear that the objectives of the participants were not compatible.</p>

<p>Until March 2011, it could only be said that we had demonstrated the viability of a new method of boundary flow control on Wortmann wings. Now, it appears that there is a simple, cheap and practical <a href="/Progress-03192011-15Cheap">modification</a> that offers up to 15% improvement. Applicability to modern airfoils remains to be tested.</p>

<p><a href="/johnson"><img src="/media/images/johnson-120w.jpg" width="120" height="108" alt="Deturbation In a Nutshell" title="Deturbation In a Nutshell" class="left" /></a>
In December 2006, my glider was taken to the legendary <a href="/johnson">Richard H. (Dick) Johnson</a> for independent testing. Johnson confirmed average improvements of <strong>13% to 18%</strong> at 50 knots indicated airspeed. He measured sink rates manually using his time honored methods. Johnson summarized his <a href="/media/downloads/Johnson-Report.pdf">report</a>, with the conclusion that "<strong><em>the new Sinha Deturbulator could be the first really significant drag-reducing aerodynamic invention since the development of the now-common laminar-flow airfoils that were developed some 65 years ago.</em></strong>"</p>

<p>A properly sized rear-facing step near the leading edge of a precision, composite wing can produce significant performance improvements. This method (1) reduces form drag by keeping the laminar detached boundary flow close to the surface (reduces effective wing thickness), (2) reduces surface area exposed to laminar skin friction over the front of the wing and (3) reattaches the flow gently, at a grazing angle, for less energetic attached turbulent flow over the aft section of the wing. On the top surface, this requires a delicate balance of conditions that is extremely effective at a precise airspeed. This balance can be maintained manually for about 1.5 minutes by holding the airspeed constant. Beyond that, a custom designed, pitch autopilot fed with boundary flow sensors might hold it indefinitely. This extreme per
    Found 2026-01-12 by HttpPlugin
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  • Open service 2a00:f48:2000:affe:fe00::10:443 · jim.bttr-software.de

    2026-01-12 17:21 

    HTTP/1.1 200 OK
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Page title: The Deturbulator Project

<!DOCTYPE html>
<html lang="en">
<head>
<title>The Deturbulator Project</title>
<meta charset="utf-8" />
<meta name="description" content="This project was an effort to improve aircraft performance by testing a novel technique for boundary flow control on a Standard Cirrus glider with a…" />
<meta name="author" content="Jim Hendrix" />
<meta name="generator" content="Datenstrom Yellow" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" type="text/css" media="all" href="/assets/stockholm.css" />
<link rel="icon" type="image/png" href="/assets/stockholm.png" />
</head>
<body>
<div class="page layout-default">
<div class="header" role="banner">
<div class="sitename">
<h1><a href="/"><i class="sitename-logo"></i>The Deturbulator Project</a></h1>
</div>
<div class="sitename-banner"></div>
<div class="navigation" role="navigation" aria-label="Main">
<ul>
<li><a class="active" aria-current="page" href="/">Home</a></li>
<li><a href="/summary/">Summary</a></li>
<li><a href="/articles/">Articles</a></li>
<li><a href="/archive/">Archive</a></li>
<li><a href="/files/">Files</a></li>
<li><a href="/participants/">Participants</a></li>
<li><a href="/groups/">Groups</a></li>
<li><a href="/contact/">Contact</a></li>
</ul>
</div>
<div class="navigation-banner"></div>
</div>
<div class="content">
<div class="main" role="main">
<h1>Overview</h1>
<p><a href="/media/downloads/DeturbulationNutshell.pdf"><img src="/media/images/deturbulationnutshell-200w.jpg" width="200" height="137" alt="Deturbation In a Nutshell" title="Deturbation In a Nutshell" class="right" /></a>
This project was an effort to improve aircraft performance by testing a novel technique for boundary flow control on a Standard Cirrus glider with a Wortmann airfoil. Progress has been slow because the work was done with private funding and equipment. This work began in 2003 as a cooperative effort by Dr. Sumon Sinha and <a href="/jim">Jim Hendrix</a>. However, it split into separate efforts when it became clear that the objectives of the participants were not compatible.</p>

<p>Until March 2011, it could only be said that we had demonstrated the viability of a new method of boundary flow control on Wortmann wings. Now, it appears that there is a simple, cheap and practical <a href="/Progress-03192011-15Cheap">modification</a> that offers up to 15% improvement. Applicability to modern airfoils remains to be tested.</p>

<p><a href="/johnson"><img src="/media/images/johnson-120w.jpg" width="120" height="108" alt="Deturbation In a Nutshell" title="Deturbation In a Nutshell" class="left" /></a>
In December 2006, my glider was taken to the legendary <a href="/johnson">Richard H. (Dick) Johnson</a> for independent testing. Johnson confirmed average improvements of <strong>13% to 18%</strong> at 50 knots indicated airspeed. He measured sink rates manually using his time honored methods. Johnson summarized his <a href="/media/downloads/Johnson-Report.pdf">report</a>, with the conclusion that "<strong><em>the new Sinha Deturbulator could be the first really significant drag-reducing aerodynamic invention since the development of the now-common laminar-flow airfoils that were developed some 65 years ago.</em></strong>"</p>

<p>A properly sized rear-facing step near the leading edge of a precision, composite wing can produce significant performance improvements. This method (1) reduces form drag by keeping the laminar detached boundary flow close to the surface (reduces effective wing thickness), (2) reduces surface area exposed to laminar skin friction over the front of the wing and (3) reattaches the flow gently, at a grazing angle, for less energetic attached turbulent flow over the aft section of the wing. On the top surface, this requires a delicate balance of conditions that is extremely effective at a precise airspeed. This balance can be maintained manually for about 1.5 minutes by holding the airspeed constant. Beyond that, a custom designed, pitch autopilot fed with boundary flow sensors might hold it indefinitely. This extreme per
    Found 2026-01-12 by HttpPlugin
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  • Open service 2a00:f48:2000:affe:fe00::30:80 · jim.bttr-software.de

    2026-01-12 17:21 

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  • Open service 2a00:f48:2000:affe:fe00::20:80 · jim.bttr-software.de

    2026-01-12 17:21 

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  • Open service 2a00:f48:2000:affe:fe00::30:443 · jim.bttr-software.de

    2026-01-12 17:21 

    HTTP/1.1 200 OK
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Date: Mon, 12 Jan 2026 17:21:43 GMT
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Page title: The Deturbulator Project

<!DOCTYPE html>
<html lang="en">
<head>
<title>The Deturbulator Project</title>
<meta charset="utf-8" />
<meta name="description" content="This project was an effort to improve aircraft performance by testing a novel technique for boundary flow control on a Standard Cirrus glider with a…" />
<meta name="author" content="Jim Hendrix" />
<meta name="generator" content="Datenstrom Yellow" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" type="text/css" media="all" href="/assets/stockholm.css" />
<link rel="icon" type="image/png" href="/assets/stockholm.png" />
</head>
<body>
<div class="page layout-default">
<div class="header" role="banner">
<div class="sitename">
<h1><a href="/"><i class="sitename-logo"></i>The Deturbulator Project</a></h1>
</div>
<div class="sitename-banner"></div>
<div class="navigation" role="navigation" aria-label="Main">
<ul>
<li><a class="active" aria-current="page" href="/">Home</a></li>
<li><a href="/summary/">Summary</a></li>
<li><a href="/articles/">Articles</a></li>
<li><a href="/archive/">Archive</a></li>
<li><a href="/files/">Files</a></li>
<li><a href="/participants/">Participants</a></li>
<li><a href="/groups/">Groups</a></li>
<li><a href="/contact/">Contact</a></li>
</ul>
</div>
<div class="navigation-banner"></div>
</div>
<div class="content">
<div class="main" role="main">
<h1>Overview</h1>
<p><a href="/media/downloads/DeturbulationNutshell.pdf"><img src="/media/images/deturbulationnutshell-200w.jpg" width="200" height="137" alt="Deturbation In a Nutshell" title="Deturbation In a Nutshell" class="right" /></a>
This project was an effort to improve aircraft performance by testing a novel technique for boundary flow control on a Standard Cirrus glider with a Wortmann airfoil. Progress has been slow because the work was done with private funding and equipment. This work began in 2003 as a cooperative effort by Dr. Sumon Sinha and <a href="/jim">Jim Hendrix</a>. However, it split into separate efforts when it became clear that the objectives of the participants were not compatible.</p>

<p>Until March 2011, it could only be said that we had demonstrated the viability of a new method of boundary flow control on Wortmann wings. Now, it appears that there is a simple, cheap and practical <a href="/Progress-03192011-15Cheap">modification</a> that offers up to 15% improvement. Applicability to modern airfoils remains to be tested.</p>

<p><a href="/johnson"><img src="/media/images/johnson-120w.jpg" width="120" height="108" alt="Deturbation In a Nutshell" title="Deturbation In a Nutshell" class="left" /></a>
In December 2006, my glider was taken to the legendary <a href="/johnson">Richard H. (Dick) Johnson</a> for independent testing. Johnson confirmed average improvements of <strong>13% to 18%</strong> at 50 knots indicated airspeed. He measured sink rates manually using his time honored methods. Johnson summarized his <a href="/media/downloads/Johnson-Report.pdf">report</a>, with the conclusion that "<strong><em>the new Sinha Deturbulator could be the first really significant drag-reducing aerodynamic invention since the development of the now-common laminar-flow airfoils that were developed some 65 years ago.</em></strong>"</p>

<p>A properly sized rear-facing step near the leading edge of a precision, composite wing can produce significant performance improvements. This method (1) reduces form drag by keeping the laminar detached boundary flow close to the surface (reduces effective wing thickness), (2) reduces surface area exposed to laminar skin friction over the front of the wing and (3) reattaches the flow gently, at a grazing angle, for less energetic attached turbulent flow over the aft section of the wing. On the top surface, this requires a delicate balance of conditions that is extremely effective at a precise airspeed. This balance can be maintained manually for about 1.5 minutes by holding the airspeed constant. Beyond that, a custom designed, pitch autopilot fed with boundary flow sensors might hold it indefinitely. This extreme per
    Found 2026-01-12 by HttpPlugin
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  • Open service 2a00:f48:2000:affe:fe00::10:80 · jim.bttr-software.de

    2026-01-12 17:21 

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jim.bttr-software.de
Fingerprint:
ebd1b54dbbeff04fa8f6bf3d2fd3cfd6ff0aac60a18a04fd9035b9c14d577f38
CN:
jim.bttr-software.de
Key:
ECDSA-256
Issuer:
E8
Not before:
2026-01-12 16:23
Not after:
2026-04-12 16:23
Domain summary

jim.bttr-software.de 5

1 recorded
IP summary

2a00:f48:2000:affe:fe00::20 1 2a00:f48:2000:affe:fe00::10 1 2a00:f48:2000:affe:fe00::30 1

3 recorded

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