SinhaTech - Sinha Deturbulator Development Progress Reports

Sinha Deturbulator Progress Reports

Progress Articles

6/21/2003	Drag measurement instrumentation
9/17/2003	First successful test of Sinha deturbulator on a glider
10/18/2003	Further drag reductions on Standard Cirrus wing
	A comparison to turbulators
	Baseline polar for performance testing
2/8/2004	Progress Report: SSA Convention in Atlanta
2/28/2004	First outer-span test
5/27/2004	Wind tunnel goes into operation
8/31/2004	Stereolithography used for wind tunnel wing sections
12/3/2004	First success on upper surface of Standard Cirrus wing
12/12/2004	More success on upper surface of Standard Cirrus wing
2/18/2005	First Sink-Rate Measurement (revised 3/13/2005)
2/26/2005	Second Sink-Rate Measurement: Some Encouraging Data
3/19/2005	First Parallel Flight: More Encouraging Data

3/19/2005	Measurements with Full Top Surface Deturbulation
9/12/2005	A Performance Endurance Issue
10/29/2005	It’s Deturbulation Time Again
1/9/2006	Paper Presented at AAIA Annual Conference
2/3/2006	Talk Presented at SSA Annual Convention
5/6/2006	Paper Presented at AAIA Flow Control Conference
7/1/2006	Notes on Endurance and the Temperature/Humidity Issue
10/21/2006	Measurements Show 20% Improvement! (revised 1/3/07)
12/13/2006	Deturbulator Performance Confirmed!
1/2/2007	Calibrated Airspeeds
12/13/2006	Summary of Johnson Flight Test (revised 2/10/2007)
12/13/2006	Details of Johnson Flight Test (revised 12/26/2007)
12/01/2007	Johnson Effect Confirmed (revised 12/26/2007)

Publications and Presentations

1/9/2006	Sailplane Performance Improvement Using a Flexible Composite Surface Deturbulator - Sinha (PDF, 1174 KB)
6/5/2006	Drag Reduction of Natural Laminar Flow Airfoils with a Flexible Surface Deturbulator - Sinha (PDF, 757 KB)
2/10/2007	Wing Surface Deturbulators - Johnson (PowerPoint, 2140 KB)
2/10/2007	Revolutionary Aerodynamics - Sinha (PDF, 856 KB)

2/10/2007	Two Years on Deturbulated Wings - Hendrix (PowerPoint, 395 KB)
6/26/2007	Optimizing Wing Lift to Drag Ratio Enhancement with Flexible-Wall Turbulence Control - Sinha (PDF, 588 KB)
8/6/2007	Improving Automotive Fuel Efficiency with Deturbulator Tape - Sinha (PDF, 1368 KB)
2/14/2008	Extreme Performance - Hendrix (PowerPoint, 1.4 MB)

Calibrated Airspeeds (1/2/2007)

Prior to the Caddo Mills flight tests from 12/13/2006 through 12/23/2006, data were presented on this web site referenced to instrument calibrated values determined by Dr. Sinha and me. Thanks to Dick Johnson and the Dallas Glider Association, we now have a complete airspeed system calibration for Standard Cirrus #60. Therefore, future reports will reference aircraft calibrated speeds for this glider. However, when accurate values are not important to the discussion, descriptive text will use indicated airspeeds. The move to calibrated airspeeds reduced previous L/D calculations about 4%.

The following graphs present the instrument and system errors determined by Dick Johnson.

Our thanks to Dick Johnson, Jeff Baird and the entire staff at Southwest Soaring, Inc. and the Dallas Glider Association (DGA) for funding these flight tests.

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