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Wind Tunnel Tests Of Eight Blade Single And Dual Rotating Propellers In The Traction Position
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Book Synopsis Wind-Tunnel Tests of Eight-Blade Single - and Dual - Rotating Propellers in the Traction Position by :
Download or read book Wind-Tunnel Tests of Eight-Blade Single - and Dual - Rotating Propellers in the Traction Position written by and published by . This book was released on 1941 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests of 10-ft. diameter, eight-blade, single - and dual - rotating propellers were conducted in 20-ft propeller research tunnel. Propellers were mounted at front end of a streamline body in spinners that covered hubs and parts of shanks. Effect of a symmetrical wing mounted in slipstream was investigated. Blade-angle settings ranged from 20 Degrees to 65 Degrees. Results indicated that dual rotation resulted in gains of from 1 to 8% in efficiency over single rotation for eight-blade propellers, but presence of a wing reduced gain about one-half. Greater power absorption caused by dual rotation over flight range and higher efficiency or thrust for range of take-off and climb was indicated.
Book Synopsis NACA Wartime Reports. Series L. by : David Biermann
Download or read book NACA Wartime Reports. Series L. written by David Biermann and published by . This book was released on 1941 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests of 10-foot diameter, eight-blade, single- and dual-rotating propellers were conducted in 20-foot propeller research tunnel. Propellers were mounted at front end of a streamline body in spinners that covered hubs and parts of shanks. Effect of a symmetrical wing mounted in slipstream was investigated. Blade-angle settings ranged from 20 Degrees to 65 Degrees. Results indicated that dual rotation resulted in gains of from 1 to 8 percent in efficiency over single rotation for eight-blade propellers, but presence of a wing reduced gain about one-half. Greater power absorption caused by dual rotation over flight range and higher efficiency or thrust for range of take-off and climb was indicated.
Book Synopsis Wind-tunnel Tests of Single- and Dual-rotating Pusher Propellers Having from Two to Eight Blades by : David Biermann
Download or read book Wind-tunnel Tests of Single- and Dual-rotating Pusher Propellers Having from Two to Eight Blades written by David Biermann and published by . This book was released on 1942 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Index of NACA Technical Publications by : United States. National Advisory Committee for Aeronautics
Download or read book Index of NACA Technical Publications written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1949 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Tests of Dual-rotating Propellers with Systematic Differences in Number of Blades, Blade Setting, and Rotational Speed of Front and Rear Propellers by : W. H. Gray
Download or read book Wind-tunnel Tests of Dual-rotating Propellers with Systematic Differences in Number of Blades, Blade Setting, and Rotational Speed of Front and Rear Propellers written by W. H. Gray and published by . This book was released on 1944 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: The advent of dual-rotating propellers has created a need for information concerning the effect of the number of blades of the front and rear propellers, relative rotational speeds, and small changes in the blade angles of the rear propeller. Results of aerodynamic tests of seven-blade propellers, which were considered as a possible arrangement to avoid vibration difficulties, are presented herein. Variations of relative blade angle and rotational speeds of the front and rear components of a six-blade dual-rotating propeller were also investigated. The test program was an extension of previous work on dual-rotating propellers at the NACA propeller-research tunnel; the propeller blades and test body were those used in the previous tests. The results indicated that envelope efficiencies of a seven-blade propeller with three blades in the front hub and four in the rear were form 0 to 1 1/2 percent lower than envelope efficiencies for the six-blade dual-rotating propeller; four blades in the front hub and three in the rear resulted in efficiencies 1/2 to 3 1/2 percent lower than those obtained with the six-blade propeller. This conclusion applies to blade-angle settings of the front and rear propellers to absorb equal power at peak efficiency when the rotational speeds were held equal.
Book Synopsis A Selected Listing of NASA Scientific and Technical Reports for ... by :
Download or read book A Selected Listing of NASA Scientific and Technical Reports for ... written by and published by . This book was released on 1949 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Tests of Single- and Dual-rotating Pusher Propellers Having from Three to Eight Blades by : David Biermann
Download or read book Wind-tunnel Tests of Single- and Dual-rotating Pusher Propellers Having from Three to Eight Blades written by David Biermann and published by . This book was released on 1942 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Tests of a Dual-rotating Propeller Having One Component Locked Or Windmilling by : Walter A. Bartlett
Download or read book Wind-tunnel Tests of a Dual-rotating Propeller Having One Component Locked Or Windmilling written by Walter A. Bartlett and published by . This book was released on 1945 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: The effect on the propulsive efficiency of locking or windmilling one propeller of a six-blade dual-rotating-propeller installation was determined in the Langley propeller-research tunnel. Tests were made of both pusher and tractor configurations, with the unpowered propeller both leading and following the powered propeller, which was set at a blade angle of 40°. The maximum propulsive efficiency of the powered propeller in combination with the locked or windmilling propeller was, in all cases, lower than that of the powered propeller operating alone. The locked propeller gave greater maximum propulsive efficiencies when used as a contravane to remove rotational energy from the slipstream than when used as a means for imparting initial twist to the air. The windmilling propeller, however, was equally efficient both leading and following the driven propeller. In the tractor installation, smallest losses in maximum propulsive efficiency were obtained when the unpowered following propeller was locked at a blade angle of 90° and when the unpowered leading propeller was allowed to windmill at a blade angle of 45°. In the pusher installation, equal losses in maximum propulsive efficiency were obtained when the unpowered following propeller was either locked at 90° or windmilling at 55°, but the unpowered leading propeller gave smallest losses when windmilling at 55°.
Book Synopsis Low-speed Wind-tunnel Tests of Single- and Counter-rotation Propellers by : Dana Morris Dunham
Download or read book Low-speed Wind-tunnel Tests of Single- and Counter-rotation Propellers written by Dana Morris Dunham and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Tests of Single- and Dual-rotating Tractor Propellers at Low Blade Angles and of Two- and Three-blade Tractor Propellers at Blade Angles Up to 65 [degrees] by : W. H. Gray
Download or read book Wind-tunnel Tests of Single- and Dual-rotating Tractor Propellers at Low Blade Angles and of Two- and Three-blade Tractor Propellers at Blade Angles Up to 65 [degrees] written by W. H. Gray and published by . This book was released on 1943 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Vibration Tests of Dual-rotating Propellers by : Mason F. Miller
Download or read book Wind-tunnel Vibration Tests of Dual-rotating Propellers written by Mason F. Miller and published by . This book was released on 1943 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration tests of six- and eight-blade tractor and seven- and eight-blade pusher dual-rotating propellers were conducted in the Langley Memorial Aeronautical Laboratory 16-foot high-speed tunnel chiefly to determine the severity of vibrations excited by blade passages. A pusher design with a wing located ahead of the propellers and displaced 50 percent of the propeller radius below thrust-axis was simulated. Measurements of vibratory stresses of the propellers were made for engine-speed ranges at low, intermediate, and high engine powers.
Book Synopsis Wind-tunnel Tests of Single- and Dual-rotating Tractor Propellers of Large Blade Width by : David Biermann
Download or read book Wind-tunnel Tests of Single- and Dual-rotating Tractor Propellers of Large Blade Width written by David Biermann and published by . This book was released on 1942 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decrease of peak efficiency with increased solidity was very low. Increasing the solidity four times decreased the maximum efficiency by only 6 percent for single rotation. The percentage change was even less than for dual rotation.
Book Synopsis Wind Tunnel Tests of Four- and Six-blade Single- and Dual-rotating Tractor Propellers by : David Biermann
Download or read book Wind Tunnel Tests of Four- and Six-blade Single- and Dual-rotating Tractor Propellers written by David Biermann and published by . This book was released on 1943 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-speed Wind-tunnel Tests of an Advanced Eight-bladed Propeller by : Paul L. Coe
Download or read book Low-speed Wind-tunnel Tests of an Advanced Eight-bladed Propeller written by Paul L. Coe and published by . This book was released on 1985 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Tests of a Dual-rotating Propeller Having One Component Locked Or Windmilling by : Langley Aeronautical Laboratory
Download or read book Wind-tunnel Tests of a Dual-rotating Propeller Having One Component Locked Or Windmilling written by Langley Aeronautical Laboratory and published by Hassell Street Press. This book was released on 2021-09-10 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Book Synopsis Low-speed Wind-tunnel Tests of an Advanced Eight-bladed Propeller by :
Download or read book Low-speed Wind-tunnel Tests of an Advanced Eight-bladed Propeller written by and published by . This book was released on 1985 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-Tunnel Tests of Single- and Dual-Rotating Tractor Propellers at Low Blade Angles and of Two- and Three-Blade Tractor Propellers at Blade Angles Up to 65 Deg by :
Download or read book Wind-Tunnel Tests of Single- and Dual-Rotating Tractor Propellers at Low Blade Angles and of Two- and Three-Blade Tractor Propellers at Blade Angles Up to 65 Deg written by and published by . This book was released on 1943 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests were conducted to determine the characteristics at low blade angles of propellers for which data at high blade angles are already available. In addition to the low blade-angle results, there are included data on two- and three-bladed propellers of the same blade design which have not been published and which cover a range of blade angles from 20 to 65 deg.
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