Test of 10-foot diameter, four and six blade single-rotating and dual-rotating propellers were conducted in the NACA propeller-research tunnel. The propellers were mounted at the front end of a streamline body incorporating spinners to house the hub portions. The effect of a symmetrical wing mounted in the slipstream ranged from 20 degrees to 65 degrees setting corresponds to airplane speeds greater than 500 miles per hour. The results indicate that dual-rotating propellers were from 0 to 6 percent more efficient than single-rotating ones; but, when the propellers operated in the presence of a wing, the gain was reduced by about one-half. Other advantages of dual-rotating propellers were found to include greater power absorption and greater efficiency at the low V/nD operating range of high-pitch propellers.
Wind-Tunnel Tests of Four- and Six-Blade Single- and Dual-Rotating Tractor Propellers
1942-01-01
Miscellaneous
No indication
English
Wind-tunnel tests of four- and six-blade single- and dual-rotating tractor propellers
Engineering Index Backfile | 1942
|Wind-tunnel tests of eight-blade single- and dual-rotating propellers in tractor position
Engineering Index Backfile | 1941
|Wind-tunnel tests of single and dual-rotating tractor propellers of large blade width
Engineering Index Backfile | 1942
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