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NASA-TR-D-747
Wind-tunnel tests of four - and six-blade single - and dual-rotating tractor propellers
Year: 1942
Abstract: 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.
Subject: AIRCRAFT
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:57:06Z | |
| date available | 2017-09-04T15:57:06Z | |
| date copyright | 01/01/1942 | |
| date issued | 1942 | |
| identifier other | QZONEEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/60436 | |
| description abstract | 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. | |
| language | English | |
| title | NASA-TR-D-747 | num |
| title | Wind-tunnel tests of four - and six-blade single - and dual-rotating tractor propellers | en |
| type | standard | |
| page | 27 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1942 | |
| contenttype | fulltext | |
| subject keywords | AIRCRAFT | |
| subject keywords | ANGLES (GEOMETRY) | |
| subject keywords | BODY-WING CONFIGURATIONS | |
| subject keywords | CLIMBING FLIGHT | |
| subject keywords | COEFFICIENTS | |
| subject keywords | POWER | |
| subject keywords | PROPELLER BLADES | |
| subject keywords | PROPELLER EFFICIENCY | |
| subject keywords | PROPELLERS | |
| subject keywords | PROPULSIVE EFFICIENCY | |
| subject keywords | TAKEOFF | |
| subject keywords | THRUST | |
| subject keywords | WIND TUNNEL TESTS |