Timeline for P Factor vs Spiral Slipstream
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 30, 2023 at 4:02 | comment | added | Forbes | Any aerodynamics experts out there? | |
| Jan 30, 2023 at 3:56 | comment | added | Forbes | My initial deductions are that the vertical tail was mostly clear of the propeller slipstream when inverted due to the high angle of attack, and that the P-factor (which should have been the same inverted as upright) is a very small effect compared to the Spiral Slipstream effect created by the propeller. The ability to conduct a flat turn without rudder seems to show that the spiralling slipstream has a very large effect at high power and slow speed in aeroplanes like the Pitts S1 | |
| Jan 30, 2023 at 3:29 | comment | added | Forbes | The Pitts was then returned to 3000 ft, rolled inverted and put into a 70 knot full power climb with wings level. When both feet were held off the rudder pedals, the a/c yawed slightly to the pilot’s left, hardly discernible. | |
| Jan 30, 2023 at 3:28 | comment | added | Forbes | I got the following results today in a Pitts S1S with a 180 HP Lycoming IO 360 and 76 inch diameter Sensenich 2 blade prop with 61 inch fixed pitch. Upright in a 70 kt full power climb starting at about 3000 ft, wings level, ball in the centre. When the right rudder was released and the feet held clear of the pedals, the a/c yawed to the left about 45 degrees quickly. Then with the wings held level with right aileron and holding 70 kts, the left yaw continued in a flat turn at about 9 deg per second and this was allowed to continue for 180 degrees. Continued below. | |
| Jan 21, 2023 at 14:35 | answer | added | Charles Bretana | timeline score: 1 | |
| S Jan 21, 2023 at 5:31 | review | First questions | |||
| Jan 21, 2023 at 8:27 | |||||
| S Jan 21, 2023 at 5:31 | history | asked | Forbes | CC BY-SA 4.0 |