164
edits
Icaro Laminar 13 MRX: Difference between revisions
Jump to navigation
Jump to search
→Gust directly from the front
(→References: add Literature I. Azaryev) |
|||
| Line 382: | Line 382: | ||
==== Gust directly from the front ==== | ==== Gust directly from the front ==== | ||
In the following, the first sequence in the video will be analyzed: Gust directly from the front. | |||
The hang glider is initially in a steady straight flight (CM=0). In a gust directly from the front, only the inflow speed changes, the angle of attack does not change. Therefore CM remains the same. But why does the hang glider then pitch up? | |||
<br> | |||
The previous diagram shows that the dynamic pressure increases by a factor of approx. 3.5. This does not have any effect on the absolute moment, as 0*3.5 is still 0. However, the air force / lift also increases by this factor. The hang glider is therefore accelerated upwards by the higher lift ( first without changing its attitude). The superposition of this rate of climb with the inflow velocity results in a reduction in the angle of attack. We move on the moment curve (blue curve in the moment diagram) to the left. Although the change in angle of attack and hence the increase in moment is only minimal, the ''absolute'' moment increases by a factor of 3.5, which in the end leads to the significant pitching up. | |||
<br> | |||
This is exactly what you can see in the video (but you have to look very closely): First, the red inflow vector becomes longer without changing its direction. Then, for a fraction of a second, you can see the vector turning downwards without the hang glider changing its attitude. Only then the hang glider starts to pitch up. | |||
==== Gust directly from above ==== | ==== Gust directly from above ==== | ||