164
edits
Icaro Laminar 13 MRX: Difference between revisions
Jump to navigation
Jump to search
→For nerds ... and hang glider pilots who want to survive this sport
| Line 104: | Line 104: | ||
All the points described here can be tested and verified using the FlightGear hang glider ''Laminar 13 MRX''. This should improve the understanding and might help to avoid extrem flight situations or to train safe recoveries from such situations. | All the points described here can be tested and verified using the FlightGear hang glider ''Laminar 13 MRX''. This should improve the understanding and might help to avoid extrem flight situations or to train safe recoveries from such situations. | ||
'''This section is still under construction.''' The current status is | '''This section is still under construction.''' The current status is June 03, 2025. | ||
As an introduction, reference is made to two threads in the German Hang Gliding Forum, in which the static and dynamic longitudinal stability of weight-shift controlled hang gliders is examined in more detail: | As an introduction, reference is made to two threads in the German Hang Gliding Forum, in which the static and dynamic longitudinal stability of weight-shift controlled hang gliders is examined in more detail: | ||
| Line 111: | Line 111: | ||
[https://www.gleitschirmdrachenforum.de/forum/gleitschirm-und-drachen-forum/ger-te-hg/924836-einfluss-von-b%C3%B6en-auf-l%C3%A4ngsstabilit%C3%A4t Einfluss von Böen auf Längsstabilität]. | [https://www.gleitschirmdrachenforum.de/forum/gleitschirm-und-drachen-forum/ger-te-hg/924836-einfluss-von-b%C3%B6en-auf-l%C3%A4ngsstabilit%C3%A4t Einfluss von Böen auf Längsstabilität]. | ||
The aim is to present here the most important topics to a broader and international audience, or in short: to translate them into English. | The aim is to present here the most important topics to a broader and international audience, or in short: to translate them into English. | ||
<br> | |||
Further discussions, comments, enhancements or amendments to the following can be made in the German Hang Glider Forum. | |||
All contributions are more than welcome - also in English if you want. | |||
| Line 325: | Line 329: | ||
The orange curve describes the change in angle of attack Δα induced by the gust (left y-axis). | The orange curve describes the change in angle of attack Δα induced by the gust (left y-axis). | ||
The blue curve | The blue curve shows the influence of the gust on the inflow velocity. This is best represented by the ratio of the dynamic pressure of the disturbed flow velocity to the dynamic pressure of the undisturbed velocity (right y-axis). The idea behind this is that the absolute air forces and the absolute momentum scale linearly with the dynamic pressure (P<sub>dynamic</sub> = 1/2*density*velocity<sup>2</sup>). This means, for example, that a doubling of the free flow velocity due to a gust leads to a 4 times higher air force and moment. Therefore, this representation is more meaningful than the application via the velocity ratio. The value is just the factor by which the undisturbed air force and the moment must be multiplied to obtain the new values with gust. | ||
<br> | <br> | ||
When comparing the curves for the two airspeeds, it is clear to see that gusts have a much more dramatic effect at low speeds, both in terms of strength and direction. | When comparing the curves for the two airspeeds, it is clear to see that gusts have a much more dramatic effect at low speeds, both in terms of strength and direction. | ||