glider workbench

[looo]

a little motivation...

[triplus]

Didn't know reverse engineering workbench has progressed so much.

P.S. Still can't do trees though!

[looo]

Didn't know reverse engineering workbench has progressed so much.

No, reverse engineering workbench is still only a advertising placeholder...

[Mx74]

Hello,

Just by curiosity, how did you do to decrease the number of cell to 7? Even by removing all lines I can't go lower than 10 cells

[looo]

I pushed a commit which allows to create a glider with 3 cells. Some parachutes count double-cells as one cells. But in openglider there is no feature for double cells (like [1], 7 double cells = 14 cells) So if you want to model such a wing you have to set the full number of cells. A cell in openglider is defined by having two ribs(3d-airfoils) and one ballooning-function (additional material added to the lower and upper sheets)

[1]https://proxy.duckduckgo.com/iu/?u=http ... -2.jpg&f=1

[Mx74]

Ok, so you can't really design such a parachute with OpenGlider, as the "free" cell in the middle won't go up, and the shape of the panels will be wrong.
Might not be so easy to simulate...

[looo]

Ok, so you can't really design such a parachute with OpenGlider, as the "free" cell in the middle won't go up, and the shape of the panels will be wrong.
Might not be so easy to simulate...

for sure you can. We simple do not have all the tools available, but openglider itself is quite generic. I added some properties to adjust the offset of some ribs and also the aoa. I guess you have to adjust both parameters. The implementation is really simple. If needed we can also change this to be another feature where you can set the offset and delata_aoa of every cell. I guess ths could be done with some tables...

double_wouble.png (49.39 KiB) Viewed 3838 times

But I don't think parachutes are modeled with the offset.

[Mx74]

That looks great actually like that.
Adjusting visually the offset is already a great step ahead.

I was actually asking myself if they were modelled with or without the offset. I don't think so as they all look so basic, but when looking more carefully I think there would be much more wrinkle on the leading edge, coming form the loaded cell to the unloaded cell, if not.

[looo]

yes you are right maybe they really take the offset into account. The unwrapped patterns are quite a bit different:

[looo]

progress: still some bugs, but the goal is not far away

IMG_2821_small.JPG (460.76 KiB) Viewed 3386 times