glider workbench
Forum rules
Be nice to others! Respect the FreeCAD code of conduct!
Be nice to others! Respect the FreeCAD code of conduct!
Re: glider workbench
a little motivation...
- Attachments
-
- keep_smiling.png (663.44 KiB) Viewed 4076 times
Re: glider workbench
Didn't know reverse engineering workbench has progressed so much.
P.S. Still can't do trees though!
P.S. Still can't do trees though!
Re: glider workbench
No, reverse engineering workbench is still only a advertising placeholder...triplus wrote:Didn't know reverse engineering workbench has progressed so much.
Last edited by looo on Thu Jul 05, 2018 2:34 pm, edited 1 time in total.
Re: glider workbench
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
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
Re: glider workbench
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
[1]https://proxy.duckduckgo.com/iu/?u=http ... -2.jpg&f=1
Re: glider workbench
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...
Might not be so easy to simulate...
Re: glider workbench
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...Mx74" wrote: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...
But I don't think parachutes are modeled with the offset.
- Attachments
-
- parachute.FCStd
- (7.59 KiB) Downloaded 141 times
Re: glider workbench
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.
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.
Re: glider workbench
yes you are right maybe they really take the offset into account. The unwrapped patterns are quite a bit different:
- Attachments
-
- flat_patterns.png (2.87 KiB) Viewed 3823 times
Re: glider workbench
progress: still some bugs, but the goal is not far away