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by hammax
Thu Aug 13, 2020 7:03 am
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 11
Views: 389

Re: Help in designing an Archimedes Wind Turbine

... I see in the linked website some CFD pictures of this "Archimedes" blade. I also made a very quick and dirty trial to check the unfolding and bending of the blade with cardboard. A disc with diameter 440mm cut into half could do it. The axle is an aluminum pipe with a square cross section able t...
by hammax
Tue Aug 11, 2020 1:18 pm
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 11
Views: 389

Re: Help in designing an Archimedes Wind Turbine

... my estimation is:
unrolling the blade gives a regular disc. Maybe some sector must be cut out => better not after some finetuning.
A simple part in aluminum with some bolts and a pipe as axle.
3 blades.


ArchWindTurbine_5.PNG
ArchWindTurbine_5.PNG (42.5 KiB) Viewed 158 times
by hammax
Tue Aug 11, 2020 8:44 am
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 11
Views: 389

Re: Help in designing an Archimedes Wind Turbine

... which way does the wind come from?


ArchWindTurbine_4.PNG
ArchWindTurbine_4.PNG (45.85 KiB) Viewed 211 times
by hammax
Tue Aug 11, 2020 6:33 am
Forum: Help on using FreeCAD
Topic: Help in designing an Archimedes Wind Turbine
Replies: 11
Views: 389

Re: Help in designing an Archimedes Wind Turbine

... having some doubt concerning the aerodynamic efficiency of that prop,
here is a possible design method in FC.

ArchWindTurbine_3.PNG
ArchWindTurbine_3.PNG (49.47 KiB) Viewed 260 times
by hammax
Mon Aug 10, 2020 4:13 pm
Forum: Forum in Deutsch
Topic: Bastel mal wieder
Replies: 13
Views: 933

Re: Bastel mal wieder

... ich habe mir gerade den Teil des Videos von Min 9 bis 49 reingezogen. Mechanik-Vorlesungs-Reminiszenzen von vor 50 Jahren kamen wieder hoch. Und der Respekt vor den mehr oder weniger neuen Entwicklungen. Man sieht und bestaunt ja mittlerweile dank Internet viele dieser Beispiele in Bildform. Dam...
by hammax
Sun Aug 09, 2020 6:47 am
Forum: Help on using FreeCAD
Topic: Scaling in the Image Workbench
Replies: 4
Views: 119

Re: Scaling in the Image Workbench

... scaling pictures is rather empirical by making an overlay sketch to get distances.
Calculate the scaling factor and multiply XSize and YSize with it.

ScalePNG.PNG
ScalePNG.PNG (69.09 KiB) Viewed 67 times
by hammax
Sat Aug 08, 2020 12:05 pm
Forum: Help on using FreeCAD
Topic: Issues revolving a bezier curve in part workbench
Replies: 2
Views: 116

Re: Issues revolving a bezier curve in part workbench

... totally easy job in PartWB :
Sketch => RotationBody => 3D-Offset.
(5 minutes - without any education)
B_Vase.PNG
B_Vase.PNG (38.32 KiB) Viewed 74 times
by hammax
Thu Aug 06, 2020 5:59 pm
Forum: Users Showcase
Topic: Class-J yacht
Replies: 10
Views: 6115

Re: Class-J yacht

... Chris it was your idea/proposal, to cut off "negative" shapes by boolean operations. Up to now I always tried to form the frame BSplines as is. And the BSplines should have an identical structure, to get a smooth shape. It was a difficult task, coming from S-shaped frames to neighboring U-shaped...
by hammax
Thu Aug 06, 2020 3:28 pm
Forum: Users Showcase
Topic: Class-J yacht
Replies: 10
Views: 6115

Re: Class-J yacht

... finally could do ChrisG's J-class yacht also with CurvesWB Gordon surface.
(first run - some quick&dirty proceedings)
https://forum.freecadweb.org/viewtopic. ... 58#p421698

J-Yacht_4.png
J-Yacht_4.png (38.87 KiB) Viewed 632 times
by hammax
Tue Aug 04, 2020 4:37 pm
Forum: Open discussion
Topic: Curves workbench
Replies: 719
Views: 72457

Re: Curves workbench

... 3 years ago this yacht was one of my first boat fevers as an FC freshman.
Today I tried to do this halfhull with Gordon - no result.
The same with a Loft on some or all frames - catastrophic.
ChrisG's shape is up to now the only form able to work with.

Yacht_4.PNG
Yacht_4.PNG (27.49 KiB) Viewed 180 times

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