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Libraries & objects
About Archicad and BIMcloud libraries, their management and migration, objects and other library parts, etc.

how would you model this blade ?

Rakela Raul
Participant
can you please direct me on how to model this blade??
it has a thin area, a fat area and the tricky thing is the 'twisting' of the one end.
thanku in advance

windmill.jpg
MACBKPro /32GiG / 240SSD
AC V6 to V18 - RVT V11 to V16
26 REPLIES 26
Dwight
Newcomer
two meshes - one deflected up and over, one deflected down and around
Dwight Atkinson
Rakela Raul
Participant
Thanku Dwight, I will give it a try rt now....i was expecting to get some sleep tonite, but I guess that can wait till tomorrow nite !! thanku again ..
i have noticed several times that i underestimate the mesh tool..., i didnt even think of it !!
MACBKPro /32GiG / 240SSD
AC V6 to V18 - RVT V11 to V16
Dwight
Newcomer
The firm got shortlisted for three public art projects today otherwise I would model an example for you.

Trick: make your top mesh, then duplicate it and drop the central nodes for the bottom- this way the edges stay together.
Dwight Atkinson
Anonymous
Not applicable
Hello Raul,
Never underestimate the the mesh tool.
For controlled organic shapes in Archicad
it is often the only tool that can do it.
I was looking at your image and I don't
see the "twist" in the blade itself.
To me it appears that the pitch is controlled
by rotating the entire blade about it's long axis
at the hub unlike a normal propeller blade which
is twisted within the body of the blade.
Peter Devlin
Dwight
Newcomer
But I have an Otter prop here and the actual prop blade is quite flat - shaped like a wing with a tricky transitional twist at the base - unlike laminated wooden props from before WW2.

In Canada we had an airline pioneer named Max Ward who crashed his plane up North and built a prop. It is easier than it looks to build one - a saw, a drawknife and a spin balance.

At the Boeing museum in Seattle there's a shop drawing on cutting a block of wood to carve a prop. very pretty. Tried to use it to model a prop myself but too hard....
Dwight Atkinson
Anonymous
Not applicable
Hello Dwight,
Which type of propeller blade do you think
most resembles the blade shown in Raul's image ?
You would agree that this relevant to how to model
this object. If it has a twist in the body of the blade
then you would have to change the plane that you
use as the X,Y plane of the mesh.
Peter Devlin
Dwight
Newcomer
I'd make the blade like a wing and bulge the shoulder down into the pitch adjustment coupling.

Here's a set of profiles to consider:

http://www.greeleynet.com/~cmorrison/airfoil3.pdf
Dwight Atkinson
Anonymous
Not applicable
Thank you Dwight,
Now both Raul and I have the the section fairing lines
to make this kind of blade.
As usual, you have taught me something. This time about propeller blades.
Now I wonder if you know something about submarine propellers.
They are different from normal surface boat and ship propellers
Thanks,
Peter Devlin
Dwight
Newcomer
Of course they are different, designed to work underwater like that.

haha.

But I CAN tell you about sewage impellers.
Dwight Atkinson