We need to be given all the information because for the moment: apart from the fact that it is a propeller, we know nothing about its exact shape.
You give us the radius and the pitch but nothing about the constant angle, which is the angle formed between the horizontal plane and the wire of the coil.
But you follow your idea without apparently reading what we are proposing. To draw the propeller itself, you need to know the cross-sectional profile with, say, every centimeter along the length of 8 from the axis of the rotor to the end of the propeller.
Look here at the different sections of a propeller which shows well what I am trying to make you understand. If you can't establish the shape of what corresponds to a 90° cut from the vertical axis of the propeller. The vertical axis (blade axis) is defined by the center of the rotor axis and the tip of the propeller.
See the attached photo of M. A. Moirier (see the link at the end of the message)
On this forum we can only tell you technically how to do it with SolidWorks but from the information that you have to provide to make the sketches of each plan yourself and that you will not get on this AMHA forum because it is not its vocation.
As I want to reproduce a known propeller, I would need to know the profile, which is generally constant, the chord of the profile, the number of sections as well as the angles given to each profile in each section.
The number of sections is about 10 from the axis of the blade foot.
In model aeronautics, the profile is constant and therefore so are the gaps. An exception is at the foot of the blade where the profile is reinforced for the strength of the propeller. This is possible because the yield is negligible in this area.
Now the difficulty, for me, is to find the angle of inclination of each profile for a given step, in my case I would like to do an 8x4 so the step of 4. It is this calculation that I lack.
Knowing that the pitch is constant, the angle of inclination of your profile will vary according to your diameter. In principle, propellers are characterized in inches. I guess in your case, it's an 8" x 4" pitch diameter. But whether you calculate in inches or in mm, it won't change anything. You will always have the same angular results.
For example, if you want to know the angle of inclination of the profile at the tip of the blade, you have to calculate as follows:
Alpha ° = atan (pitch / Pi* Diameter)
Which should give you about 9° in your case. You will have to redo this calculation as many times as you have profiles to generate your smoothing. The angle will increase as you get closer to the center.
Great, it's progressing, I'm not a math person, can you confirm that atan is indeed tanh on the win7 calculator and if so that you have to first calculate what's in parenthesis and then press the tanh button
Not having the win7 calculator, I have a little doubt. In my case, the function to use on the calculator is TAN-1. Which is logical, you have to do the opposite of the tangent to find your angle. The rest of what you have noted seems correct to me. I simply suggest that you try to do the calculation and verify it by the result. You must get an angle of 9.043°
For the rest and in your case, a good solution would be to enter these values in Excel and to be able to quickly extract all your angular values according to the diameter. I'll try to give you an example. It will be simpler.
I had finally found the formula on the net, I am attaching the excel file.
On the other hand the last data I am missing is the rope and its variations, could you attach to me the SW file which corresponds to the capture you put in your excel file?
This is a test done a few years ago. I tried to model a propeller for indoor flight models. In such a case, it is not subject to the same stresses as a propeller for external flight. The file I have created is therefore purely indicative. It cannot be applied to an external solution.
Indeed, the profile is a bit peculiar and does not look anything like a usual profile.
Alternatively, the XYZ curve function allows you to draw a profile based on coordinates from a txt file. that I extracted from the SLDCRV file .
What surprises me in this file is that there are at the same time the coordinates that form the curve, the chord and the angle, the gap between each profile being the 3rd column Z, that I understood.
I attach the corresponding sldprt in the second message
Seeing the propeller modeled in your last post and its dimensions, I guess it's a file you got somewhere. In any case, it's a very good example of achieving what you're trying to achieve. However, the "know-how" is found in the orientation and positioning of the different profiles. This implies that having the SolidWorks file won't really help you if your goal is to be able to modify the different parameters of your propeller. (especially the PAS) On closer inspection, in the XYZ curve function, we refer to a script: propscript
If you search on the web, you will find the following information on GitHub: https://github.com/Nate711/propscript
It is likely that the profiles imported into your SolidWorks example come from this script.
I looked at the link and there is a file, apcsf_9x4.7_geom.txt, whose columns are similar to the first three of this one:
It's from the javaprop software whose site is here:
http://www.mh-aerotools.de/airfoils/javaprop.htm
But how do they integrate this script into the coordinate file and thus have the chord, the angle and the radius of each plane on SW, that's what it's all about because it's the case of each txt file imported with the XYZ curve??
So, what I can tell you is that the apcsf_9x4.7_geom.txt file contains the following information:
1st column (r/R) Positioning of the plane (ratio between the location of the plane and the nominal radius of your helix) 0 being the center of your helix and 1 is equal to the tip of the blade
2nd column (C/R) String of your profile. This is the length of your profile. (I don't know in what value it is expressed)
3rd column (beta) Angle formed by the profile.
Contrary to what we may have thought previously, the step is not constant on most of the examples seen in the software mentioned above. This is why the 3rd column (beta) exists. The value does not derive from a trigonometric calculation but from a function that I do not know.
Finally, this information could already allow you to start generating a smoothing in SolidWorks. You know the location of the plane, the chord of the profile, and the angle. That's what you wanted. What you might be missing is the rulers that position these profiles to form a harmonious blade...
Finally, the propscript software, which I tested, allows you to configure the parameters of a propeller by modifying its code. The script will generate a SolidWorks macro to create a smoothing of the blade. I don't understand it well because the code is relatively little commented on. For me it's still a black box... You should contact its author if you want to continue in this direction. You can find examples of macro code in the propscript software tree. If you paste this code into an SW macro, you can generate a blade.
Great, it works well under SW 2018 but with SW 2013 when I click on new, it crashes and it annoys me because it's with 2013 that I draw, the 2018 is only used to read all files.
In the scripts, there is a lot of data and especially the data that allows you to place the profile in relation to the first one, its angle and as well as the chord which also varies.
These are the only data that I lack and that I can't define.
I dissected the scripts and understood a little but to adapt them, it's not easy.
I located the part concerning the coordinates of the different profiles, easy it is written ;-)
I also located the position, it's the part that is at the bottom of the file, it would be the curve that forms all the points at the trailing edge, kind of guide curve.
Now we would have to find to adapt it to another profile, there too it's not easy...
I also recovered a file that looks interesting that I got here
http://www.aerodyndesign.com/PROP_10/PROP_10.htm
On the other hand I can't do it works with Excel 2007, but it works under 2003, weird...
