PROP_DESIGN is open source, public domain, aircraft propeller design software. PROP_DESIGN can also be used to design products similar to aircraft propellers:
Computer-aided design (CAD) is the use of computers (or workstations) to aid in the creation, modification, analysis, or optimization of a design. CAD software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. PROPDESIGN was released as open source, public domain software, so you are completely free to do whatever you like with it Note: In the past, aircraft propellers have also been called airscrews. This is due to the fact that, aircraft propellers work their way through air, in a manner similar to how screws work their way through solids. FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. FreeCAD is General Public Licensed (GNU GPL) free 3D CAD software. It has parametric modeling options. It can be used for layout drawings, mechanical and architectural 3D modeling purposes. As both a user of public domain CAD software and a supplier of CAD software to the government, I am interested in obtaining and supplying such software as efficiently as possible. I feel that the U. Government, by taking three relatively inexpensive actions, can increase the CAD productivity of companies in the defense industry.
- Axial Flow Fans
- Counter-Rotating Propellers
- Electric Ducted Fans - EDFs
- Geared Turbofans - GTFs
- Open Rotors
- Propfans
- Turbofans (both Rotors and Stators)
- Ultra-High Bypass Engines - UHBs
- Unducted Fans - UDFs
Macbook pro 4 1 sierra. Besides traditional aircraft, PROP_DESIGN can also aid the design of:
- Airboats
- Computers
- Drones
- Hovercraft
- HVAC Systems
- Radio Controlled Toys - RC Toys
- Unmanned Aerial Vehicles - UAVs
- Vertical Takeoff and Landing Aircraft - VTOL Aircraft
Public Domain Cad Software
PROP_DESIGN allows for the design of unducted or ducted aircraft propellers with straight or swept blades and constant or elliptical chord distributions. PROP_DESIGN can be used for all altitudes covered by the U.S. Standard Atmosphere of 1976. Propeller efficiencies of approx. 80-90% are easily attained, even for effective velocities as high as Mach .85. Static optimized propellers can have fan efficiencies close to 100%. Below are some other features of PROP_DESIGN:
- Extremely precise; error of less than 1E-8 for the two variables that the program iterates on, this can also be changed by the user, to obtain even more precision
- Requires few computational resources (i.e. minimal CPU, memory, and storage requirements)
- Executes quickly, even on mobile computing devices such as; laptops and tablets
- Computes the static condition, the case where there is no forward motion of the propeller
- Automatically determines the optimum propeller geometry for any operating condition that a solution exists
- Can be used with designs that incorporate stators or counter-rotation
- Designed from the ground up to make comparing two different aircraft propellers or two different operating conditions easy
- Creates aircraft propeller performance maps for fixed pitch and constant speed propellers
- Aids the creation of hot shape aircraft propeller/fan CAD software models
- Allows you to find the optimum Fortran compiler options for your CPU
- Very quickly and easily create 3d content for art and games, without having to do any propeller/fan design at all, using PROP_DESIGN_XYZ
- PROP_DESIGN was released as open source, public domain software, so you are completely free to do whatever you like with it
Note:
In the past, aircraft propellers have also been called airscrews. This is due to the fact that, aircraft propellers work their way through air, in a manner similar to how screws work their way through solids. This does not help to solve the mathematics of aircraft propeller design and analysis. However, it is a simple way of understanding how aircraft propellers function.
Author(s)
Abstract
Applying geometric and dimensional tolerances (GD&T) to part features in computer-aided design (CAD) software is essential so that the part will function properly and to guide downstream manufacturing and inspection processes. However, it is not well characterized how CAD software implements capabilities for a designer to apply GD&T to a part. Of course, CAD software vendors do their own internal testing of those capabilities and users evaluate CAD software so that it satisfies their CAD modeling requirements. However, there has never been any rigorous public-domain testing of CAD software GD&T implementations. To improve that situation, the National Institute of Standards and Technology (NIST) has developed a system to test implementations of GD&T in CAD software. Representative part geometry with GD&T applied to features was modeled in four of the major CAD systems. Errors with semantic representation and graphical presentation of the GD&T were collected and analyzed. The testing methodology, test results, and data analysis demonstrate how well the CAD system GD&T implementations perform. The testing project results can be used as a basis for future testing, methods, and standards to evaluate defects in GD&T applied to part features.Public Domain Cad Software Installer
Download Paper
Keywords
Public Domain Cad Software
