Thank you to all the visitors. You have made all the work on this hobby/project of mine so worthwhile. When I started this project I was so surprised to see all the interest from all over the world. I always feel like I'm the only person that loves propellers so much. But you have proven me wrong. There are lots of people all over the world that love propellers too. Below are the stats as of 11/14/18. They are very typical of the project from it's inception. Although, not shown in this visitor map, people from Alaska also visit the site from time to time.


I love that PROP_DESIGN can not only be used to design the most efficient propellers, and find out details of existing designs, but it can be used to show that everyone has common interests. In a time where everyone is so divided, PROP_DESIGN helps show we all have some things in common. I also hope by giving so much freely, it will encourage others to do the same. Everyone should try to make the world a better place and hopefully PROP_DESIGN is doing that in a small way.

Old Domains:

PROP_DESIGN was previously available at:


I closed those websites a long time ago. If any of them are live again, know that I had nothing to do with it. The only place I am currently hosting PROP_DESIGN is at:

The Software and Website:

I had many reasons for creating PROP_DESIGN and releasing it as open source, public domain, software. I began studying aircraft propellers, while attending college, in the early 1990's. I found it difficult, and time consuming, to obtain information on the subject. I also found that many papers did not include source code. With the advent of the internet, several aircraft propeller design programs became available. However, these were based on old methods and had many limitations that I was unwilling to accept. The main one being the inability to design swept propellers. I had been planning on combining the work of Adkins and Liebeck with that of McCormick, to allow for swept propeller design, until I found a code called PROPSY. I re-coded PROPSY from the author's Master's thesis. Over time, I found numerous and substantial errors with PROPSY. PROP_DESIGN fixes these errors and adds many new features. Releasing PROP_DESIGN as open source, public domain software, was my attempt at giving everyone easy access to the best aircraft propeller design information available.

Statement of Authorship:

Recently, I have seen someone claim they developed PROP_DESIGN. While they may have worked on their own version of PROP_DESIGN, no one has developed PROP_DESIGN but myself. I have not worked with anyone on it, nor would I. This was a labor of love and it's very disappointing to see someone claim they developed it (regardless of what they may have meant). Everything on this website, including the downloads, was developed all by myself. I'm more than happy for anyone to use, and develop PROP_DESIGN, for whatever purpose they like. But I don't like anyone claiming they developed PROP_DESIGN. When you develop your own version of PROP_DESIGN, that should be made clear. Perhaps by a different name for your software. This would be similar to how I reference PROPSY (which PROP_DESIGN stems from).

Anthony Falzone, the developer of PROP_DESIGN:

I am a U.S. citizen. I earned a BSME degree, due to my childhood interest in hovercars. I worked in the aerospace industry over twelve years, prior to retiring in 2008. I worked for the following aerospace companies:

  • Hamilton Standard (Now UTC Aerospace Systems)
  • Pratt & Whitney (Division of UTC)
  • McCauley Propeller Systems (Division of Textron)
  • Atlantic Inertial Systems (Now UTC Aerospace Systems)

I contributed to the success of many notable products, some of which include the:

  • Xian MA60 regional airliners
  • General Atomics Predator B (aka Altair and MQ-9 Reaper) UAVs
  • Raytheon AMRAAM air-to-air missiles
  • Boeing Minuteman III ICBMs

I also contributed to the success of some notable services:

  • First stage turbine blade testing and analysis
  • Transonic compressor rotor (known as an  IBR or Blisk) R&D for the AFRL CARL
  • ICBM inertial sensor R&D

My involvement with these products and services included:

  • Assisting with the FAA vibration certification of the Xian MA60 composite aircraft propeller installation
  • Performing tests and running analytical models, to determine the root cause of first stage turbine blade cracking
  • Designing the three blade, solid aluminum, constant speed, aircraft propeller for the General Atomics Predator B UAV
  • Using FEA to show there was a discrepancy in the hot and cold shape models of a transonic compressor rotor being studied and tested by the AFRL CARL
  • Performing a mathematical analysis which prevented the recall of hundreds of AMRAAM air-to-air missiles, by showing a manufacturing deviation actually improved performance
  • Using FEA, testing, and mathematical analysis to determine the root cause of a complex thermally induced vibration excitation issue with inertial sensors used on Boeing Minuteman III ICBMs
  • Leading a team and performing analyses wrt ICBM inertial sensor R&D

The most rewarding project was designing the aircraft propeller for the General Atomics Predator B UAV, due to the impact that the aircraft has had on humanity.