{"id":3940,"date":"2016-02-16T18:56:39","date_gmt":"2016-02-16T08:56:39","guid":{"rendered":"http:\/\/wordpress.cpc-world.com\/?page_id=3940"},"modified":"2016-10-21T08:53:31","modified_gmt":"2016-10-20T22:53:31","slug":"propellor","status":"publish","type":"page","link":"http:\/\/pietenpol.cpc-world.com\/?page_id=3940","title":{"rendered":"Propeller"},"content":{"rendered":"

Prop building is an art, not a science…. or so I’m told. I had a look a more web sites and books on prop building than just about anything. They went into varying amounts of detail and complexity.<\/p>\n

Eventually it boiled down to Eric Clutton’s wonderful little book, “Propeller Making for the Amateur”, NACA Technical Manual No. 212 written by Fred E. Weick in 1925 and “How I make Wood Propellers” by Al Schubert. Al’s book is available for download at here<\/a>, (be aware this is an 11mb pdf file……..). Pictures from the booklet are available here<\/a>. Fred’s very good booklet is available on NACA<\/a>‘s web site, link is here<\/a>. Do a search at NACA<\/a>‘s web site for “Fred E. Weick” and you’ll see what a prolific writer he was on propeller design. Propeller Design Parts 1 to 4 make for good reading! I have had Eric’s book for a number of years but its available here<\/a>, amongst other places.<\/p>\n

(Update, some of these links no longer exist. Perhaps a Google search may be able to locate them)<\/span><\/p>\n

I correlated all the information and eventually produced an Excel spreadsheet that produced blade angles based on engine performance.<\/p>\n

\"blade_angles_jpg\"<\/a>The spreadsheet is available here<\/a>. In Al Shuberts book he discusses how he made the prop for one of Bernie’s Pietenpols with a corvair engine. It was a 64″ diameter x 32″ pitch prop, so I had an idea where to start.<\/p>\n

Using the blade angles calculated by the spreadsheet I then produced a Visio 2000<\/a> drawing of each station along the blade half.<\/p>\n