Pietenpol-List: prop size

matronics · Post by **matronics** » Fri Jan 21, 2005 10:03 am

Original Posted By: "DJ Vegh"
I have been reading a book on making propellers. Just for comparisons, what sizeprop do those flying with the Corvair engine use? Does the Corvair run atabout 100 hp? What is max rpm? What is the cruise speed you get?I have a Rotec radial engine on order. According to this book, I may have ordereda much too aggresive prop. The factory recommended a 72x55. I told themI wanted a climb prop, but I'm not going to be towing banners or gliders.ThanksDick N.________________________________________________________________________________

matronics · Post by **matronics** » Fri Jan 21, 2005 10:28 am

Original Posted By: Richard Navratil
my Corvair has a 66x29 on it, which for a Corvair is considered a climb prop. I'm not looking for fast cruise so I propped it for great climb.The Corvair puts out anywhere from about 90-110hp depending on how you build it.Max rpm in the Corvair is limited by the size of prop you use.... but I'mgoing to redlinemine at about 3300.DJ ----- Original Message -----

matronics · Post by **matronics** » Fri Jan 21, 2005 7:23 pm

Original Posted By: Les Schubert

matronics · Post by **matronics** » Fri Jan 21, 2005 8:48 pm

Original Posted By: Les Schubert
Thanks les &DJI'm trying to just get an idea if the guide in the book I have is accurate. Itindicates that a 72x55 will give me 107 mph at 2450 rpm prop speed. Yes, I canthrottle back for cruise and use the power for climb.Dick ----- Original Message -----

matronics · Post by **matronics** » Sat Jan 22, 2005 2:17 am

Original Posted By: Clif Dawson

matronics · Post by **matronics** » Sat Jan 22, 2005 10:43 am

Original Posted By: Clif Dawson
CliffI have "Propeller Making For The Amateur" by Eric Clutton. Thanks, I'll take a look at that web site.Dick N. ----- Original Message -----

matronics · Post by **matronics** » Sat Jan 22, 2005 12:16 pm

Original Posted By: Galen Hutcheson

Brodhead Pietenpol Association