Jeff Buy a 52 x 42 to 44 prop for climb prop. I used those pitch numbers and got 1000 fpm climb solo and 500 fpm or better max weight from a 1915 cc VW engine, before changing to a Corvair. Max speed was 145 mph. Now if you want to have several different props available in one, do as I did and order a Warp Drive 2 or 3 blade (3 blade is smoother and gives better climb) so you can ground adjust it. Then test the adjustments you want to make, document them, and then make sure you keep your protractor in the plane along with wrenches for adjustments. Then you can change to a climb prop "on the fly" to get out of a small field, and once you stop for fuel, you can change back to a cruise prop setting that you proved is good.
I have watched and read the list for 2 years and my conclusions are that both Ed Sturba and Culver over pitch props when they recommend them, so that they can re-pitch them (saying it is free but not always) until they make you happy. Honestly, they are afraid to tell you the honest truth which is, they have no CLUE what prop to recommend because there are so many variables with each airplane. But rather than tell you that, they tell you this is THE prop other guys with your plane are running with success. AS Mark L, Mar J, and me will tell you, there are ALOT of variables that effect the effectiveness of a particular prop. You will have to establish a baseline for testing and go from there. That is why I bought a prop that I can adjust on the ground and test. Once I find what pitch matches my length the best I may order a prop made to just that length to max performance. I do not want to sound like I am putting Ed or Culver down; just understand that it is nearly impossible for someone to match a prop correctly first time to a particular combination with so many variables. That is why there is 40 hours of testing. -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Jeff Provenzano Sent: Saturday, August 12, 2006 4:19 PM To: [email protected] Subject: KR> Prop help for Type IV VW Hello KR netters. This is my first time posting to the net. Please let me know if my netiquette needs help. I have searched the archives over and over. I can't seem to find enough information about prop selection. Can anyone help me decide what prop to use. I have a KR-2 that's pretty much plans built, with a 100hp VW Type IV engine. I plan on buying two props. First, I want to get a prop that will give me a cruise of somewhere in the 130-140 mph range. I realize this would be more of a climb prop for this engine, but I want to be able to quickly get off the 3500 ft grass runway I'm at (50 foot obstacle at either end). Also, since this is such a pitch sensitive aircraft, I don't want to be going too fast until I get used to flying my KR. Ultimately, I would like to travel with this KR cruising at around 180 mph. Any help would be greatly appreciated. Thank you. Sincerely, Jeff Provenzano [email protected] Shreveport, La 318-210-9870 _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] please see other KRnet info at http://www.krnet.org/info.html
