---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Tue 08/17/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:05 AM - Re: Propeller decision. (Naftali Horowitz) ________________________________ Message 1 _____________________________________ Time: 03:05:14 AM PST US From: Naftali Horowitz Subject: RE: JabiruEngine-List: Propeller decision. Hi Lynn=2C Did you hear about the french DUC Swirl ground adjustable? the X-Air is usi ng it with the JAB 2200. > From: lynnmatt@jps.net > Subject: JabiruEngine-List: Propeller decision. > Date: Mon=2C 16 Aug 2010 11:03:30 -0400 > To: jabiruengine-list@matronics.com > > > I've been asking folks on the YahooJabiru group about ground- > adjustable props=2C and came to a decision of sorts. Because some > Jabiru owners don't go there=2C I thought I'd share some figures with > this group=2C and maybe get some interest going about props=2C etc. > Here's the post that I made at Yahoo Jabiru: > > ************************* > Thanks to all who offered suggestions regarding the ground adjustable > prop. After reading and digesting the comments=2C and flying a couple > of times with my chopped-down 55.5" x 46" wood prop=2C I think I've > concluded that if I could match the performance of this bastardized > prop with a fixed pitch prop of a normal shape (after cutting=2C the > ends of my blades are blunt...no rounding-off was done)=2C I'd go with > it. What I mean is=2C if I could get Sensenich to use the numbers that > seem to give me good performance....the 55.5" x 46"....and make a > prop of say=2C 62" x 40 or 42"=2C I'd do it. I'll call them and see > what they suggest. This might be a good time to visit the Prince prop > factory=2C as they are within 100 miles. I just don't like the 16-week > wait=2C or the 16-days wait at 50% more money. : ( > > The ground adjustable thing seems to be an area with problems=2C as far > as the present is concerned=2C so I think I'll stay away from them. > > Here's the comparison between the 62x46 and the 55.5x46.....with the > 62=2C I get about 2810-2840 rpm climbout (@ about 6.4 gph fuel flow)=2C > and the 55.5 gives me 3000-3040 rpm=2C using 7.0 gph fuel flow. > According to the fuel use=2C the higher rpm's are giving me more > horsepower during climbout. I checked this morning=2C and my speed at > WOT straight and level=2C going nearly across the wind (northbound) was > 101 mph at 3210 rpm=2C and 123 mph at 3240 rpm going southbound. The > wind was reported at 3000' to be 281=B0 @ 29 kts. So the shorter prop > gives me the desired rpm's=2C but that's not the way to do it=2C > according to the theories that I've read and heard. > > I only flew for a little while=2C but during that time=2C the fuel usage > was comparable to what I've been seeing....around 2.9 to 3.2 gph > (running lean of peak EGT)=2C but the rpm was higher. I saw no change > in EGT's as a result of letting the rpm wind up a bit. > > ************************** > > The reason for wanting a different prop came about after I flew into > a moderately hard rain and it etched/blasted the leading edge of my > prop pretty badly. > > Lynn Matteson > Kitfox IV Speedster=2C taildragger > Jabiru 2200=2C #2062 > Sensenich 62"x46" Wood (summer) > Electroair direct-fire ignition system > Rotec TBI-40 injection > Status: flying...1040+ hrs (since 3-27-2006) > > > > > > =========== =========== =========== =========== > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.