---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Wed 09/18/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:55 PM - Prop pitch lower rpm limit (Richard Girard) 2. 08:55 PM - Re: Prop pitch lower rpm limit (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 04:55:09 PM PST US Subject: RotaxEngines-List: Prop pitch lower rpm limit From: Richard Girard A customer's purchased airplane, a Just Aircraft Highlander, with a 912 ULS and Kiev prop is set for 4900 rpm in climb. I believe he'd be happier if it were set at 5200. Certainly he would get better climb and the airplane is not a speedster so I'm not that concerned about what he'd lose in cruise flight. I'm also concerned about case cracking. I've been through the archives and through the Service Bulletins and cannot find any reference to a lower limit and a link cracking. Is it myth, legend, rumor or documented by Rotax? Rick Girard -- Zulu Delta Mk IIIC Thanks, Homer GBYM It isn't necessary to have relatives in Kansas City in order to be unhappy. - Groucho Marx ________________________________ Message 2 _____________________________________ Time: 08:55:31 PM PST US Subject: RotaxEngines-List: Re: Prop pitch lower rpm limit From: "Roger Lee" Case cracking is very real and has happened to several people. It usually happens to the older cases from roughly May 2006 and previous. They all came from too much stress from too much prop pitch. So long as your friend can see at least 5500 (5600-5650 is would be better) he most likely won't ever have an issue. 4900 in climb has a few variables, but should be around 5500 WOT in flat and level flight. People with the older engines only seeing 5200+/- rpm WOT in flat and level flight are playing Russian roulette. They may win for a long time, but one day may be it. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=408828#408828 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-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/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-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.