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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Wed Sep 18, 2013 3:55 pm Post subject: Prop pitch lower rpm limit |
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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
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Sep 18, 2013 7:55 pm Post subject: Re: Prop pitch lower rpm limit |
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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.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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