Today's Message Index:
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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
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| Subject: | Prop pitch lower rpm limit |
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
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| Subject: | Re: Prop pitch lower rpm limit |
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
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http://forums.matronics.com/viewtopic.php?p=408828#408828
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