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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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 Posted: Sat Oct 30, 2010 3:02 am Post subject: RotaxEngines-List Digest: 3 Msgs - 10/29/10 |
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In a message dated 10/30/2010 2:04:32 A.M. Central Daylight Time, rotaxengines-list(at)matronics.com writes:
| Quote: | Because rotax 912 crank is composite (almost incredible for a 4 stroke engine of
so high price) i'd like to know from rotax list experience if someone else has
experienced crankshaft problems on his 912 engine.
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How do you figure the crank is composite ? Having held it in my hands it is made of metal like every other crank. It just comes as one piece(including the rods) and yes it can fail like every other engine crank.
Dick Maddux
912UL
Milton,Fl
[quote][b]
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Gilles.Thesee(at)ac-greno
Guest
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| Posted: Sat Oct 30, 2010 3:47 am Post subject: RotaxEngines-List Digest: 3 Msgs - 10/29/10 |
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Catz631(at)aol.com a écrit :
| Quote: | In a message dated 10/30/2010 2:04:32 A.M. Central Daylight Time,
rotaxengines-list(at)matronics.com writes:
Because rotax 912 crank is composite (almost incredible for a 4
stroke engine of
so high price) i'd like to know from rotax list experience if
someone else has
experienced crankshaft problems on his 912 engine.
How do you figure the crank is composite ? Having held it in my hands
it is made of metal like every other crank. It just comes as one
piece(including the rods) and yes it can fail like every other engine
crank.
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Dick and all,
Nicola may have meant "assembled crankshaft" or something to that
effect, as opposed to "one-piece crankshaft".
Concerning Nicola's question. When one designs an engine, one has the
choice between one-piece con rods and assembled crankshaft or two-piece
con rods and one-piece crankshaft. Neither solution is superior to the
other, it all depends on the design goals that are to be met by the
projected engine. It has strictly nothing to do with the price of the
engine. Big radials, the moste intricate powerful aero engine mostly
have two or three piece crankshafts.
The Rotax engines show fairly good service life records despite being
poorly installed in some aircraft, and frequently abused. And yes, like
any other engines some of them do fail, especially when grossly abused
(eg overreved, overheated, lacking oil).
See http://contrails.free.fr/engine_rotax_casse.php (French only for
some time I'm afraid 
Best regards,
--
Gilles
http://contrails.free.fr
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