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Old December 1st 06, 12:26 AM posted to rec.aviation.piloting
RomeoMike
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Posts: 136
Default Light twins not using contra-rotating propellers



Mark Levin wrote:


Out of curiosity does this have a marked effect on it's operation compared
with the other twins you've flown?
Any procedures different because of it?


My solo multi time is limited to light twins. The most noticeable
difference in "normal" flight is the decrease or absence of left turning
tendency in high AOA situations such as TO and climb because P factor
and torque from one engine cancels those factors from the other engine.
The other main difference with counter rotating props, of course, is the
lack of a critical engine. In other words, no more asymmetrical thrust
is produced if one engine fails compared to the other.Therefore, turning
tendencies are less when practicing critical engine out procedures (or
Vmc demos) than they would be in the conventional set up. I wouldn't say
that any procedures are different. One still practices the same things.
There is still a lot of asymmetric thrust in engine out scenarios. A
multi instructor once told me that a twin is like any other airplane,
but when it loses an engine it becomes a sled. I would add, "even if it
has counter rotating props."























































































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