This if from the August 2004 issue of AOPA Pilot:

'NASA's July 1971 final report reached three conclusions about the PA-30
Twin Comanche:

* At the stall, large rolling and yawing moments occurred as a result of
asymmetric wing stall. The left wing stalled, NASA said, at an angle of
attack about 2 degrees lower than the right wing.
* These rolling and yawing moments are larger than the corrective
moments produced by aileron and rudder controls.
* The airplane exhibits a flat spin under certain conditions involving
the use of asymmetric power.'

I interpret the first two items to apply to a Comanche with both engines
operative, with only the last referring to a single engine Vmc situation.


--
Mike Noel,
Tucson, Arizona

'Men never do evil so completely and cheerfully as when they do it from
religious conviction.'

-Blaise Pascal
"Mike Noel" wrote in message
. ..
I didn't notice anyone bring this up in the thread. The AOPA published
some
interesting stuff on the Twin Commanche without CR props since they were
giving one away last year. With the older style twin, if you slow it down
too much with the engines still developing thrust, it can flip over on its
back. One of the wings is effectively flying at a couple of degrees
higher
angle of attach due to the prop airflow. I think this is the main reason
the newer Twin Comanches went to CR props.

--
Mike Noel,
Tucson, Arizona

'Men never do evil so completely and cheerfully as when they do it from
religious conviction.'

-Blaise Pascal
"Dico" wrote in message
oups.com...
Hello,

We're looking into a twin and the Twin Comanche is on our list. I know
that the later models have the counter rotating props -- although i
don't know too much about what this means, other than its "better".

We fly a mooney now and thus I don't worry about the prop -- as long as
it keeps spinning.

Is there a web site that gives a good explanation as to why I want CR
props. There are hundreds of the earlier model Twin Comanches flying
without the CR props --- so what does someone with 300 hours single
engine time need to worry about? What actually goes wrong? And when
it does, what happens? I hear "critical engine" but it means very
little to me.

I like to fly and try to be very careful when I do fly... but I don't
follow too much aviation stuff other than how it affects me -- so I'm
not exactly a "buff", hence the above questions which may seem obvious
to many.

Why are we looking at a Twin Comanche? Because its a twin, safer for
IFR flight (perhaps this is only preceived), plus we live on the east
coast on an island so we're flying over water quite a bit. Also this
plane has decent speed and is an "economical" twin. We rarely fly with
4 people, so we don't need any more seats than 4.

Any help or links to help would be appreciated.

Thanks,

Dico