Contra-rotating engine revisited

Vacuum pumps are different (although these are accesories)
"Chris W" wrote in message
...
The previous post on this topic got me wondering. Just how different
would the two engines need to be? I'm no expert, but it seems to me
cam shaft(s), magnetos, and prop are the parts that would be different
from one side to the other. I almost forgot, reverse the polarity on
the starter motor. What am I missing?


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Chris W
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tom418 writes:

Vacuum pumps are different (although these are accesories)

What is the logic behind using vacuum to power instruments? Why not
just use an electric motor, or compressed air?

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Transpose mxsmanic and gmail to reach me by e-mail.

Mxsmanic wrote:
What is the logic behind using vacuum to power instruments? Why not
just use an electric motor, or compressed air?


Why don't you just think about what FAA's answer to that one is.
So obvious a Caveman can figure it out. Plus, compressed air
can be and is used. But not electricity, unless....

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"TxSrv" wrote in message
. ..


So obvious a Caveman can figure it out.

Too many Geico ads?