Contra-rotating engine revisited

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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"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?


--
Chris W
KE5GIX


Camshaft as you said.
Crank - they drill the holes for the oil to the rod bearings in a different
spot.
Magneto - the impulse has to work in the other direction. I don't know if
there are changes to the points for avaition applications.
Oil pump - has to pump in the other direction
Starter - the bendix is different, the brushes are re-located
Alternator - it may have a different cooling fan
vacuum pump
Prop as you said
Mechanical Tach, or the drive (I assume)

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

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....

F--

Anyone for the "Dutch Roll" discussion next?

Isn't that a cinnamon roll where you supply your own cinnamon?

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.

Chris W wrote:
The previous post on this topic got me wondering. Just how different
would the two engines need to be?

If propeller direction is all that you need to change, could you just
add a reverser gear?

"TxSrv" wrote in message
. ..


So obvious a Caveman can figure it out.

Too many Geico ads?

"Bucky" wrote in message
ups.com...
Chris W wrote:
The previous post on this topic got me wondering. Just how different
would the two engines need to be?

If propeller direction is all that you need to change, could you just
add a reverser gear?


How about one engine in the middle, with chain driven gears turning the
props on the wings.

Oh, wait. I think that's already been done.

Please do not feed the trolls!

Please do not feed the trolls!

MXs Maniac, sounds like a handle for a motocross rider or
wannabe...

Test for torque.

Jump your YZ400 and while in the air, open the throttle, why
does the front wheel move and which direction? Stab the
rear brake just before landing, why is that a bad idea?


Get your MSFS and setup the P51 Mustang with the big HS
prop. In flight at 75 mph and 100 feet, slam the throttle
wide open, report what happens?


"Nomen Nescio" wrote in message
...
| -----BEGIN PGP SIGNED MESSAGE-----
|
| From: Mxsmanic
|
| That's because the amount of torque changes with the
rotational speed
| of the engine. However, as long as it is turning, it is
exerting
| torque on the rest of the car.
|
| Dammit! I'm calling MIT tomorrow to demand my money back.
| Those *******s told me that it was proportional to angular
| acceleration.
|
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