"Morgans" wrote in message
...

"Richard Lamb" wrote

So it *can* be done.
(The cannon firing thru the prop! )

I was curious to see if Bell had reduced the shaft RPM between the
engine
and gearbox, but it looks like 1:1 there.

Yep. The normal speed reduction unit for the prop is taken off, and put
at
the end of the shaft.

That might have been of interest to the OP, since his setup will likely
drive the shaft at prop rpm (after the psru).

Gonna take one tough (probably spelled h.e.a.v.y) shaft for that
service...


Are there any others?

There are numerous dual rotar sling wings that have an interconnected
rotor
shaft, but they are usually turbine engines. One example is the Osprey.

The normal Allison AC engine also had an active fluid torsional resonance
reducer at the non driven end of the crankshaft on the engine, and a
torsional reducer coupling (rubber) on the drive end. I could not find
that info about the aircobra, but I'll bet they are there on that
application, also.
--
Jim in NC

Sounds like a pretty sure bet to me. BTW, Thanks--I had wondered what
Allison did to eliminate resonance.

Peter