wrote:

I was stunned when I discovered that the B2B uses a vertically running
engine *despite* having at least three gearboxes. The Exec uses a
vertically running engine because it does not have a gearbox.

So, you're telling us that the Exec rotor runs at engine speed?

I have to say that I never realized that Lycoming even made a vertical
version of the O-360.

And, you are also telling us you've never seen a Bell 47 (not the ones
with the Franklin)?

Gary