"Jim Macklin" wrote in message
...
Google found this
http://www.cs.clemson.edu/~steve/Spiro/electra1.html

The second page of the above story is located at:
http://www.cs.clemson.edu/~steve/Spiro/electra2.html
(The link embedded at the end of the first page is obsolete)
Peter



"Dudley Henriques" wrote in message
...
|
| "Morgans" wrote in message
| ...
|
| "Dudley Henriques" wrote
|
| The Lockheed Electra sure could have used a prop AD for
this one!
|
| So there was a RPM restriction on the Electra?
|
| What do you recall? Didn't a constant speed prop pretty
much bypass it?
| --
| Jim in NC
|
| I only have a vague recall on this. It came up during a
safety meeting at
| the Naval Test Pilots School many years ago.
| If I remember right, it involved a harmonic mode (whirl I
believe) not
| transmitting correctly through the outboard engine mounts
on the airplane.
| They specified certain conditions that caused this to
happen but I don't
| remember what they were. I seem to recall that after the
issue was addressed
| by Lockheed and the mounts were redesigned, there was a
further wing issue
| as well that had to be dealt with.
| I think Macklin will probably be the guy who can best deal
with exactly what
| was going on.
| Dudley Henriques
|
|