On Nov 8, 7:46 am, Dudley Henriques wrote:
Does anyone have any more information on this phenomenon, and this
crash specifically? Also, are there any Super Electras still flying
and, if so, how did they solve this problem?
--

Do a search for Lockheed Electra, Tell City Crash, 1960 I believe.
Reference that with propeller whirl mode, and you should come up with
all you'll ever need to know about resonant frequency as relates to
destructive force.
DH

Dud,
Isnt Harmonics and Whirl Mode Flutter two diferent things ? I used to
fly a turboprop that had Whirl Mode issues (And a crash resulting from
this), but not any resonance restrictions. On the other hand, I flew
Scouts that when equiped with a certain propeller (For banner towing)
had restrictions on certain RPM ranges because of resonance issues.
They were traeted as two entirely different restrictions.
KFB