View Single Post
  #3  
Old May 30th 06, 06:44 PM posted to rec.aviation.homebuilt
external usenet poster
 
Posts: n/a
Default Starduster Too, first flight, busted prop


"Ian Stirling" wrote in message
...
Al wrote:
Well, a friend finally got his starduster too in the air. He finished
it
this last winter, and has been preparing for his first flight, The flight
went well, apparently normal until shutdown. There was about 6 " of prop
missing from each end, and what was left was shattered back another 6-8".
His landing was in full stall attitude and no pieces were found on the
runway, no one heard anything, so we've pretty much ruled out a ground
strike. The videos show a perfectly normal flight although in one of the
low
passes, one of the observers heard a whistling sound. I've got pictures
heading this way, and should have them posted by tomorrow. The pilot was
as
surprized as the rest of us by the lack of vibration, and evidently what
was
left of the prop continued to produce thrust.


I can only suppose this to be torsional vibration?
At some RPM, the propeller is twisted so hard in such a way to make the
ends of the prop wiggle off.
This sounds modereately unlikely - I would expect much more of the blade
to break off.


It had metal tips, if that helps. Don't most radial engines run wood
props? Maybe we had the wrong prop for the engine? I'll see if I can get
model numbers. I have one picture of the aircraft showing the
prop,('before') and will post it at alt.binaries.pictures.aviation, followed
by the 'after" pictures(probably tomorrow)

Al