Stephan van Tonder wrote:uhm - swiftprop - there has been a fair amount(7 since 2006) of wing structural failure accidents on the 601 unfortunately so actually not an incredibly rosy picture for the ch601..
see some of it here.
http://www.homebuiltairplanes.com/forum ... 650-a.html
Hi Stephan,
Not quite right what you are saying.
The original 601HD ie the fat wing has zero accidents with regard to in flight break up.
The 601 XL which has the alleged wing problems also has a new wing design, no longer the fat wing. Then to take this a step further for the 601 XL's the FAA is looking at 4 accidents of alleged in flight break up and they seem to have the following causes:
And I quote from an article By Mark Townsend from CanZac Aviation.
one involved not wearing a seat belt in a thunderstorm by a novice pilot,
another seems to have been an unsecured wing spar ( either no bolts or no nuts on the bolts).
One possibly over gross with near limits maneuvers,
even a pelican strike through the canopy had first been announced as a failure, when in reality none had happened,
another ran out of fuel but instantly the wrong information gets published by the armchair engineers.
End of quote.
The full text can be seen in the link you provided
To date the FAA has not grounded a single 601HD/HDS (the fat wing) nor has it grounded the 601XL range with the new wing design.
Speculation will continue until the FAA publish the full reports, but until they do they will not make a statement and Zenith Aircraft are also not allowed to make any statements until the enquiries into the accidents have been completed.
My personal opinion of the aileron cable tension is as follows:
The plans for the 601 call for the aileron cables to have 35lbs tension in the rigged flight position at all times.
If this tension is not correct and the aircraft has an in flight flutter problem due to too loose cables this can hardly qualify as bad design of the aircraft, rather the builder of the aircraft should look at his workmanship/ inspection shedule.
The last thing we must keep in mind is that flutter usually occurs at speeds higher than VNE, now why would a pilot be in that flight regime?
Kind regards,
Gunter Rostek.