investigating wing flutter

[iFoxRomeo]

@BIGNEWY

Well, the ailerons now work at speeds above Mach 0,9. But the strange wingflutter that plagued the Sabre since release is still there. I initially thought both effects, stuck ailerons and flutter, were connected. But it seems these things are not directly connected.

I made a video to show it. Please ask the team to look at this. In no manual of the F-86 such wingflutter is mentioned. When this flutter occurs the aileron effectiveness gets changed.

In 2013 this effect was ..."interesting"... but in 2021 its not adequate anymore

Have a look.

 

 

 

 

The Handbook tells of a twisting moment on the wings that casues the wing heaviness. But it doesn't speak of a fluttering wing. As I understand it, it is a constant moment that changes with airspeed and/or aileron displacement. But no flutter.

 

Excerpt from the Flightmanual F-86F April 1971

Section VI Flight Characteristics

Level Flight Characteristics

 

 

 

 

Maneuvering Flight

Below 5kft and above 570kts -> aileron control becomes sluggish, but again not fluttering wings.

 

Track from the video attached.

 

 

Fox

 

p.s. also the gap in the right wingtip is an old "feature"

 

Sabre_wing flutter.trk

[BIGNEWY]

I will mention it to the team. 

 

thanks

 

edit - split into new topic