[vezePilot]

So my next upload will apparently be this Unmanned Combat Air Vehicle developed by Boeing for the Air Force:

http://www.vigilance...oeingUCAV_1.jpg

Yaw stability in the tailless design is not a problem, and it flies and handles pretty well already. The only problem I'm having with it is that the elevons (combining roll and pitch control) suffer from control flutter at speeds above 350 Knots indicated. So I figured instead of just thrashing through this problem as I've done many times in the past, I'll ask what other designers have discovered and done to avoid flutter.

http://www.vigilance...oeingUCAV_2.jpg

I'm even running simple, preliminary bomb runs with it over Area 51:

http://www.vigilance...oeingUCAV_3.jpg

I started this effort as a lead-in to producing the larger and more capable Boeing X-45N ... the Navy version which will be doing automated carrier approaches and arrested landings in about two years from now. Boeing is currently building the first N version, and they are developing the automated landing hardware/software using a modified F-18 Hornet.

Anybody discovered good solutions to cure control surface flutter? (my frame rates are above 85 FPS in X-Plane v8.40)

[brett s]

Fix the artificial stability constants that are causing it (by being too aggressive), unless your framerate is on the low side - then getting it higher can sometimes cure it.

[vezePilot]

Yup, that fixed it. Thanks, Brett. Now it's rock-solid stable and handles nice out to over 450 knots indicated. The panel for this will be derived from the panels in my SA-2 and Nike Hercules SAM missiles ... a controller's console replicating a ground control station for the unmanned aircraft.