A few guys here fly it with at 3000 without any mods to the Roo II.

But they take care not to overstress the airframe in flight. I dont think it will hold up to level flight at 450km/h and if you just yank the elevator to full up position for eksample

I saw a Roo II selfdestruct in midair last year. The aluminium wingspar had riped through the upper surface of the fuselage.


My Roo II had a Sonic 120, and it had plenty of power........until I dumbthumbed it and it went in.