On Monday 17 Jan 2005 17:06, Vivian Meazza wrote: > Dave Martin wrote > > > On Monday 17 Jan 2005 15:31, Martin Spott wrote: > > > Dave Martin wrote: > > > > http://www.airshowphotography.com/videos/videos2.html > > > > > > Nice, a 45 degree turn just one wing-span AGL :-) > > > > > > Martin. > > > > I've been playing with the FDM and changing the line in the yasim file: > > > > <flap1 start="0.75" end="0.95" lift="1.15" drag="1.3"/> > > > > to > > > > <flap1 start="0.75" end="0.95" lift="2.0" drag="1.3"/> > > > > seems to give a realistic response at low speed. > > > > Just changing the lift factor of the aileron makes the detail in the > > videos > > flyable and doesn't seem to give any unrealistic behavior at full > > deflection > > etc (50% deflection seems about the same as 100% at low speeds). > > > > If anyone else would like to try her out with that lift factor change we > > can > > compare notes :-) > > The AN-225 is Lee Elliot's pet, but remember that air-shows are very often > done with minimum fuel and no load. Heuristically, a lift factor of 2.0 is > perhaps too high for a plain aileron. 1.2 - 1.5 would be normal, and with > drag to match. But I agree that as it is the aircraft seems on the sluggish > side. > > Regards, > > Vivian > I was originally testing with absolute minimum fuel and I could still get it into situations where it wouldn't lift the inner wing from 45' bank at 170kts.
I'm going to have a go with a figure of 1.5 for lift. One thing tho; the lift figure is the 'maximum' ie: at full deflection. Could we expect that the Aeileron might make that much at full deflection but such a deflection would also be structurally damaging to the aircraft at above takeoff / landing speeds. In the videos, the aeileron deflection used to induce high rates of roll doesn't appear that much. Dave Martin _______________________________________________ Flightgear-devel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
