On Sunday 19 June 2011 10:50:01 John Denker wrote: > On 06/19/2011 06:46 AM, Jon S. Berndt wrote: > > Maybe I've gone wrong somewhere here, but something similar might work. > > Also, in situations like a flat spin or tail slide this probably falls > > apart! > > Let's postpone discussion of exotic flight conditions such as flat > spins and tail slides. There are much more prosaic situations that > need to be addressed. Let's start by getting the aircraft to behave > properly when > a) _taxiing_ with a crosswind and/or tailwind, and > b) _landing_ and _taking off_ with a crosswind and/or tailwind, > > These seem like basic and fundamental features.
<Snip speculation and rumor> > The value of these features can hardly be exaggerated. For example, > according to page 4-3 of the POH the "maximum demonstrated crosswind" > for a C-172 is 15 knots. <Snip long ramble and speculation> > c) _engine out_ (asymmetric thrust) in a twin, We already model asymmetric thrust. > d) simple _inverted flight_ ... not an inverted flat spin, just > plain old inverted flight, such as people routinely do in a > Cessna 150 Aerobat. Aerodynamically, inverted flight is already possible. > e) The effect of propwash on trim and on elevator authority. > This is a big deal in some aircraft, including the 152/172/182 > family. <Snip more long off-topic rambling and speculation> So, I set up a soft field take off in JSBSim stand-alone with a 15 knot crosswind using the c172p that is in FGFS git: Rotation 13 seconds @41 knots 375 feet Lift off 19 seconds @58 knots 800 feet Distance over 50' 2150 feet Heading Error >45 degrees Then I added the induced thrust which was the topic of this thread in the first place: Rotation 1 seconds @3 knots 3 feet Lift off 20 seconds @55 knots 900 feet Distance over 50' 2550 feet Heading Error <3 degrees Rudder deflection 34% Thanks, Ron ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
