On Wed, 14 Jun 2006 11:57:39 +0200, Georg wrote in message <[EMAIL PROTECTED]>:
> Melchior FRANZ schrieb: > > * Georg Vollnhals -- Wednesday 14 June 2006 03:02: > >> Take the BO105 and goo for a straight and level flight with 100-120 > > > knts. Then push the collective down. [...] > >> Try it with the BO105 - see what happens? > >> You are not only able to hold height with pulling the stick back > >but to > climb with up to 1500 ft/min until speed is low. > > > > That's "translational lift". You know, the thing people are claiming > > isn't implemented. :-} It's not realistic (as Maik himself says), > No. Translational list is an additional lift component related to > helicopter speed against the air and will start at about 12 to 20 knts > (depending on type of helo). This is a real big addition lift > component > together with (an unwished) roll and yaw component. > > but I'm not sure about the "dropping like a stone" thing. Normally, > > people compare a fully loaded real helicopter (because they are > > sitting in them as passengers together with several other people) > > with an unloaded sim helicopter. Put more weight into the bo, and it > > sinks faster, as one would expect in RL. > > > > m. > "falling like a stone" might be the wrong expression but was told me > by a RL pilot and demonstrated afterwards in a "hot" autorotation for > a short time from 2000 to 1000 ft. It is pretty impressive and the > vertical speed naturally depends on the type and configuration (ie > weight) of the helo that you fly, our BK117 should come up to more > than 2000 ft/min, a BO105 will be have some other numbers but > generally comparable. > You understand what one is doing when reducing collective? You reduce > the common blade-pitch angle to (nearly) zero (depending on the type > of helo you are flying). Of course, going into a heavy flare will > give you some lift for a short time until your horizontal kinetic > energy (speed) is reduced. But when I asked one of our experienced RL > pilots ..define "experienced." We need somebody experienced in autorotation, and these guys are rare and expensive. > about this scenario and what would happen, he told me that he could > (if ever) hold altitude for a *very* short time by pitching back but > could not make the bird ascend remarkably (what our FG helo does). > > OK, after all I want to say once again that I am not the real expert > for this, we should have an *experienced RL helo pilot* who is also > interested in flightsims to tell us what he thinks in general and > detail about our FDM. > But as I was very keen to learn all about helicopter flight behaviour > and technics and comparing different helo sim flightmodels by checking > the opinion of RL helo pilots I *just want to share* all I know with > you. People simply should be advised that there are very diffent views > regarding the actual helo FDM. > > I would feel pretty bad if we announce our helo FDM as "realistic" as > we have some nice fixed wing aircraft with "real life pilots and a/c > owners" approved flightdynamics, this would be bad for FG in common. > > Just my 2c, this discussion will probably never end :-) -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
