I just looked at the data for the ch47, and I think there are some values that could/should change, based on the data for our own chinook flight dynamics model (for the CH47D)
rotor parameters: blade mass -> 111.6 [kg] omega -> 23.562 [rad/s] (=225 rpm) <- value much too high in yasim config file blade twist -> -9.14 [deg] blade chord -> 0.81 [m] <- value too low in yasim config file blade moment of inertia (about flap hinge) -> 3110.2 [kg*m^2] and some mass & moment of inertia values: mass -> 14968.6 [kg] ixx -> 50386.3 [kg*m^2] iyy -> 273536 [kg*m^2] izz -> 257685 [kg*m^2] ixz -> 19838.3 [kg*m^2] I don't have data about pitch-flap coupling. Greetings, Wim On 12/20/06, Joacim Persson <[EMAIL PROTECTED]> wrote: > On Tue, 19 Dec 2006, Maik Justus wrote: > > Important info for the ch47d flight model. I had expected a large delta3 > > effect. > > Forgot to mention that the chinooks do however have lead-lag hinges which > may have a blade pitch coupling to it, I don't know (yet). We don't have > lead-lag hinges in the rotor calculations anyway. (yet -- nudge-nudge > wink-wink ;) > > Speaking of delta-3, I saw a litterature reference giving a hint that > Boeing did perform experiments in the mid 60' with a delta-3 rotorhead, but > for some reason only on the forward rotor. I've found no evidence that this > ever was introduced in production models, not up to the D model anyway. > > PS. I've finally figured out the LCT algorithm, from studying explicit data > on the B model. Flying perfectly level at 60kts now. (Also using wind > tunnel data for the fuselage drag at alpha=beta=0.) > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > -- Avoid hangovers - stay drunk! ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
