From: Lee E. <le...@sp...> - 2006-02-08 21:11:23
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On Wednesday 08 February 2006 20:53, Berndt, Jon S wrote: > > I'm working on an airship flight simulator with FlightGear > > for visualization. > > > > I checked Aircraft Downloads at FlightGear homepage, it > > seems there is no aircraft model for airships. Is there > > anybody could give me some suggestions about how to build a > > customized aircraft model, or where I can find some airship > > model compatible with FlightGear? Thanks. > > > > With best regards, > > > > -Joyce > > Joyce: > > I think you are in relatively new territory with airship > modeling - at least as far as FlightGear is concerned. I've > reviewed the document pages you sent a couple of weeks ago. > The major difficulty I see is in modeling virtual mass, but I > think there are also ways around that. The questions I have, > at the moment are these: > > 1) Do you know the aerodynamic coefficients and stability > derivatives? 2) Do you have a propulsion scheme picked out - > i.e. turbine and propeller? Piston engine? > 3) Is the control system complicated, or is it defined in a > simple block diagram at the moment? > 4) Can you quantify the virtual mass aspect of the flight > dynamics with an equation, or empirical data? > 5) Do you have performance data for your proposed airship? > 6) Do you have volume and bouyant gas specifics for the > airship? > > Jon Berndt > Development Coordinator, > JSBSim project > www.jsbsim.org There is the balloon fdm but I couldn't get it to work last time I tried. I had a quick look at it because I was interested in doing some airships:) LeeE |