by jentron » Thu Jun 09, 2011 3:44 am
hvengel wrote in Fri Dec 10, 2010 2:39 am:There are a number of JSBSim FDM's that have used xflr5/6 to generate lift/drag polars. The results start to get iffy at and beyond the stall point but my experience using these tools is that the polars beyond stall are plausible which is about all you can expect without access to a wind tunnel. It takes a lot of work to generate a full set of polars and you need to have at least a basic understanding of aerodynamics.
My last 3 JSBSim FDMs
Gloster-Meteor-jsb,
A6M2-jsbsim and
JetStar-II, have all changed from using Lift, Drag and Side to using Normal, Axial and Side. A brief discussion of the difference is on the
this wiki pageMy basic workflow is:
1. Generate one or more aeromatic FDMs for my aircraft. I will choose different 'types' of aircraft with an eye towards blending two or more results.
2. Move through the aeromatic FDM adjusting CG, gear contacts, propulsion locations, fuel tank locations.
3. Generate a simple datcom model (no control surfaces) and extract the cNormal, cAxial and cPitch tables from the .out file.
4. Do some 360 degree and ground effects magic.
5. Test and tweak.
Aircraft: F-4E, Cessna 182RG, Fi-156 Storch, Diamond DA20 Katana and Eclipse, Ercoupe, LZ-129, Gossamer Albatross
Airports: CYKF, CNC4, KHIF, 42U, KOXB, 4MD1