Hi there, I'm making a JSBSim version of A6M2, and want to share with you guys about a constant speed propellers for WWII aircraft.
First I tried a default prop configuration generated by Aeromatic, but the propeller pitch was adjusted automatically. So I removed <minrpm> and <maxrpm> tags from prop configuration file and the manual pitch control seemed working fine (Thanks to Ron for advice). Technically it's not a constant speed propeller anymore, but the behavior of both propeller and engine is getting closer to the descriptions in some books that I have. However, there came another big problem - too much engine rpm in cruising with lower pitch. I tried to adjust the power table to avoid this happening but no clue. The engine still exceeded way higher than the maximum rpm (more than 2000 above maximum) in the lowest pitch when cruising. Maybe I need to find the proper power / thrust correlations, but it doesn't seem possible to me. As a workaround for this issue, I modified the power table to have higher value in lowest pitch where advance ratio > 1.0 even thrust value is zero. This way, it seems working fine - the rpm of the engine stays a bit higher than maximum rpm. But I'm not sure if this is a proper behavior of the constant speed props for warbirds. If you have any better idea, please let me know. If you get interested, please check out A6M2 from CVS and give it a try. The pitch is set to the lowest for climbing. You need to adjust the pitch to maximum in cruising. Though the thrust/power table looks very weird, it's getting closer to zero's behavior I guess. Constructive comments are very welcome. Best, Tat p.s. I'm also willing to simulate zero's manual boost controller in JSBSim. (not sure if it is possible though) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
