Am Mittwoch 21 Dezember 2005 19:47 schrieb Dave Culp: > Looks nice! Thanks! > First, does the C-310 model work well? I've never tried it, so I don't > know. If it does then I would start with the C-310 config and make changes, > one change at a time, Realize that changing one number could effect more > than one thing, and putting in a wrong number, or a typo, could make it > unflyable. I tried that first, and I get a flyable aircraft. But its performance data does not match the real bird. So I dropped this approach. > Sounds like you're not getting enough power. The engine and > prop configs in JSBSim can be tricky. The Aeromatic prop solver isn't > very good, and I'm waiting to put in a better one, so you might not get > good thrust figures if you use Aeromatic's prop. Tell me the engine power > and prop diameter and I'll send you a prop config for JSBSim. The Engine is a TSIO360EB, that is a supercharged engine with 200hp at 2575rpm at sea-level and 215hp at 2575rpm at 12000ft. It has a wastegate at 42inches MP and max. T/O power is at 40inch MP. My JSB engine file looks like this: <FG_PISTON NAME="TSIO360EB"> MINMP 6.5 MAXMP 28.5 DISPLACEMENT 360.0 MAXHP 215.0 CYCLES 2.0 IDLERPM 800.0 MAXTHROTTLE 1.0 MINTHROTTLE 0.2 NUMBOOSTSPEEDS 1 BOOSTOVERRIDE 0 RATEDBOOST1 9 RATEDALTITUDE1 12000 RATEDPOWER1 215 RATEDRPM1 2575 </FG_PISTON>
And the propfile is from aeromatic for a variable pitch with diameter of 76inches, 2 blades. Props are counterrotating. A better prop-file is highly appreciated. At T/O power (40"MP max RPM, mixture rich at SL), when I look at the properties of the engines - and Yes: both engines are running ;-) - each engine runs at 2575rpm, fuel flow is 17gph (which should be more, it is more than 25 in the real world), thrust_lb is 565 and the thruster/torque is -330/+330 for L/R engine. compared to the c172p, at full power on ground thrust_lb is 325 and thruster/torque is 280 at 2180rpm. When i remember correctly, power = RPM * torque * 2 *PI. If I use this for the c172p and my engine, my power is 1.3 times higher than the 172's. Since it has 160hp it looks like the developed power is ok (160 * 1.3 = 208). My thrust is 1.7 times higher than the cessna's, probably due tue the variable pitch prop. So my intention tells me the engines/props are working fine and the propblem is in the aerodynamic section. I will dig into this and keep you informed. More to come Torsten ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel