Andy Ross said: > Lee Elliott wrote: > > Production Typhoons could exceed 530 mph in dives, with bombs/RPs, and > > Tempests could overhaul V1s. I thought the Sea Fury was even faster, > > but I don't have a figure off-hand. > > The key words being "in dives". The solver values are specified in > level flight. And dives can matter a lot! Given the numbers and > weights in the current configuration, the Mustang is getting around > ~850 lbs of thrust in cruise. At its specified cruise weight of ~8000 > lbs, it can double (!) its effective thrust thrust simply by entering > a 5 degree dive. > > Thus my question about the configuration for the performance figure. > I'd be happier believing it if we could confirm that it was with a > stripped aircraft. The guns, radios, emergency equipment and fuel > could easily add up to 20% of the weight or so, which would reduce the > induced drag to 64% of its current value. >
Does this help? http://www.geocities.com/copeab/Vehicles/P51D_Mustang.htm The WWII Hawkers were out performed by the P51D at least in terms of speed and ceiling. I'm not sure about the Sea Fury but if it was faster it was likely by a tiny margin. This shows 437 mph @ 25,000ft: http://www.spiderbark.com/fgfs/3-View-sq-sign-MIA.jpg Again I'm not an expert (obviously:-)), but it seems to me that these top speeds were supposed to be lower at lower altitudes. My semi-educated guess is yes it could do the 380kts/437mph, perhaps with fair bit of variation due to weather conditions, aircraft condition, and pilot skill, not to mention payload effect which is quoted in the above link. At least I haven't heard of anything to contradict this very commonly quoted specification. No doubt it could cruise mightily at well over 25,000ft so our model should be able to that anyway. Here are some more authoritative sources for data that were used. Others might be listed in the p51d.xml file. Maybe someone who understood what they were looking at could figure out why an aircraft can be made to go so fast by piecing together the clues in this data: http://www.spiderbark.com/fgfs/51SS.gif http://www.spiderbark.com/fgfs/51SSL.gif http://www.spiderbark.com/fgfs/51OLL.gif http://www.spiderbark.com/fgfs/51INSTR.gif http://www.spiderbark.com/fgfs/51INSTL.gif http://www.spiderbark.com/fgfs/51FQD.gif http://www.spiderbark.com/fgfs/sec1_0001.JPG http://www.spiderbark.com/fgfs/sec1_0001a.JPG http://www.spiderbark.com/fgfs/sec1_0002.JPG http://www.spiderbark.com/fgfs/sec1_0003.JPG http://www.spiderbark.com/fgfs/sec1_0004.JPG http://www.spiderbark.com/fgfs/sec1_0004a.JPG http://www.spiderbark.com/fgfs/sec1_0005.JPG Please save these to your local system as they will not remain online long. In the meanwhile I'll be contacting the Gunfighter folks to get the pilot's opinion on this. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
