On Sat, 2008-12-13 at 01:18 -0700, John Denker wrote: > On 12/09/2008 05:35 PM, Martin Spott wrote: > > John Denker wrote: > > > >> My point here is that most pilots, especially low-time private > >> pilots, [...] [...] > Changing topics slightly ... if anyone would like have a polite, > fact-based discussion of the c172p, we can give that a try. Using > the c172p model fresh from the rc2 package, I observe: > > release model rpm alt fps <-> fpm ktas kias throttle > rc2 c172p 2711 1048 15.2 913 up 63.3 60.4 1 > rc2 c172p 2714 5641 10.3 618 up 63.3 61.8 1 > rc2 c172p *2738 10364 3.21 *192 up 60.0 59.9 1 > > If anybody thinks these numbers don't indicate a problem, please > explain. The numbers marked with a (*) should raise red flags > even for modelers who have never been near a real C172. Hint: > What's the service ceiling for these critters?
O.k., I stand here as a no-time pilot who doesn't particularly care about the Cessna aircraft in flightgear, but this issue may involve the underlying engine model I do care about, so: John, the onus is on you. If these numbers imply a problem to you tell my why. I am not your student and will not except a research assignment from you. That said, the Type Certificate Data Sheet for the c172p gives a red-line for the engine of 2700 rpm, and Airliners.net has a reference to three different models c172 having service ceilings of 13,100, 15,100 and 15,900 feet. So the fact that it is climbing at 200 fpm at 10,000 feet 40 rpm above red-line for the engine doesn't raise any "red flags" to this modeler. Given the c172p fdm starts at at a light 1944 lbs (vs a max weight of 2400 lbs) and has an engine rated (160 hp) near the 15,900 ft service ceiling model (175 hp) I'd expect a higher climb rate at 10,500 feet than 200 fpm. Thanks, Ron ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
