I have a report to present to the furm as well as a request for information dealing with the performance of C172SP in Xp11. So far, this aircraft has treated me well, and up until using XP, I wasn't a huge fan of the default Cessna. Now that I've been using it almost all the time now, I've been getting used to how it handles, how it operates through all phases of flight, but last night, something strange happened, that I believe may be beyond a bug, but something not modeled.
Last night, I performed a 2-hour or so flight from KTRM to KSBP. The plan was to visit a couple of other airports that GPB500 has put together (great scenery, btw), and so with that, I loaded up the C172SP, set my airport and position, set the weather to auto download, confirmed the time ans set off. The weather in general, was rather pleasant at KTRM, and during the first 1/3 or so of the flight, I only experienced periods of intense wind, with heavy cloud cover to follow at around 8000 feet.
Somewhere northeast of KSBA, I had to increase altitude to 9000 feet and it was at this time, that I flew into a storm system in the area. The OAT was reading around 34F, but started to decrease rapidly. I was starting to see rain (a first for me in XP11) and the winds were very strong. As the autopilot was struggling to hold my heading, I started to hear the faint stall warning sound and as I glanced down at my pitch indicator, the aircraft was starting to roll to the left. My altimeter was beginning to fall, so I re-checked the autopilot and it was disabled. As I did a quick check of all systems, they showed normal, but I was still losing altitude. I took the controls, applying a firm back pressure on the yolk, to attempt to maintain level flight, but the aircraft was all over the place. I re-checked the OAT and it read 28F, so obviously I was in very cold conditions. Within about 10 minutes time, I did the right thing and dropped my altitude back down to 8000 feet, and during that time, the OAT rose to 34F, the aircraft was a little easier to control, the winds weren't as strong, and I was able to re-engage the autopilot.
It wasn't until this morning, as I thought about that flight again, that I realized that no carb heat control has been modeled in this aircraft. I'd looked for it before, in the past, and recognized there wasn't a control knob for it, so I didn't give it a second thought. I also never flew into a storm system like that before (with a single prop aircraft), but in hidnsight, I believe what happened was that the carb heat would have helped prevent the aircraft from wanting to stall. During that rough patch of weather, my KIAS was around 60 and no matter what I did, i couldn't get the aircraft to speed up, until i was below the flight level i was at.
I've experienced carb heat issues before in another sim, using a different aircraft that had carb heat modeled, so it was a simple mistake to correct as a pilot, but for the C172SP, no carb heat control can be found on her. If carb heat was the issue and the solution, would this be a candidate for a bug report, or is it something I should petition LR to model? I took a look at an old 1978 POH for the Cessna 172N, and I do see it was equipped with a carb heat knob. In fact, under normal procedures, section 4, carb ice can form, and it is recommended to use it, though can cause a richer mixture, so re-adjusting the mixture with carb heat on is tuned manually (trial and error), throughout the flight.
I may have gotten a little long-winded here, but if anyone wants to chime in with thoughts, experiences and recommendations, that's fine. I honestly don't recall anyone reporting the missing carb heat knob in XP11, in fact, I don't remember off hand if the Cessna had it or not in XP10.
In any case, I recovered the aircraft and landed safely at KSBP, where the weather was much more pleasant.
*Shameless plug: please check out GPB500 (Greg) airports and consider the small donation fee he requests, because for what you get it, it is worth every penny. He's always hard at work, perfecting his airports, with new ones planned in the future.