Nate: Which STOL kit is on 79M? How much does it help you when operating out of KAPA?
Robertson.
It makes my wallet lighter to the tune of $900 for a half a set of aileron hinges to replace one side this year. That must account for a significant reduction in useful load.
The joys of STCs!
Honestly, it doesn't help at all at APA. The shortest runway is 4800'.
It takes a butt-puckeringly short runway or need to get off the ground (beating the airplane up in gravel, for example) to make it actually useful, and even then the additional drag means you lose obstacle-clearing ability. You're too slow to climb.
For me it does two things: It's fun. And it improves low speed handling. Maybe a far distant but important third, it could allow for a slower impact with things in the case of an engine out over inhospitable terrain.
The YouTube video below is what it will do at Gaston's closer to sea level. DW was kind enough to film a takeoff. He'd been getting off easily by the windsock with his STOL 172 and I felt like giving it a shot. I had about 55-60 gallons on board (we have long range tanks also, which are usually equally useless... I don't need five+ hour legs but it's nice for safety margin) and tossed everything else but me, the iPad, and the headset out in the grass before taxiing.
My technique is somewhat sloppy (tail bobbing courtesy of ham-fisted elevator control attempting to make sure the bumps in the grass there wouldn't cause a tail-strike), but it comes off pretty quick at that altitude.
Note that once off, it's not climbing. This is the thing that surprises most with STOL. You need to accelerate to lose all the drag of a Flap 30 takeoff. Then you can start to retract to 20 and at Gaston's altitude on a hot day, climb. Up here on a hot day, climb real shallow and keep accelerating to Vx or Vy depending on obstacles. I'm just fast enough to start retracting as the clip ends.
I also lifted off at least five knots above the speed Robertson says it'll fly at. In fact, I was planning another attempt and didn't think it had come off prior to the windsock, until the peanut gallery let me know it had via the Unicom. I'm not used to how well it'll scoot at sea level, and the additional power the O-470 puts out down there so I wasn't pushing it. Was meant to just get a feel for what it was willing to do at that altitude.
It's usefulness is really in getting the wheels up and off of unimproved runways if you have room to speed up and climb afterward. It'll also land and stop in spaces it can't get back out of, which is less useful. I've used it on some gravel runways to stop throwing crap into the prop and tail, as does one of the co- owners when he goes to South Dakota. (We always kid with him that the prop needs dressing after every one of his trips. Ha. He needs to roll forward after applying power.)
A few who've flown her and have considerable 182 time say the ailerons remain more effective, slower. Usually described as a "solid" aileron feel, even in the flare and touchdown phases of a landing. I agree but I'm used to it after 200+ hours in her.
The other interesting side-effect is the noise the stall fences on top of the wing make as they start to block more and more span-wise flow. I describe it as "singing", a metal vibration that's very high pitched and starts a bit before the stall horn and gets progressively louder the closer to the stall you get.
Power off, it doesn't really stall for long. It bobs the nose up and down. You can clamp the elevator aft with both arms and maintain straight and mostly level with massive rudder inputs and just bob down at rates between 1000-2500' per minute. Power on, it'll stall and shudder without a violent break, and recovery can be made back to controlled slow flight with just relaxing back pressure with the stall horn blaring the whole time. (Bad habit to do that for muscle memory and as a general procedure, but fun to purposefully demonstrate.) It'll also usually try to roll to the left from all the torque, p-factor, etc... Slowly. The ailerons are still effective but getting too wild with them is tempting fate and a spin.
Anyway, the video. It counts as a photo too, I guess!
http://youtu.be/D01jHXn2q28