Attachment 12023
This was allegedly a carbon cub modified to take P-STOL's but there isn't much information about it. I found it on this thread over at SC.org
https://www.supercub.org/forum/showt...131#post804131
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I've flown P-STOL kitted PA-18's vs Non P-STOL kitted PA-18's back to back and couldn't really tell a huge difference. Maybe someone with thousands of hours in the type could. I kind of preferred the stock flaps and bungess to the P-STOL and AOSS equipped PA-18's I flew. Granted, the fact that they were on 35's probably negated any suspension differences.
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I couldn't really get the FX3 I flew for 15 hours (same one you trained in I think, hawgdrvr) to do a real power off stall. Some nose heavy cessnas (182's) behave the same way. At the published stall speed, with power off, the elevator loses authority and the nose just drops down to a roughly level pitch attitude even when you hold full aft stick with a lot of nose up trim, whether flaps or up or down. I don't really feel like you really achieve the critical AOA of the wing when you demonstrate a power off stall in the carbon cub.
Kris mentioned that the number in the AFM was based on a power-off stall. I think the higher flaps down power-off stall speed number in the AFM can be attributed to this behavior (elevator stops working at a higher airspeed when power off with flaps down vs power-off with up) plus maybe a little bit of indicated airspeed error vs calibrated airspeed that is more prevalent at the higher AOA with flaps up. Perhaps the flaps block some airflow to the tail when power off but prop blast with power on negates that effect? Just speculating.
With power on, it doesn't seem to stall until less than 20 MPH IAS, with full flaps, and that's at max gross weight....but when it does stall with power, it can be pretty abrupt, and drops a wing quick if you aren't well coordinated. Then again, that's with me flying, and I'm very average, at best, behind a cub.
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At the factory, it was mentioned that some people are ordering FX's with carbon cub SS flaps, because apparently the SS flaps deflect to a higher angle. I don't know the differences otherwise.
In regard to the P-STOL's, there is some more info about them in the linked thread in terms of what Backcountry and Mackey are doing, etc.
I don't see P-STOL's on Toby Ashley's sarge or Butch Kingston's EX. They are running slats of course for the pure STOL contests, though (but interestingly not the STOL drags). With that said, I'm sure there are so many mods going on with those that they're no more a stock carbon cub than Toyota's NASCAR team's car is a stock Camry.