The stalls aren't that much different, but the way how a plane reacts to the stall seems to be pretty noticeably different, F4UDOA.
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For instance, to repeat the experience I've wrote down in another thread, I decided to test the N1K2 out and met a Bf109F-4. The pilot was koonan, pretty decently managing the 109F, but the N1K2 is simply a hugely advantageous plane against a '42 Bf109F-4.
I fooled around for a bit, decided to just shoot down the 109, and when the F-4 went by me into a semi-vertical spiral climb. I countered it with the timed early hard-turn shi* N1K2 pilots would typically do. The 109 had a bit of speed advantage, but it wasn't by much. According to my AH1 experience, the F-4 was to be just toast.
Well, what happened next surprised me. The Bf109F-4 succeeded in going into a straight 90d vertical. My N1K2 was aiming for the shot, speed was near 100mph, pitch angle was about 50~60degrees upwards. The 109 was 400yards in front of me and the distance between his position on the screen, and my gunsight was shorter than a thumb's length.
Now, if I know how AH1 N1K2s react, all I had to do in that situation was just keep pulling the stick, and it will still nose up perfectly despite of the low speed. I'd get a full 1~2 second of shooting opportunity, shoot the 109 down, and then stall out.
To my surprise, I couldn't get my sights on the 109. The N1K2 refused to respond at that angle and speed. When ever I pulled harder it would start wobbling sideways indicating an imminent stall. A mere thumb's length in the screen and I couldn't close that gap, in a N1K2!
After the fight I asked koonan what his 109 was - I thought it was a G-10 for sure. He said it was a F-4, and he had to pop out full flaps to get his plane to suspend itself momentarily in the air. He himself said he was surprised - he said that in AH1, in such desperate situation usually he's nailed right out of the sky in N1K2s, and didn't think he'd survive that encounter either.
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I think it means, the burden of low speeds weighs much heavier than how it was in AH1 - in AH1, as long as your plane had the ability to manage high AoA maneuvers, low speed didn't matter much. A Spit or a N1K2 or Hurricane would just pull its nose upwards in a stable manner to achieve shooting angle no matter what speed it was in, as long as it was higher than the stall speed. I think that's a bit changed in AH2.