Might be the best second plane in the world, I'm still not convinced.

I usually recommend a Great Planes Super Sportster as a second plane, and recently bought a 4 Star 40 so that I could make realistic comparisons. I like the 4* a lot, and in some ways it may be a better second plane, but the Sportster is better in other ways.

The Sportster is a bit quicker, tracks straighter in level flight as well as in most manuevers. Probably due to a slightly higher wing loading and a more efficient design (less drag). The Sportster needs a bit more attention when landing however.

The 4* flys a bit slower due to higher drag, and feels "lighter" in the air (which it is). It also does not penetrate wind as well as the Sportster (tends to get bounced around more), but is a bit more forgiving of mistakes in the air. The 4* floats forever when trying to land (even with the wing clipped shorter by the removal of one bay on each wing). Whether or not that's a good thing depends on your style of flying. (I can slow the Sportster down so that the landing speed is equal with either plane, but the 4* requires a longer, flatter approach to slow down.)

I guess generally, the 4* is a bit easier to land because you have a lot more time to set it up, but I prefer the landing characteristics of the Sportster.

As I said, the 4* MAY be a better second plane, but I'm still not convinced.

Of the two you mentioned, I'd suggest the Kaos. I had one years ago (before the rights were bought by Tower), and it flys where you point it. It was originally a Pattern design meant for clean, smooth aerobatic manuevers and has a relatively long tail moment, so it will track stright through most flight attitudes. The Uproar on the other hand is meant for "fun fly" type aerobatics so it will tend to be "twitchy" in the air. Very fast rolls, turns and loops, which is not ideal for a second plane. (It will bite you in a mistake much quicker than the other three.)

I'd suggest looking at the Sportster and the 4* in addition to the Kaos. I prefer the looks of the Sportster first, then the 4* and the Kaos the least, but that's just personal taste.

Good luck with whatever you choose!
Dennis-

(edited for spelling)