Oh, man; don't tell me that. I too have been looking for the "ideal YS 63 prop, and just ordered an APC 14x4W. Since they don't list any other 14x4 (that I can see, anyway), I'm assuming that's what you have.

The best prop I have tried so far (on a SIG Somethin' Extra) is the Top Flite 14x5 wood. The 13x6 APC Sport (skinny blades) pulled the model too fast for my tastes, but did work well. I broke the 14x5 on a sloppy landing, and am now using a 13x6 DynaThrust nylon propellor. The day I tried it was extremely windy, so I don't know yet just how it does in normal conditions.

If the 14x4W doesn't work out, I'll probably go with the 14x5 Top Flite. That one did real well; the wide blade chord slows the model down to a crawl, yet has plenty of thrust for vertical stuff.

I have been unable to locate any other 14x5 props of any kind.

Steve