Guys, you need to read the posts a bit closer... NOBODY SAID FLYING WITH A FOUR BLADE PROP "COULDNT" BE DONE! What has been stated, and is a FACT, is that a four blade prop of "scale" size for a Mustang, Corsair, etc, would be too big for most R/C engines to pull without damaging the engine. Flak, you and Killroy are talking about running four blade props that are 4 to 5 inches smaller in diameter than they would be if they were actual scale size for the planes you are putting them on. Of course they will work when they are that much smaller, and I will agree they look 100 times better on a warbird. What these guys are trying to tell you is that in order to be of scale size in proportion to the aircraft, the prop would be too much for the engine, without a reduction drive of some sort (like the Byron units of a few years back). No one is trying to tell you that a four blade prop cant be used at all.