Yes DH, I also have observed that the Mejzlik 27x10 and 28x10 are about the same load. I've been running the 27x10 for several years on a 3W-100 in a 33% Edge. Performance is excellent despite a heavy airframe (29 lb). Friends who run the 28x10 prop, get about the same static rpm with the 3W-100. I would imagine that the 28 inch prop has more flywheel effect, but that's just a guess. I wouldn't use either of these props for 3D, but they're great for sequence flying.