Yes I have read that too Alan, the carbon 4.75x4.75 could do well with the Norvel .074 and TD .09 however
the AP .09 with the Russian pipe thus far shines best with the APC
4.75 x 5.5E / 22.24 static / 116 mph
CL line loading vs RC at speed vs overall weight of plane type makes cross pollination of that
prop possible. I was curious what the prop can handle in actual use so I found this..
5s Viper getting near 200 mph with the standard grey 4.75x4.75 more than double the watts
the .07 Vertigo can generate. If you can keep the weight down larger size engine could be used.
Static 54,000 rpm / good size plane suggests its over 18oz of dead weight load on the prop.
https://www.youtube.com/watch?v=1DuTI7UvkK0