Dago Red
I run a 13X11 APC pattern prop on my Saito 80 on the WM P51 and it goes about 85-90mph easy.... probably around 100-110 when leaned out, but I usually run it 3-400 rpm rich... It doesn't have flaps, but those are easy to install..... but that's EXTRA weight... less speed!!! Lighter is better. I havn't weighed it... but it's probably around 5lbs.. closer to 6 with fuel... I used micro servos all around for weight, and they have some good response.
also i am at 5,000 feet