Managed to get a better fly by pic today at the field.
And here is a vid with the 3.3 x 3.15 prop using a perfect brand tin tank no pressure tap.
Average good passes at 25.4k and 26.557K rpm on the best pass theoretical speed 79.22 mph
https://www.youtube.com/watch?v=ZM2cn0mdHx4&feature=youtu.be