Yes flights on the last two vids was done with the 4.2x4 however last night I took the prop off
and put back the carbon 4.75x4.75EC I want to use the data logger to check the speed.
I have on order some 4.75x4.2E to use for 27k + running. The engine wont be pushed as
hard as with the thicker airfoil from the 4.75x4 1/2A prop. Pipe is doing its best work at
above 27k to 29k per the readings / engine heat and ease of the needle settings.
The 4.75x4.75 in the summer is pushing the engine to a richer run. I think this time of year
the engine is going to do its best with it. The 4.75x4.2E might be a good all around prop
in the summer.