I sure don't see where what I said is out of sync with what is used for 3D on 50 size gassers .
On your 12x4 - it turns up faster than a 10x8-- a lot faster - unless you have some props I have never seen. At least on the OS 46 etc..
My point was to not load the engine for 3D -rather - let it run up I presume you have a DA 50 and other engines in this size and have experimented with props.
But - hey -I don't expect you to agree with my ideas - I simply wrote about what I found to work on the 40/50 gas engines .
Maybe Dave at DA disagrees with what I said - why don't you ask him?