ORIGINAL: fadi81
I used to run my OS 46AX at 13600rpm with the 10x6... I killed the engine after a while
Note that in the catalog they specify a theoretical range up to 17000rpm with a power peak at 16000rpm (never happens in real life)
I bought another one, installed the 11x5 and 11x6 and event went up to the 11x7 then 11x8; and finally tried the 12x4 on 3D planes
They all run differently, but I feel you get the best out of this engine with the 11x5, 11x6 and 12x4. It depends on what you need.
After all, the manufacturer, for breakin, I think, should be recommending the ideal prop in its manuals
I use the 46AX on my race T34's and I run 9.5x6 APC at upto 17200, 9.5x7 Bolly at 15000 and 10x5 APC at 16500, the fast one is the bolly, the engines in these planes have been know to last for 2 or 3 years, or 1 year and then make a great sport engine. We run them at the limit, but I know one of the guys put a 46AX on a skyraider mk2, to make sure he did not rip that plane open he used a 12x4N, he says it is real slow but great pulling power, for a beginner that would be the best way to go big low pitch prop. Also get some good after run oil, I use
http://myrcsupply.net/index.php?main...ed377e446ebc17 and it is great it will look after the engine well if you take the higher RPM option.
Also in another post this engine on a small prop my plane will take off across the runway at my field with is about 65ft.