I have been running my DA100 with the MSC line of props...I have invested in excess of 700.00 dollars in the search for a quiet and cost effective prop.
I use the MSC line of two blade woodrops .
The 27-10 is good for a low time engine and the 28-10 will work when the engine has about 12 gallons thru it or when it begins to get loud with the 27-10.
If noise is not an issue in your area then the 28-10 Mejlik works OK...but why spend the extra money when you dont have to.
I use the MSC props on ALL my giant scale engines and finsd them to work well.From 3W106 to 3W140 the MSC line has proven itself to me .
If price doesnt matter then try the Fuchs line of props from Aircraft International or the PAC line of props from TNT .
I can afford these props but I find the MSC line does it as well for less.
Mike S