ORIGINAL: w8ye
The 17X8 and 18 X 6 are the correct props
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Not to be argumentative (who me?), but my ST G2300 handles the 18x8 with ease and its a 1.40 two-stroke, as everyone knows.
I'll have to mount up my Saito 1.80 and run comparisons between the 18x8 and other prop sizes that have been mentioned here. Of course, it depends upon the airplane that one is flying too, as to whether a propeller is suitable or not.
Ed Cregger