on the risk to open up an existing thread:

I'm in the position to choose for a prop on my IV Speedster 912UL. It will be an Ivoprop Quick adjust, but: which size?
I followed the threads on this marvelous community concerning sizes of IVO IFA's, but does that go for the QA's as well?
My doubt is - should I go for the 70 or the 68"?
What do you guys fly with? Any comment highly appreciated!!