RE: 3 blade prop on your hare?
A 3 blade prop cuts noise and it cutss thrust doen too. The model will be faster, but you WILL loose braking in a downline as the disk is smaller and it WILL NOT come out of a hover near as well.
I have a DA 50 and Da will tell you their official reccomendation is a 22x10 for sequence flying and a 24x8 for down on the deck 3D and a 23.8 for a good balance of both. I run a Mejzlik 23x8. It does just as they say. I like 3 Blades and I have a Mejzlik 21x11.5 Narrow 3 Blade Mejzlik and it is what DA says the DA 50 likes. It turns almost identical to a 23x8 2 blade and my Edge is a little faster, but doe not come out of a hover NEAR as well. Not NEAR as well. I took it off as a Edge is no sequence plane anyway. I love the 3 blade for a Extra 330L. A 2 blade or a 3 is simply a matter of what you want to do. IMAC sequence flying it is preferred. 3D is is not.
My Mejzlik 23x8 is perfectly quiet anyway so noise is no issue.
Norman Ross Jr.