Comment by Jonathan M on March 7, 2012 at 2:04pm

Cool!  I have done similar with my eagletree.  What's the weight of your quad.  You may be interested in this data.. CP and CT curves for the APC 11x4.7 SF from a windtunnel  http://www.ae.illinois.edu/m-selig/props/propDB.html.  I have been meaning to do more testing, but my thrust stand needs fixing and so does the v2.4.1 firmware :)

Moderator Comment by Graham Dyer on March 7, 2012 at 10:35pm

Quad weighs 1.3kg, flying v2.5 Alpha, what is CP and CT on those graphs?

Comment by Jonathan M on March 7, 2012 at 11:04pm

1.3kg Nice! right around my weight, I will have to do some more flights with my eagletree for comparison. I am also flying 11x4.7 props.

CT and CP are non-dimensional coefficiecnts for thrust and power (similiar to CL and CD).  It's generally how you gauge the performance of props. http://www.mh-aerotools.de/airfoils/propuls3.htm is a better explanation

Did you grab v2.5alpha from GIT or is there a zip floating around? 

Developer Comment by Marco Robustini on March 8, 2012 at 3:57am

Graham, i've same triblade props but i tried and have poor trust, i use now 10x4.5 EPP on my X525.

Moderator Comment by Graham Dyer on March 8, 2012 at 4:09am

The 3 blade props have been fine for me (once balanced) but have had two in-flight breakages with 10x4.5's from GoodLuckBuy so advise to avoid those at all costs. The APC SF props are good as are the E-flite SF props.

Developer Comment by Marco Robustini on March 8, 2012 at 4:47am

Nice, i use 10x4.5 Mikrokopter EPP or GAUI.

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