Volts, Current & Watts with 9x5 3-blade and 11x4.7 2-blade props.

Superimposed volt/current graphs - 9x5 3-blade in red and 11x4.7 2-blade in blue

Further to my informal testing of 3S and 4S batteries with the same prop I did a test with 9x5 3-blade props (http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5248) and 11x4.7 2-blade props (APC SF 11x4.7).

Test procedure: using freshly charged batteries I took off and hovered at ~2m for 60 secs and then landed.

Quad specs:

APM2

KDA20-22L motors from Hobbyking

2 x Super Simple 25-30A ESC's from Hobbyking

2 x Hexfet 25A ESC's from Hobbyking (2 of 4 were DOA)

3S 3000mAh Turnigy 25C

X525 frame

Average values:

9x5

Va - 11.75V, Pa - 161.6W, Aa - 13.8A

11x4.7

Va - 11.89V, Pa - 150.2W, Aa - 12.7A

11x4.7 uses ~11W less power and ~1.1A less current on average for the 60 second flight than the 9x5

Full graphs below: 9x5 first.

11x4.7

You need to be a member of diydrones to add comments!

Developer

Marco Robustini March 8, 2012 at 3:47am

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

Graham Dyer March 8, 2012 at 3:09am

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

Marco Robustini March 8, 2012 at 2:57am

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

Graham Dyer March 7, 2012 at 9:35pm

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

This reply was deleted.