biggles uk
Member
I am researching prop choice for an Octocopter. My motors are going to be 4014-320KV Turnigy Multistar on a 6 cell. I have set up a test rig so that I can programme my transmitter on a switch so that the particular prop produces the 875g of thrust I need to hover, I have then run that for 1 minute and here are the results.
15 x 4.5 turnigy wooden prop (1 min burned 61 mah) at 3.7amps and 91 watts
14 x 4.5 turnigy wooden prop (1 min burned 66 mah) at 4.2amps and 102 watts
14 x 8 Graupner e prop (1 min burned 76 mah) at 4.6amps and 114 watts
Now this is how I interperate these results.
mah/ min at 875g x 8 (motors) = mah/ min for Octocopter to hover
so for the 15" props
61 x 8 = 488mah / min to hover
if I have 10000 mah to burn then that gives me 20.5 mins hover time. (I know thats only theoretical and that flying uses more)
To me the 15 " prop is a no brainer choice but am I missing anything when it comes to advantages of smaller props
15 x 4.5 turnigy wooden prop (1 min burned 61 mah) at 3.7amps and 91 watts
14 x 4.5 turnigy wooden prop (1 min burned 66 mah) at 4.2amps and 102 watts
14 x 8 Graupner e prop (1 min burned 76 mah) at 4.6amps and 114 watts
Now this is how I interperate these results.
mah/ min at 875g x 8 (motors) = mah/ min for Octocopter to hover
so for the 15" props
61 x 8 = 488mah / min to hover
if I have 10000 mah to burn then that gives me 20.5 mins hover time. (I know thats only theoretical and that flying uses more)
To me the 15 " prop is a no brainer choice but am I missing anything when it comes to advantages of smaller props