Hi,
Almost 1 year ago I started a topic on the diydrons forum in wich I asked on how much efficiency loss I will have on converting my quad to an X8. Almost no reaction to my question. Nobody could give some figures wich I could use for my calculations. The only helpfull answer I got was from somebody who said that the efficiency loss depends on prop size and distance between the props.
Time has past, other projects are closed so I'm starting with the build of a Y6 multirotor. And the first thing before building the frame is a thrust test of 2 motors in sequence. Result is a 10% efficiency loss. See full graph and info on my blog at http://wipo-y6copter.blogspot.be/
This figurs can by handy for everyone who is building Y6/X8 copters. Currently I'm building the frame, but I will try to post more efficiency loss tests for other prop sizes asap.
Comments
very interesting. you should do similar test for 2 blades vs 3 blades on a prop.
I'm not a copter guy (yet) but I was thinking today out of idle curiosity, "two props on top of each other such as the Y6 surely can't work as hard as two props in free air". What fortuitous timing!
Thanks for the look here Wim! Do you have plans to try and 10x4.7 on one side and an 11x4.7 on the other? We found we could get it down to the 8% range with that setup. Great data!
JC
This is very cool! Thanks for sharing your research.
You note on your blog that the efficiency loss is an "acceptable result." Do you mean this is an acceptable trade-off for the stability you gain with the setup, or is there some other benefit?
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