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Flying with different propellers on a quad
#1
Gianpa tried flying 2 different types of props on his quad today

5040x3 on one side and 5046 on the other... he couldn't feel a damn difference compared to using the same props. Big Grin 
It's amazing what the flight controller can do!


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#2
It's flight controller's primary job, why you're surprised? Smile
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#3
It would make the motors with the lower lift generation ability work harder to try and compensate, but the FC is fast enough you would not likely realize it was happening. Just my feeling on it.
SoCal Kaity :D
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#4
(26-Nov-2017, 09:47 PM)AndreyM Wrote: It's flight controller's primary job, why you're surprised? Smile

god, you do talk and sound like a programmer LOL  Tongue
What i mean is it performed better than I expected, okay?  Rolleyes

Try an old FC like the KK2, and it won't work that well, not even a slightly bent prop!
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#5
While it's not surprising that it works (if you think like a programmer like me or Andrey Wink), it's an interesting illustration of what the flight controller can cope with.

I'm sure the flight controller can see that there's a persistent imbalance in the quad. Maybe it should be making a note of this so that next time you connect to the configurator, it could warn you that it can see a problem with the quad's propulsion system?

It might not be useful to warn about an imbalance where the rear motors work harder than the front motors (as many quads show that pattern), but a side to side or corner to corner imbalance is most likely due to a problem that you'd want to fix.
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#6
Betaflight error reporting, what a great idea!
Windless fields and smokeless builds
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#7
Quote:Try an old FC like the KK2, and it won't work that well, not even a slightly bent prop!
It wasn't complete in mathematical sense, nor is current FC software, but it's closer to being complete :-)
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#8
Andrey and unseen, you guys remind me of Jordan Schlansky from the Conan O'Brien show.

"I love this coffee machine so much, it's amazing!"
"Coffee machines are meant to make coffee, why are you surprised?"

LOL Big Grin
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#9
Sooooooo.......the moral of the story here is that we can put any old prop on any motor at any time????? ROFL ROFL ROFL Wow.....it just got cheaper to fly!!  I suspect though if you were to push the machine to it's limits you might find that the FC might compensated so well due the different thrust characteristics of different props at a given RPM?  yes, no, maybe??
"Damn the torpedoes!!!  Full speed ahead!!!"
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#10
(27-Nov-2017, 09:41 PM)sirdude Wrote: Sooooooo.......the moral of the story here is that we can put any old prop on any motor at any time????? ROFL ROFL ROFL Wow.....it just got cheaper to fly!!  I suspect though if you were to push the machine to it's limits you might find that the FC might compensated so well due the different thrust characteristics of different props at a given RPM?  yes, no, maybe??

Nah, you'll just run out of control margin.

If the flight controller is already maxing out some of the motors to compensate, there's nothing left to actually change direction!
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#11
(27-Nov-2017, 10:16 PM)unseen Wrote: Nah, you'll just run out of control margin.

If the flight controller is already maxing out some of the motors to compensate, there's nothing left to actually change direction!
So in other words and to over simplify the issue, one would be limiting the quad's performance to the prop that developed the least amount of thrust at that motor's max rpm?
"Damn the torpedoes!!!  Full speed ahead!!!"
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#12
(27-Nov-2017, 11:01 PM)sirdude Wrote: So in other words and to over simplify the issue, one would be limiting the quad's performance to the prop that developed the least amount of thrust at that motor's max rpm?

Exactly.

I guess if you'd log such a flight, it would be visible on i-term as well, which imho could have side effects in rough acro moves. But "normal" flight should be pretty ok.

If i remember correctly Skitzo once built a "frankenquad" with different motors and props on every arm... Big Grin
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#13
The video from that day Big Grin

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#14
too bad both of my quads went down early! Smile
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