Posts: 5,314 Threads: 672 Likes Received: 3,155 in 1,743 posts Likes Given: 2,027 Joined: Jan 2016 Reputation: 139 26-Nov-2017, 07:54 PM (This post was last modified: 26-Nov-2017, 07:54 PM by Oscar.) 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. It's amazing what the flight controller can do! Posts: 236 Threads: 2 Likes Received: 66 in 45 posts Likes Given: 27 Joined: Jan 2016 Reputation: 17 It's flight controller's primary job, why you're surprised? Posts: 3,288 Threads: 129 Likes Received: 2,740 in 1,644 posts Likes Given: 2,969 Joined: Apr 2017 Reputation: 65 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 OMG, no one told me it would be this much fun! Addicted :) Posts: 5,314 Threads: 672 Likes Received: 3,155 in 1,743 posts Likes Given: 2,027 Joined: Jan 2016 Reputation: 139 26-Nov-2017, 11:49 PM (This post was last modified: 26-Nov-2017, 11:50 PM by Oscar.) (26-Nov-2017, 09:47 PM)AndreyM Wrote: It's flight controller's primary job, why you're surprised? god, you do talk and sound like a programmer LOL What i mean is it performed better than I expected, okay? Try an old FC like the KK2, and it won't work that well, not even a slightly bent prop! • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 While it's not surprising that it works (if you think like a programmer like me or Andrey ), 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. Posts: 1,504 Threads: 83 Likes Received: 944 in 654 posts Likes Given: 2,142 Joined: Sep 2016 Reputation: 24 Betaflight error reporting, what a great idea! Windless fields and smokeless builds Posts: 236 Threads: 2 Likes Received: 66 in 45 posts Likes Given: 27 Joined: Jan 2016 Reputation: 17 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 :-) • Posts: 5,314 Threads: 672 Likes Received: 3,155 in 1,743 posts Likes Given: 2,027 Joined: Jan 2016 Reputation: 139 27-Nov-2017, 09:33 PM (This post was last modified: 27-Nov-2017, 09:34 PM by Oscar.) 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 Posts: 1,290 Threads: 67 Likes Received: 711 in 472 posts Likes Given: 1,216 Joined: Mar 2016 Reputation: 23 Sooooooo.......the moral of the story here is that we can put any old prop on any motor at any time????? 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!!!" Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 (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????? 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! Posts: 1,290 Threads: 67 Likes Received: 711 in 472 posts Likes Given: 1,216 Joined: Mar 2016 Reputation: 23 (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!!!" • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 (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... Posts: 43 Threads: 8 Likes Received: 55 in 22 posts Likes Given: 3 Joined: Sep 2017 Reputation: 3 The video from that day Posts: 5,314 Threads: 672 Likes Received: 3,155 in 1,743 posts Likes Given: 2,027 Joined: Jan 2016 Reputation: 139 too bad both of my quads went down early! • |