KV Question
- Thread starter rwilabee
- Start date
gtranquilla
RadioActive
Have you tried using eCalc for Multirotors? There are so many factors to take into account including the AUW......
Either would work, the 600s would be a better choice for 4 cells. If you go for 3 cells, the 800s would be best. Would work well for an AUW of 3.5 to about 6 pounds or so.
According the mfg of the motor (AKE) the (600KV 3508)would work well with a 14" prop on 4S. I have an XAircraft 650 Pro Quad with Camera Gimble that I was thinking about using the 600 on. Would this cause any kind of instability. I'm planning to use my Naza but could switch to my WKM. They claim that for the 800KV 3508 that 11" props work best.
Rich
gtranquilla
RadioActive
Would this cause any kind of instability? ECalc won't be able to assess that. But I built a custom 800mm Hex awhile ago and the 1st set of motors spinning 14 inch props were a bit undersized...... Why? Because the WooKong controller Basic and Attitude tuning parameters could not be optimized to eliminate MR wobble during normal flight......stable as a rock in still air but constantly wobbling when the MR was flying in the slightest breeze........ I think it has something to do with the length of the MR motor arms and the amount of spare torque available to enable the MR to respond fast enough for the PID controllers to do their intended job in a timely manner.
sixshooterstang
Bird's Eyes Aerial Media
what motors are you looking at? link us
So in the case of using my Naza or WooKong Controller does that mean I would need to turn the gains up higher to try and get less wobble due to the PID controllers.
Rich
I run 12s on a 585 with 750Kv, and yes, there is some kiting, but the run time is worth it.
sixshooterstang
Bird's Eyes Aerial Media
seems a 12inch prop and the 600kv would be a good combo for 4s lipo. I am running 4s, 850kv motor and 12s and the copter is overpowered with 4 rotors. and an AUW of ~2.6kg
sixshooterstang
Bird's Eyes Aerial Media
The ecalc prop calculator says 14s are too big for 4s. 13s should be fine it says. Will only draw 19A which is 3 less than the maximum of 21A so it will get a little warm.
Apc slofly 13x4.7 @maximum ~1.4kg thrust per motor @ 19A
apc slofly 12x3.8 @maximum ~1kg thrust per motor @ 12A
12s would keep you nice and cool and if youre running a hex you can have an AUW of up to about 2.2kg and with 13s you could have an AUW of about 3kg to maintain proper hover throttle.
Apc slofly 13x4.7 @maximum ~1.4kg thrust per motor @ 19A
apc slofly 12x3.8 @maximum ~1kg thrust per motor @ 12A
12s would keep you nice and cool and if youre running a hex you can have an AUW of up to about 2.2kg and with 13s you could have an AUW of about 3kg to maintain proper hover throttle.
What voltage does it show for 14" props, just curious.
sixshooterstang
Bird's Eyes Aerial Media
forgot to note that part. plugged it in as a 4s lipo at nominal voltage however
Does it say what voltage if running 14" props would work.
Not directly, but it works out that way. Kv = motor RPM per volt. Given that props on multis typically turn in the 5-8 thousand range for peak efficiency, bada-bing, there's your Kv for a given pack voltage give or take some.