I had some Iflight 1404 3000kv motors in a 2.5 cinewhoop that wasnt being used any longer. I swapped the motors out and used them in a new Huricane 2.0 build. I figured they might be a bit big but decided to give it a try. The result was the exact opposite of what I thought would happen. Instead of being overpowered my throttle is at 70% just to get in the air and slow cruise. I flashed the newest betaflight firmware. Checked ESC firmware, I'm on blheli32.9. The settings etc seem to be fine in the configurator. I try another test flight with no luck its still doing the same thing. I try a different quad with the RC, no issues. I am on default betaflight settings and yet the cinewhoop is acting like I have a motor limit on it. I am using a Hakrc f722 45amp AIO. The quad flies horribly, bad shaking like something is out of balance until I load a UAV cinewhoop tune. The cinewhoop flies just fine with the tune but stuck needing 70% throttle. I have a few buillds under my belt, never have I needed to load a preset to get the quad to fly nice. I recall the 3000kv motors being very smooth but zero punch. I don't believe the previous build for the motors had the same issue but hadn't flown that quad in sometime. 
Any ideas what might be going on here? 

Thanks

You say your motors are 3000kv, and the Hurricane 2.0 is that a 2" cinewhoop? For such low kv you may need the higher voltage of 6S to get the motors to spin at the right speed, but not sure the 1404s are rated for 6S. If you intend to fly 4S, I believe something in the 5000+kv range would be more suitable for the 2" prop.

As far as vibrations and tuning... I just put together a XI20 2" cinewhoop build and also getting a lot of vibrations. The motors all spin up slowly so not sure if there is just too much resonance with the whoop guards, or the larger motors on the tiny prop, or what is going on... still have to work on it some more.

Thanks for the reply. Yes the Huricane is cinewhoop, I have the 2.0. I was thinking the same thing with the 6s batteries. Unfortunately according to iflight website they are 3s/4s for the series Xing2 1404 KV: 3000,3800,4600. I am running 4s 850hv GNB. I remember the motors being slow but smooth. I don't believe the previous setup for the motors had the same throttle issue but not certain. I checked the rates and the throttle is calibrated correctly not sure what else to do. Could the KV be so low that I dont have the power ? Seems crazy that they would sell such a motor but what do I know.

3000kv is low ever for a 2.5" on 4S (which BNF was this?). I have an old iflight 2.5" cinewhoop that camer with their v1 1404-4600 kv motors. If it was a lighter open-prop build, you might get by with 3000kv or maybe if you were running high pitched or 5-blade props.

For the top end, there is not much you can do (assuming its not the vibrations limiting your punchout), but you can adjust your throttle curve in BF so that when your stick is at 50%, BF will read it as 70%. So at least for regular flying you won't have to keep the throttle pushed up all the time, but when you decide to punch out you would still be limited by the low kv.

(21-Apr-2024, 03:01 PM)Flybyjim Wrote: I had some Iflight 1404 3000kv motors in a 2.5 cinewhoop that wasnt being used any longer. I swapped the motors out and used them in a new Huricane 2.0 build. I figured they might be a bit big but decided to give it a try. The result was the exact opposite of what I thought would happen. Instead of being overpowered my throttle is at 70% just to get in the air and slow cruise. I flashed the newest betaflight firmware. Checked ESC firmware, I'm on blheli32.9. The settings etc seem to be fine in the configurator. I try another test flight with no luck its still doing the same thing. I try a different quad with the RC, no issues. I am on default betaflight settings and yet the cinewhoop is acting like I have a motor limit on it. I am using a Hakrc f722 45amp AIO. The quad flies horribly, bad shaking like something is out of balance until I load a UAV cinewhoop tune. The cinewhoop flies just fine with the tune but stuck needing 70% throttle. I have a few buillds under my belt, never have I needed to load a preset to get the quad to fly nice. I recall the 3000kv motors being very smooth but zero punch. I don't believe the previous build for the motors had the same issue but hadn't flown that quad in sometime. 
Any ideas what might be going on here? 

Thanks

I think your motor kV is simply too low for the voltage you are feeding them. I have a set of iFlight 1404 3800 kV and I use 3 cells on an open prop 3" quad. It will fly at around 40 percent throttle with some 3 bladed props. I went with some 5 blade props to try and it was flying at 25% throttle.

Presume no rev counter to see what they are making flat out? I suspect you are just not loading the motors into their sweet spot. Have you tried differing prop PITCH?

Thanks for the replies. Most of the issues were errors on my part. I had one of the props upside down, that takes care of the vibrations/shaking.I think the motors are more intended for a light 3-4 inch drone than a smaller 2inch. I swapped out the motors for 1303.5 4800kv, the quad flies wonderfully now. Thanks for taking the time and helping me.