Posts: 312 Threads: 70 Likes Received: 133 in 74 posts Likes Given: 123 Joined: Dec 2021 Reputation: 8 (16-Jul-2022, 07:27 PM)iFly4rotors Wrote: I agree with Banelle, 1550 Kv sounds a bit low.
On the other hand, you said that you all of this same gear on a different frame and
got better performance. Now, I am curious...what is the weight difference between
the two frames?? I could be that you have picked up a bit too much weight. The other setup was only 162g dry, so that could definitely be a major difference - I happen to have a bunch of 2500kv motors that I'm thinking of trying on it, would I have to limit the power, or would 2500kv be okay for 6s? ![[-]](https://intofpv.com/images/collapse.png) • Posts: 5,851 Threads: 47 Likes Received: 2,775 in 2,237 posts Likes Given: 7,601 Joined: Jul 2019 Reputation: 97 (16-Jul-2022, 08:12 PM)relentlesstech Wrote: The other setup was only 162g dry, so that could definitely be a major difference - I happen to have a bunch of 2500kv motors that I'm thinking of trying on it, would I have to limit the power, or would 2500kv be okay for 6s? Hi Relentlesstech, Yeah, 40 grams is a lot on a sub-250 gram quad. It WILL make a difference. That is almost 30 percent weight increase. If I increased my weight by 30 percent, then I would run a lot slower, too.  Seriously, it is a lot of extra weight. I have been compiling data in a spreadsheet for about 2 years now. I refer to it often when I want to compare components or see what might work best in a particular build. Most of the motors rated up to 6S have KV values from 2500 KV to 4300 KV with most of them in the mid 3xxx range. So, given that, I would say that you could easily run 6S on a 2500 KV motor. I will qualify that with the fact that motor ratings seem to have quite a variance from brand to brand and even from motor to motor. So, nothing is 100 percent guaranteed, but still, they should be fine running on 6S. I would try the motors on 6S, straight up and see how they do. Yeah, you might check the motors after a flight and see if they get hot, but my guess is that they won't. Just be a little careful at first, start a little slower then ramp things up as you keep checking them. My money says that everything will be fine. If you have not yet used a 6S battery with these motors, you will likely see a bit of a performance increase. By the way, there is a lot of interesting information in my spreadsheet. The different components are organized in their own tab and each frame size has its own tab. I have recently added a new "Build Guide" tab to assist with determining weight allowances for the various components. Even though I do try to keep it updated, things seem to change pretty fast these days. Anyway, check it out --> Parts Guide <-- Click to Download. Posts: 1,312 Threads: 50 Likes Received: 832 in 504 posts Likes Given: 372 Joined: Jul 2018 Reputation: 51 Yeah, if that's the 45A ESC then it should be absolutely fine.
The ground is for dead people. Posts: 312 Threads: 70 Likes Received: 133 in 74 posts Likes Given: 123 Joined: Dec 2021 Reputation: 8 17-Jul-2022, 03:57 PM (This post was last modified: 17-Jul-2022, 03:57 PM by relentlesstech.) I am now adding BetaFPV to my list of 'avoid these at all costs', along with iFlight - Two of my brand new motors on this build came apart, and who knows where the bells went (Just spent an hour searching so far, and not giving up until I find them, who cares if it's 92% with 70% humidity out!) LOL • Posts: 312 Threads: 70 Likes Received: 133 in 74 posts Likes Given: 123 Joined: Dec 2021 Reputation: 8 Finally got to finish this build, and take it for a flight - It went pretty good!
3600kv motors, running 6s, motor output limit @ 85% - Motors barely get warm, so I may bump it up to 90%
Posts: 37 Threads: 0 Likes Received: 28 in 19 posts Likes Given: 0 Joined: Oct 2020 Reputation: 2 (10-Aug-2022, 10:31 PM)relentlesstech Wrote: Finally got to finish this build, and take it for a flight - It went pretty good!
3600kv motors, running 6s, motor output limit @ 85% - Motors barely get warm, so I may bump it up to 90%
Heya RT, footage looks great, think you finally got the right combo here! My favourite "kickass 3inch" setup right now is 4850s (9.5g each) at 4s with 85% output limit (anything more and it starts feeling like it wants to rip itself apart in mid-air) so your setup sounds similar in terms of output at 6s but IANAME (I Am Not a Motor Engineer) so its just a "feel" thing for me! I might have missed it, what are your 3600kv motors ?? • Posts: 312 Threads: 70 Likes Received: 133 in 74 posts Likes Given: 123 Joined: Dec 2021 Reputation: 8 (11-Aug-2022, 06:04 AM)emsee Wrote: I might have missed it, what are your 3600kv motors ?? They are Xing-E 1404s Posts: 932 Threads: 49 Likes Received: 192 in 157 posts Likes Given: 186 Joined: Jul 2020 Reputation: 11 I’m wanting to build a small one I can fly around the yard. If I’m used to 5” and 7” will it be disappointing to fly a 3”? Can you get the same performance with the smaller quad? • Posts: 312 Threads: 70 Likes Received: 133 in 74 posts Likes Given: 123 Joined: Dec 2021 Reputation: 8 I'm used to 5", and this 3" has become my favorite ripper! Once I got the motor output right, and threw a tune on it, it flies better than any of my 5" - It is extra nimble, just doesn't have the 'throw' that the 5" have (When I throttle up on my 5" I can clear an entire field before I start dropping, but the 3" doesn't have that kind of weight LOL) • |
