Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 Hey fellas,
This my first drone build and I wanted to double check my numbers and make sure I'm not pushing anything to hard.
So far it was flying pretty good (IMO), but then one of my motors burnt up (i have a replacement coming) before I burn another I was hoping ya'll could doube check me.
My build is
Crazepony Carbon fiber 280 frame, 4 cobra 2204-32 (1960) motors quad), 18amp Kiss escs, Gemfan 6045 2 blade props. CCW3d FC, Lumenier TX5g6R 600mw 5.8 with raceband, sony 600 tvl ccd for fpv, floureon 4s 2200 45c and turnigy nanotech 3s 1300 45-90c, Fat Shark antenna. (Did I forget anything?)
Using my Taranis x9D plus.
Total weight is around 350 grams plus big battery (250 grams) about 600 total. Plus I want strap my full size gopro hero 5 to it (125) grams Bringing total weight to around 725-750 somewhere in there. I know that gopro is heavy (and i should put something else on there) but am I technically exceeding any limits with this setup? If so what should I replace/upgrade.
It seemed to run good without the gopro, but the day i put the gopro on i crashed it and I think i burnt the motor because it was jammed (and not overweight). I think my numbers crunched show im not overweight but im not positive. Whatcha think?
Any tips would be much appreciated,
Thanks,
-James ![[-]](https://intofpv.com/images/collapse.png) • Posts: 12,099 Threads: 125 Likes Received: 3,739 in 2,836 posts Likes Given: 99 Joined: Feb 2017 Reputation: 388 Seems to be a typical build. Only thing is the battery is a little large, but it shouldn't overload the motor. Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 I really like the kiss escs, but i fear it might be close with those 18a on 4s. Are they v1.2? • Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 (07-Sep-2017, 07:33 PM)fftunes Wrote: I really like the kiss escs, but i fear it might be close with those 18a on 4s. Are they v1.2? Yes they are v1.2 • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 (07-Sep-2017, 07:46 PM)james.r.fallon Wrote: Yes they are v1.2 Ok then there's a bit of protection... v1.1 were a bit sharper. Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 (07-Sep-2017, 08:05 PM)fftunes Wrote: Ok then there's a bit of protection... v1.1 were a bit sharper. At only 18a do you think this is my weak point? • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 These ESCs don't have a current limiter, so it's quite possible that a crash could cause your problem.
However, I think that with the rather heavy weight that you are running, along with the 6x4.5 props, you're exceeding the motor's design specifications.
The Cobra CM2204-32 is specified for a maximum current of 13A or 140W on 3S. On 3S, 6x4.5 props are just within spec. If you were running 4S, you've exceeded the motor's specs by a large margin. • Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 (07-Sep-2017, 09:41 PM)unseen Wrote: These ESCs don't have a current limiter, so it's quite possible that a crash could cause your problem.
However, I think that with the rather heavy weight that you are running, along with the 6x4.5 props, you're exceeding the motor's design specifications.
The Cobra CM2204-32 is specified for a maximum current of 13A or 140W on 3S. On 3S, 6x4.5 props are just within spec. If you were running 4S, you've exceeded the motor's specs by a large margin. Ah, so the motors are my weak point? If I stick with the 3s battery do you think all the components are sufficient for the weight? If i go 4s what should i bump the motors up to? • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 Your configuration, assuming an all up weight of 750g and 3S power will be slightly underpowered with only a 2.1:1 power to weight ratio. I'd want to be looking at a minimum of 2.5:1 to ensure that you have full control of the craft, especially as the battery starts to empty.
On 4S power, your motors will be pulling 250W at full throttle - way over their specified maximum of 140W. If you want to fly with that kind of weight, you need to look at larger propellers, slower and larger motors and ESCs to match. • Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 (07-Sep-2017, 10:03 PM)unseen Wrote: Your configuration, assuming an all up weight of 750g and 3S power will be slightly underpowered with only a 2.1:1 power to weight ratio. I'd want to be looking at a minimum of 2.5:1 to ensure that you have full control of the craft, especially as the battery starts to empty.
On 4S power, your motors will be pulling 250W at full throttle - way over their specified maximum of 140W. If you want to fly with that kind of weight, you need to look at larger propellers, slower and larger motors and ESCs to match. Damn, I wasnt planning on mounting this heavy gopro when i first starting specing components, but now I have one and wanted to use it. Guess the easiest (and less exspensive) solution is to leave the gopro off the quad (and stick with the 3s, or dont over throttle the 4s..heh), and mount a lighter camera • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 That's always the problem. You start off with a platform that is good for the function, weight and power that you originally budgeted for and then you start adding things.
To be honest, it's better to start off with the question: What do I want this craft to do? and design accordingly. If you then want a craft to fulfil a different function, build a new one instead of trying to force a square peg into a round hole. • Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 (07-Sep-2017, 10:30 PM)unseen Wrote: That's always the problem. You start off with a platform that is good for the function, weight and power that you originally budgeted for and then you start adding things.
To be honest, it's better to start off with the question: What do I want this craft to do? and design accordingly. If you then want a craft to fulfil a different function, build a new one instead of trying to force a square peg into a round hole. Yeah i was ready to build another one anyways  Posts: 1,590 Threads: 89 Likes Received: 1,283 in 768 posts Likes Given: 1,274 Joined: Jan 2017 Reputation: 31 (07-Sep-2017, 10:50 PM)james.r.fallon Wrote: Yeah i was ready to build another one anyways Here is another way to look at it. Depending on how much you spend on some of the more expensive items, you could probably put together a quad that'll handle the weight for $250-$400... so depending on how you got the camera and how much it cost you or how much it would cost to replace it with a hero 5 session (which still weighs half as much as the hero 5 BTW) the more fun and fiscally responsible way to go might be to build a new one! carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein, Slightly modified Vortex 250 • Posts: 72 Threads: 2 Likes Received: 32 in 22 posts Likes Given: 1 Joined: Jun 2017 Reputation: 0 I've had a setup quite similar in the past.
Kiss 18A esc with a AUW also arround 660 gr on cobra 2204 1960kv but on 5 inch props
I think you should give the different props a go.
Flying 5 inch on a 6 inch frame doesn't really matter.
I do believe 4S with 5 inch prop flies nicer than 3S with 6 inch prop, but just give it a go and see what you like.
Step it up slowly, try a prop, hover for a min and check motor temp.
Then fly slow for a min, check temp
Fly a bit faster and check temp etc. Posts: 8 Threads: 1 Likes Received: 3 in 2 posts Likes Given: 3 Joined: Sep 2017 Reputation: 0 08-Sep-2017, 03:04 PM (This post was last modified: 08-Sep-2017, 03:06 PM by james.r.fallon.) (08-Sep-2017, 10:23 AM)Carl.Vegas Wrote: Here is another way to look at it.
Depending on how much you spend on some of the more expensive items, you could probably put together a quad that'll handle the weight for $250-$400... so depending on how you got the camera and how much it cost you or how much it would cost to replace it with a hero 5 session (which still weighs half as much as the hero 5 BTW) the more fun and fiscally responsible way to go might be to build a new one! 250-400? Lol..thanks for the advice, but it will take far less $$ to build a quad that will handle that heavy gopro.
(08-Sep-2017, 11:13 AM)Fint Wrote: I've had a setup quite similar in the past.
Kiss 18A esc with a AUW also arround 660 gr on cobra 2204 1960kv but on 5 inch props
I think you should give the different props a go.
Flying 5 inch on a 6 inch frame doesn't really matter.
I do believe 4S with 5 inch prop flies nicer than 3S with 6 inch prop, but just give it a go and see what you like.
Step it up slowly, try a prop, hover for a min and check motor temp.
Then fly slow for a min, check temp
Fly a bit faster and check temp etc. WHich props were you running on that setup? • |
