Motors Thrust Help

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claytonbakerjr

Member
Hey all
Bare with me I am still learning but would like to get some solid feedback.
The next step in my "From the Ground up" build is purchasing some motors.
I know for the most part it could be a trial and error thing but I want to at least
have a good starting point...money does not grow on trees in Ohio :) (I am working on this presently) :)
So here is some basic thrust data I copied from another site...

DYS 1806/2300 KV Motor
GF 5030 Prop - 415 Grams pulling 9.0A @ 100% / 230 Grams pulling 3.6A @ 50%
HQ 5030 Prop - 360 Grams pulling 7.5A @ 100% / 205 Grams pulling 3.3A @ 50%
HQ 5040 Prop - 440 Grams pulling 10.6A @ 100% / 225 Grams pulling 4.2A @ 50%
HQ 6030 Prop - 485 Grams pulling 10.2A @ 100% / 240 Grams pulling 4.0A @ 50%
HQ 6045 Prop - 580 Grams pulling 16.1A @ 100% / 235 Grams pulling 5.1A @ 50%
SunnySky X2204S 2300 KV Motor
GF 5030 Prop - 345 Grams pulling 7.1A @ 100% / 130 Grams pulling 2.0A @ 50%
HQ 5030 Prop - 285 Grams pulling 5.5A @ 100% / 120 Grams pulling 1.8A @ 50%
HQ 5040 Prop - 360 Grams pulling 8.9A @ 100% / 135 Grams pulling 2.2A @ 50%
HQ 6030 Prop - 395 Grams pulling 8.5A @ 100% / 120 Grams pulling 2.2A @ 50%
HQ 6045 Prop - 560 Grams pulling 16.1A @ 100% / 215 Grams pulling 4.0A @ 50%

So here is what I have
From the gear I already have from a 250 build I recently completed the total weight for this rig will be at 580 grams
including all FPV/Camera/everything (battery also).

The basic size of the quad I am working on is considered a 300 MM but will have final measurements
once I get my arms on.

I have seen mention of people stating use the 1.5 rule and others saying use the 2.0 rule for configuring motors.
I really do not foresee this quad getting much more heavier than it already is. At best maybe 650 grams tops.
But I would have to add a lot of Bling to get there.
I also simply used the weight of my current DYS 1806/2300 motor as a guide.

In any case...Looking over the data and using the following rule "weight times 1.5 divided by 4, I have come up with the following:
Instead of using 580 as my guide I went up to 600 just to round it off...
600x1.5=900÷4=225
225 being amount of thrust needed per motor to lift this quad.
Even at using the x2 ratio I am still at 300 grams per motor.

Now I am going to use either a 6030 or a 6045 prop however there is enough room for a 7 inch prop need be.
I do not plan on breaking any speed records but will want to have some fun.

Looking at the data it seems (unless I am reading it wrong) from the 2 motors I selected in my research both provide
adequate thrust to lift this mini beast???

Now I am assuming that the thrust configs are based on a 100% throttle model.
In your opinion would the above mentioned motors/KV's be suitable for the quad/weight?

In the 2 above results I notice that the 6045 props seems to pull much more amps than the
6030's. Knowing this was at 100% and that the 12amp ESC's provide a max of 18amps thrust
in short bursts I could say the 12amp ESC's should be fine?
Any thoughts would be greatly appreciated.
Again thanks for your time.
 
Derek

Derek

Well-Known Member
I'm still learning about the "whole quad scene" myself but, since you said that you aren't gonna be breaking any speed records anyway...in my opinion, either motor with either the 6030 or 6045's will suit you just fine. I have SunnySky 2207 2100kv motors with HQ 5x4 props, running on 3S (capable of 4S) and my quad runs very well and nothing comes down hot.
 
Stambo

Stambo

Well-Known Member
All I can suggest is too much is better than not enough. :)
I would probably be looking at the 2207 sunnyskys like Derek has.
You then have the option of running 4s if required.
You would also need to factor in 4s capable ESCs.
 
C

claytonbakerjr

Member
Checked out a thrust test on these using 3s and 4s...very nice.
Now then other than a slight weight increase why wouldn't I want to jump into a 20 amp esc with these?
Derek
Where did you obtain yours from?
 
Stambo

Stambo

Well-Known Member
claytonbakerjr said:
Checked out a thrust test on these using 3s and 4s...very nice.
Now then other than a slight weight increase why wouldn't I want to jump into a 20 amp esc with these?
Derek
Where did you obtain yours from?
Click to expand...

I would certainly look at 18 or 20 amp ESCs for the 2207.
Preferably something that supports or is already flashed BLheli and oneshot.
Those that have tried it all rave about it.
 
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claytonbakerjr

Member
Looks like these are popular...hard to find in stock :/
Also they weight slightly more than the DYS motors, 34 grams versus 18.
Still within my tolerance but shaved 64 grams off of my overhead.
Even still between 80% to 100% the thrust results for a 6 inch prop are above 400 grams
which with the added weight of the motors I need to achieve 332 per motor.
Which the plus side is if I decide to plop a 4s battery on it then I increase at least 100+
addition grams of thrust.

Here is another video I found on thrust tests for this motor.
Seems a 3S will work but a 4S is ideal.
Derek you are running 3S now how is it working out for you?
https://www.youtube.com/watch?v=QMUOF5qNxS8
 
Stambo

Stambo

Well-Known Member
The quad will be much harder to control on 4s as throttle response will be more extreme.
I would suggest 3s for learning then 4s for some serious fun. :)
 
C

claytonbakerjr

Member
[emoji41] sounds good thanks stam.
I've got at least 7 3s batteries ranging from 1300 to 1800 I'm sure I will find a sweet spot.
Now to find those dang motors lol.
 
Stambo

Stambo

Well-Known Member
Just remember that these are not low end motors.
Your 1300 batteries, unless they are fairly high C rated, may have problems keeping up with peak demand on punchouts. :)

I have some of these motors but they will not go on anything but a Blackout or a QAV once I can afford it. :)
 
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claytonbakerjr

Member
Then again maybe not, I Googled x2204/2300kv and most of the returns showed a SunnySky motor
that is only 2s/3s yet his site states using 3s/4s......
 
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claytonbakerjr

Member
Well got all of the hardware and arms ordered and on the way but man I tell you
finding motors is next to impossible.
The SunnySkys recommended are out of stock every where except for reverse threaded at MRM.
So I was looking at the Cobra line and found COBRA CM-2204/32 MULTIROTOR MOTOR, KV=1960
and guess what...OUT Of Stock :(
I may end up popping some 2300KV's on this thing just to get it airborne....
I reached out to MRM to see when they may have an ETA on the Sunnys but boy...what a chore.
 
Tony

Tony

Staff member
for a 250-300 size quad, the 2200's on a 5x3 prop should do quite well.

I have never heard of that site though, but that is not saying much, I'm about as new as you are into the quad scene lol. Only one way to find out, but him saying you can use 4s and everyone else saying 3s would make me a little worried. However, just how often are you going to run at max power? Not that often unless you are racing. So that may be his kicker.
 
Tony

Tony

Staff member
This is the stuff that kept me out of the quad game so long. There are just way too many options lol.
 
Nikhil Rathore

Nikhil Rathore

New Member
Sorry to interfere but my doubt is "is it important to have thrust of motor more than the aircraft's weight to fly" for example a ntm propdrive 2836 3000kv with 4.75x4.75 prop on 4s produce 1.4 of thrust will it be enough to fly a 2kg weighted aircraft?
 
Tony

Tony

Staff member
No, you do not need more thrust than the plane weighs. Almost every single REAL airplane has a much lower thrust to weight ratio and they still fly. In Rc, 3D planes are really the only thing that need more thrust than they weigh.
 
Nikhil Rathore

Nikhil Rathore

New Member
Thanks, so it means that my homemade plane should be able to fly (the plane I am talking about is that I have given in the example )
 
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