To my first review it’s fair to beggin with the
very first motor that I use in my first DIY drone, RCX ZMR 1804 2400KV. I set
it in f250 glass fiber quad.
In fist lookup RCX are small and light motors
but powerfull anyway. Exactly 13.4g, so perfect to set and don’t be worried
about the weight. Furthermore, it’s diameter only 23mm, 5mm in axis.
Theoretically, provide 2400KV and may set with
2S (7.4V) or 3S (11.1V) batteries so discard mounting with 4S batteries, are
not allowed, looking in datasheets.
Package include M2 screws to fix the motors in
the frame. Also, one nut per motor to set the propellers.
Could be found in CW (Clock Wise) and CCW
(Counter Clock Wise) but, to be honest, I have never found CW model. It’s could
a problem using nut provided in the package, because tend to unscrew. Also,
screws are quite short and should be re-screw almost before every flight.
Both issues could be easily solved. Setting few
larger M2 screws, cheap and common, let you flight securely. On the other hand,
aluminum auto-tapping nuts will hold your props very strongly to motors.
Finally, in this moment you could find RCX
motors less than 10€ each one.
Who are they for?
As I told you previously are the one which I
used in my very first quad settings so destination user is, mainly, beginners.
Why? Easy to explain, they are very cheap
brushless motors and easy to find out so you wouldn’t suffer so much if your
first crashes break a couple of these.
Furthermore, are very light and small motors
that make easier the quad build. It wouldn’t affect your flight weight.
I like
Cheap
Very light
Easy to find out (very common)
Good thrust keeping in mind weight and price
I don’t like
- M2 screws are very short to set the motors
firmly, provoking motor jumps if you don’t tight it every time you are going to
fly.
Solution: Buy M2 screw pack little longer and set it
with rings to set it firmly. Please, be careful to not set a too long one in
order to avoid screws block the motor rotating movement.
- Provided nuts are low quality and will
deteriorate by use. Taking into account will be focused to beginners, you
surely must change usually propellers.
Solution: Easy as I said before. Buy aluminum auto-tapping
nuts to hold the props. You could find it out for a little money.
- After intense shock these motors may decrease
his performance considerably so you should swap it. The main problem is the
rotation will be affected so shocked one will rotate slowly and your quad
control will be affected. Very easy to notice because the quadcopter will tend
to fly always in same direction.
Solution: You should buy at least two or three spare
motors.
- Mounted wires are very tiny. It will affect the
moment you solder it to ESC and, mainly, could be pull out if your motors get
loose by the screw problem. In that case will be very difficult to repair.
Soultion: You
should fasten it with plastic bridle to the frame to prevent the pull out and
ensure the solder with shrinkable pieces.
Features
RCX ZMR 1804 2400KV
Motor diameter = 23 mm.
Axis diameter = 5 mm.
Nuts diameter = 2mm (M2)
Weight = 13.4 g.
Voltage = 2-3 S (6v–12v)
Revolutions per minute per applied volt = 2400
KV.
Thrust tests:
Test were done with two propeller sizes 6030
and 5030.
5030 = Thrust is close to 300g
6030 = Thrust get over 300g (very close to
350g)
In summary
Even there is several unfavourable features I
strongly recommend these motors to beginners mainly based in three
characteristics: are powerful, light and cheap. Maybe you could find find
better motor to begin with but I am pretty sure it would be more expensive that
RCX.
Do not hesitate to get it, performance it’s
better than good.
My recommendation
If you finally decide to set these motors to
your multicopters notice that behaviour depends mainly on the size of the
propellers. I have test with my quad with f250 frame where the proper ones are
5030 size. So, I have checked this one and also 6030, which are significant
bigger. There is a big difference between each.
In case of beginners I highly recommend 6030
because make the quads much more stables and easy to control. On the other
hand, you must be very careful due the props are so big that will be rotating
so close to frame and could cut any part as esc wires for instance. Not in all
frames will fit. Furthermore, make the rotors get higher temperatures, so you
would take it into account. In my tests, I was flying for more than 15 minutes uninterrupted
and there was no problems.
Regards.
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