hello everybody welcome to a new episode of how to diy rc hope you like what to see and subscribe
and in today's episode is all about JJRC H37 maintenance to keep it in top
condition to get the best quality pictures and video from your
selfie drone before we going to test the vibration of this little drone you have
to make sure that your nuts and screws in this case of the propellers are tight
so you don't lose and during the test and maybe hit your eye there will be very
dangerous so you do this for all four motors and you check
if they're nice and secure then we can go ahead and start the test and the
first way you can know this if a motor is going bad is by hearing it the makes
more noise and I'm when you can hear that one motor at least one motor is
making a lot more noise so that's not a good sign but it's perfectly for this
video to show you how to check it and fix the common problem and get a good
video quality the second way is by touch and eye so you're going to start the
motors and feel its propeller its arm and then compare it with the next and
see which one is give you more vibration
oh this one in the rear is giving me a lot of vibration but I can also see by
eye that this propeller is not straight it's just wobbling around from left to
right it is the second way that you can check your propellers
let's looking from above and see if the nut on this case the screw is centered
and you can see it wobbling it a little bit when you check it from above and you
check it sideways and you have to see a look if you can see one propeller
spinning in the air if you see in two blades that means the propeller is out
of balance and it's shut fix the propeller or the gear or the motor to
get it you can see the wobble that is really bad
that creates extra vibrations and jello towards the camera that you don't want
and to fix the problem of the drone we first want to have to power it off and
remove the battery just to be safe so you don't set fire to the circuit
board and destroy your quadcopter now that's safe to look on the Quad first
always going to remove the propellers and
have removed all four propellers it's time to get a magnet so you're not going
to lose all these tiny screws and you can place them in order of disassembly
so you know how to put them back and into its place you have to put a back
because it's a chance you will find different lengths of screws that will
fit in one place now just go ahead and just undo every screw you can find in
this case there are four screws on each side in front and in the rear and
there's two screws in the middle that I think holds the whole body together and
there's the last screw so let's take them apart but be gentle and that's
one side coming loose and just gently poke up the other side many screws are
still tight then just undo them a little bit more hire it comes
look at that there's a pretty strange flight controller normally it's small on this time
and straight and long but it's nice balance out the quadcopter it's little
bit heavier on the backside but having a battery in the middle that's a nice
thing all the wires are here pretty compact look at the build quality hmm so
long job is not the best but not seeing anything we'll weird
it looks pretty okay but I don't like this mess of wires here at the front
those are a lot of wires just bundled together but now that we have removed
the upper body we can easily remove the arms out of its case but be careful also
that is not click on a click off but now at least we can disassemble each arm and
check for any problems and it was this propeller that was shaking a lot
wobbling from left to right let's open it up but I can see that the screws are
here or very small but it's screws of the body are pretty long so you have to keep
them separated let's disassemble the arm and check what's up I'm going to be
pretty interested to see how it's working with a gear or
direct or as a prop direct driven from the motor but I find a rubber
o-ring going on top of the arm this to kill vibration is going to the camera so
that's a good job you've been needing a little screwdriver to push in a little
clicking pins open it up shame they didn't use an extra screw for it it's so
super tight and you recommend to be very gentle not really the best solution that
they used to click on a click open and close off the arm
and I can find this little screw this little gear running from the motor
towards the propeller to give it a little bit more torque instead of RPM
now we have opened up the motor one arm looks like when it's disassembled and
it's just a question of looking at this gear this is chopped cheap plastic it's
not centered perfectly and there's no bushing in the arm like with the e58 I
got a metal bushing to keep it all nice and straight but this is just plastic on
plastic and only a little bit of oil I would like to place some grease there to
make it around a little bit smoother and checking the size of the model
seven millimeters wide just checking the length and I think my guess is yeah
that's 2 centimeters that's clear yep exactly 2 centimeters that's perfect
they are nice and powerful motors for such a little drone make it interesting
too little later I lift test and a thrust test but now this is all we're going to
have to assemble the motor back in its place
and this is just a click system so click on and then the last piece goes on top
and just hold on a a few screws it's all nice and easy
and simple and the arm is completely fully assembled again you can put it
back in its place just make sure that a wires I'm not gonna
be stuck it was one more arm that we didn't like it was this one in the rear
then we also going to have to check put them in on this is a lot easier than
putting it of just also have to disassemble this one real quick with the
second arm that created so much vibrations we found a really strange way
problem check this out and turning it the direction it shut turn you can see it's
holding back it's stopping there's a vibe there's a vibration this there's a
blockage the other very spins completely free no
problem at all again you can hear it it's no good there
is a little issue and all the gears check them look pretty clean there's no
garbage in between them that can cause the problem the only way I can fix it
now because it's running smooth the other way around I'm going to change
this arm and turn it sorry other way to make it turn counter clockwise instead
of clockwise so it runs smooth and in the meantime we can wait of course until
the new arm and parts will arrive but we can still fly because it one motor is
spinning rough one way and smooth the other way I'm just going to change it up
so the motor next to it and just desolder these two wires and change them out
I just need to make sure the motors are turning the correct way
when I solder them back luckily we did some pre maintenance and we fit at least
this problem one time thought gets worse and in the meantime you can order
a spare part so if you really need to replace it in the end but we can still keep on
flying without hurting the motor anymore then it's already been hurting all this
time fiddly job at the same time we can also improve the solder joints because
they are looking pretty rough the original ones it doesn't show the really
the best quality that I would like to have seen with this little drone but now
it's just fine question of putting the motors back in its place and then give
it a little test see if the motors and props are spinning the correct way and
of course this one turns counterclockwise this motor turns
clockwise this motor turns counterclockwise and this motor turns
clockwise for your beginners they don't know but if you know it it's pretty
simple job I just have to find the correct propeller that goes with it and
its scoops when it's turning counterclockwise so that goes on this
motor that is counter clockwise and this propeller scoops clock wise so
that's going to go on the motor turns clockwise then of course don't forget
the screws put the pops on this place and they don't take off during the test
flight and then we connect the battery of course and then pretty simple test
make sure the motor sits good into its place it's a bit tricky of course you don't
want them but I'm not going to assemble the drone and then to find out that
the motors the wrong way and then have to disassemble everything
again so we always do a simple check but it's quick one and then and there's a
little button right here at the end is the on/off switch
so we have assembled an arms and put it back in place because this is a one
problem that we have solved there's one problem less they can cause any issues
during flight I was just gonna be interested to see the rest of the
components of this little drone so let's take off the lampshade rotate and remove
the camera with it and there's not a little space so I'm gonna just check
show you guys that little camera because it's really it's just as big as my pinky
it's a super small camera and behind it we have a little red board that connects
the camera and then at back we have a small shows up pretty bad as you can see
behind the board of the red camera there's a little blue boat that is the
Wifi FPV module it sends all the connection with your will telephone but I'm
looking at it looking for a antenna it's also shows really bad but it's one small
little antenna right over here it runs to the Wifi module so that's for the
wifi connection and then I was looking at the
circuit board you can find here at antenna and they put just the joint of
solder on it so if you're going to add our own antenna over here you can extend
the range by a whole bunch and definitely when you're flying in the
noisy area with a lot of Wifi FPV will decrease the range of your little drone
of course this is a selfie drone you're not going to be flying the far away
anyways but just in case it's always good to have the best connection that
you can get and add your own Antenna I may have found a little spare antenna as
little I would love to have it a little bit bigger because the bigger the
antenna the longer it is the more range you get tested at several times and it's
also smart to let the antenna stick outside the canopy to get some better
connection with the transmitter and of course do the same with the transmitter
so now we have seen all the components of the drone we have improved the arms
we have improved the range with Antenna we have checked with Wifi FPV
now this little antenna I'm gonna just pull up and poke in
Lower side of the body and they just poke out and just attend a poke out on
the top of the canopy and looking at the quality I'm not really impressed but I
do like that it's a really small tiny package you need to be consider that its not
easy job to get it so small as this I mean it's foldable down it really fits
in your pocket you don't need a bag it's really nice that it put of course a extra
pouch with it but you don't need it now I'm just going to put all the componants
back in this place being very carefully they made the margins of the plastic
very small this is all just a tight fit and that's a good thing that means it
has less things that are vibrating loose and it creates so much less
vibration towards the camera and giving you better video quality so this is a
good thing but it's pretty difficult fibbly job to put it all back together and
of course don't forget to put the four rubber o-rings on top of the arms this
is also killing vibration that's going towards the camera and also towards a
gyro so the gyro will be also a lot more happier because vibrations are stressing
out and gyro making it fly a lot more mmm out of balance lets me say it will
be a lot more tricky a lot more jumping and not so smooth the less vibrations
going towards the gyro the smoother your drone fly and therefore the
smoother your camera footage video will be well we have placed those four rubber
pieces and I'm just going to put that canopy back in its place but first we're
going to poke hall and to poke a hole in the canopy to make some room for the
antenna we're gonna use my soldering machine
just really quick and dirty fix yep now we are going to put the
canopy back to a antenna through that little hole that we on its place we have to poke
made I need to be very careful with motor wires that we are not going
to damage them in any way and it will still run smooth
and the o rings will stay in there place that's pretty important that you don't
lose those check all four arms if they are sitting correct and if it's all
sitting nice and tight and there's not enough a lot of space in between we can
start off the way we'd end it and as using the two middle screws for the body
first and then going around to the four screws in the rear and in the back you
screw down the screws you don't want to over tighten them and worn out the treads
but you do want to make it tight so that you don't lose them during fligh and
also each flight you want to check if they are still in this place or you have
to tighten them up so you don't leave bad flight the second time around now
it's time to put the propellers back in its place
and I'm just gonna show you one way you can see that it's scooping when it's
turning counterclockwise that means it needs to go on on a motor that turns
counterclockwise and these two motors are spinning
towards each other and these two motors are spinning towards each other and it
means that this one is counterclockwise and this one is counterclockwise and these
two turn clockwise and this prop needs to turn counterclockwise to create lift
because it's scooping and you can see the way it scoops it's turning
counterclockwise just say three times because a lot of people don't know a lot
of beginners that are buying these quadcopters that can make a little mistake we
just have to help you guys wherever we can and just going to screw the propellers
and then we have two propellers that turn clockwise to create lift now the
we I finish the full assembly of the day you have a jjrc h37 mini baby elfie drone it's time to do
one more test before we going outside for test flight and that's checking if
the motors and propellers are spinning the correct way
take off look but and take off the meens that the motors and propellers are turning
the correct way and sitting on the right place and it means it's very to go
outside and do a test flight but this video of the maintenance guide is going
to stop over here I really hope this video was helpful to you guys and we'll
be giving it a lot of thumbs ups if it wasn't well to give it a thumbs down and
if you have any questions then leave it down below in the comment area and I
hope you subscribe for the next episode we go through a test flight and I want
to say goodbye until next time
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