this is the VF 390 a 390 mm fan that is
by far the scariest thing we have ever
attached to a computer it is made entirely out of carbon fiber it spins at
a whopping 10,000 RPM blowing wind out
the back at 450 km an hour and guzzles a
potentially lethal 250
Amps do you remember our last highest
airfow PC the one that literally blew the top off our computer case those two
fans combined were 2 horsepower the VF
390 is
60 I don't know how long I'm going to be alive so before I go I'd like to tell
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come with me this is our problem see that Transformer back there even if we
took the entire power allocation of this
industrial unit and powered the fan with it it wouldn't be enough to do it
legally and even if it could What Mortal
power outlet and cord could carry that kind of current for context a standard
nor North American Outlet will do just south of 2,000 Watts our torac can pull
up to 4.8 th000 Watts out of the outlet
behind it this fan calls for nearly 10
times that 45,000 Watts which left us
with only a couple of potential options for powering it option number the first
was to build a Frankenstein battery out of 18650 cells we've actually done that
on this channel before but Frank neither Kyle nor Alex trusted me
building a come on with a lithium battery with the
240 cells okay that would have been a pretty
bad idea a second option for powering the fan was to buy the battery from a
Chevy Volt it's a little on the high side at 360 volt but because of how GM
manufactured it having the voltage to something that would be usable for our
fan is actually relatively simple the problem with that solution is that for
one a volt battery is darn expensive and
for two once we fiddled with the pack charging it could be difficult and or
dangerous given the short timeline for this video then we decided to go the
simplest route and spend
$2500 on high current LiPO batteries but
we won't be using them all at once instead we're going to be doing this
this is flamable isn't it oh good we've wired up six of our battery packs Each
of which is four cells in series making
a total of 24s that gets us up to the
voltage that we need and given that these are high performance 130c packs
theoretically they could handle up to what 700 amps but we need about 250
meaning this should be perfect as long as we don't want to run it very long you
see we haven't run any packs in parallel which means that Full Tilt we're going
to be looking at about 6 minutes of runtime even if we account for our
Reserve packs here that gives us 12 minutes of runtime meaning we better get
this right on the first try before we just connected it to the battery though
Alex and Kyle over here needed to make sure that it worked the plan so we
hopefully don't blow up something if something's not working correctly is to
use this power supply and a boost converter so that we can have 48 volts
coming out of this into our fan and we'll have current limits right on here
so that if something's incorrect nothing
goes super bad this is the ESC for any
of you that don't know what an ESC is it takes DC generally from a battery and
converts it to three-phase AC which is plugged into an induction motor of some
kind so if this right here gets to about 80 85° or so we're going to have to cut
the fan turn her down a bit so notice that it's a capon taped
for isolation it's uh about capacitors all
the actual business end is underneath here that's where all the fets will be
uh that do all the switching to get your three-phase out um and then there's your
control your logic board one thing we have to be careful of with this is the
inrush current so you don't want to just connect all of your batteries to this at
once because these will briefly act as a ShortCircuit ah yes but they thought of
that may I introduce you to Mr spark lead so inside here this lead is a
resistor when there's a resistance between this lead and the that lead if
you attach these two points together it will slowly charge the capacitors
instead of charging them really quickly so all that we're doing now is plugging
it in plugging it in making sure nothing explodes you plug the hot side
in okay
Co then you plug this
in no spark you plug that in okay now we
smell for Magic Smoke the easy way to test now if it's actually getting power
is to probe the pwm lead or you can probe this lead here BS yeah is power oh
there is a pwm signal oh yes you can see it ha yeah this is a very good
explanation of what pulse width modulation is you have a period which is
the frequency at which this is switching and I think this is 50 HZ which is what
comes out of a standard RC and what you're changing is the amount of time
that the signal is on right so if this
is when it's off and that's when it's on so right now I have the channel which is
this little potentiometer set all the way to zero so fan is no no no going
right now I am going to slowly rotate
this potentiometer and you will see how that line reacts to it that small
distance between there and there is the
difference between that fan not moving
and then blowing the computer away we're going to bolt this Frame to the buing
table so we don't send both of them into the
stratosphere oh hello hello
sir oh goodness yeah
like that's 10%
power I think I'm might need almost need new underwear from LT store.com it works
we didn't blow anything up that actually went way better than I thought it did so
Alex I know lonus is going to want it
but every fiber of my bean does not want to hand him the remote yeah that will be
dangerous oh no I want to do the throttle no not no I want to do the
throttle what we have tested before is running this off of a single boost
converter and it worked well enough and that was great cuz we wanted the current
limits and stuff in case something tried to blow up yeah now I've put two of them
in parallel so we can hopefully get about 60 amps out of it something like
that sick so we can play with this for a bit and not drain our batteries oh okay
but maybe these will explode we'll see okay so can you power it on okay and I
should be holding this down right outut is the output on uh yes they're coming
from the big boy so I'm connecting the heart okay hand me the spark Le yep
whoa it makes a sound when you power it on it'll make six sounds just give me a
sec just give it a second I know you like to send it but okay I I will be
gentle I'll be gentle so it's not the trigger it's not the trigger it's the
pot over there just because the trigger's too way too sensitive so
you're going to turn that pot and it's going to automatically just kick on at 40% the amount of concern I'm seeing
from you one who is normally kind of Reckless actually really makes me worry
about because you have the remote oh there you go
now oh a little bit more it it doesn't
sound quite right there we go there you go oo that's much better wow it's
actually surprisingly quiet we're drawing 8 amps at what voltage at 48
volts at 48 volts so that's four that's
wait this is 2% power yep what the hell
is going on here gentlemen wait how many amps can we do at 100 volts we can do up
to 250 amps at 100 volts what yeah what
this is this is not that much this is
unbelievable what the actual heck is
going on here okay so hold on how many watts is this uh 24 * 12 amp so like so
this is 250 Watts this thing will do 45
,000 wats what's the difference between this and a jet turbine uh do you do you
know how much thrust this has no 60 kg
so if you had a person that weighed 60 kg they could ride it yeah dear God in
heaven do you understand do you understand what's going to happen to the
computer that we put here all right okay let's get the duct
tape this is carbon fiber reinforced pet G which I'm pretty sure is going to be
fine workers comp wants to know your
do not try this at home actually though
like seriously I'm not too worried about people trying this at home this is an
8,000 yeah yeah so let me get this straight this is the adapter from the
arshole of the fan as Kyle calls it how do we to the computer yeah how how is
this supposed to work just just just relax trust me basically the concern is
that with that amount of air flow going through here not only can we not have
any fans in its way because they're going to over Spin and blow out the
headers on the motherboard it may actually like lift things away from each
other like to put it in context
450 km an hour that's what double the
speed of a category 5 hurricane yes yes yeah there's going to be a double
hurricane inside this computer where's the H you're duct taping the Shroud to
the fan du better idea that's not going to do Jack you guys this is a duct it's
called duct tape the force of the computer pushing against it with the
cross brace is going to hold it in place does the cross brace come
up cuz it's just going to blow it off that's what the tie downs are for it's
going to tie it down we have thought about this where's the
hammer we've settled on a core I9 11900
K and this is an RTX
270 I sincerely hope they survive don't worry it's not
good catch new guy dang that was very
close to shattering earlier than we expected I really think that we should
french rally car all of the glass panels
I don't know what the freak that means does that mean they normally tape up their headlights so if they shatter the
glass doesn't go everywhere you know people often walk up to me and say oh
it's so cool to meet you I'm your biggest fan now that will never be true
ever again because this is my biggest fan
um I forget how these
work seems pretty stable
right easy okay cool um hit me
with okay she's on okay she's on okay
let's do it torture test yeah torture test small fft there we go there we go
okay okay GPU okay CPU temps are immediately 100 we need to do something
here we ready yep
we go okay so we're still at 100° though oh
98 our main issue then is basically just
that we don't really have fans directly on our heat sink the biggest problem is
you have too much back pressure into the fan it's not liking it oh really yeah we
don't have enough throughput need more power yeah I think
we need more power so I turn it off now
yeah that was 2% power right okay I'm
just about to hand you the remote for the full perc power nice we're going to
put a current clamp on here you cannot go over 100 because 100 amps is all that
we can measure wait are we not going to talk about the fact that that door is
open uh and that garage door is open
because we are going to be generating enough air flow through this room that
that's a legitimate concerned we bent the doors when we had the doors closed
yeah we had the we blew out there we blew the air out of that door and these
ones right here went and we like oh let's not do that y okay we ready okay
that's 5 amps 5 amps yeah and we can do
20x this
yes okay that's 7 amps we're already
down not thermal throttling anymore let's try to get to 10
wow she's real touchy okay we're at 96°
temps are going down you guys want to go
to 20 ABS
sure wo it's cooling that's for sure okay 30
amps wow
she goes boys
40 50 wa look at the cables
go
70 how are temp
Alex ADM
our CBL have lifted off W this is unreal at the
100x
how cut it cut it how hot are the batteries they're
fine 40 43 it was drawing 300 W an air cooler
and it was only hitting 94°
okay round two without the
computer okay woo and legistics was so concerned about
the CPU so can I pitch a crazy idea yes
can we put the battery pack here in the flow of the air in the path of the airf
flow rather 100 amps then that was like
a third power bit above that not about that what
the hell
okay what are we at that's 10 amps and without the comp
wow without the computer in the way she
goes wa this kind of shows you how fans can
be optimized for either airf flow or
static pressure this is clearly all about that airf flow no treble okay now
here's something I want to know
oh you guys lying I can feel it 100%
coming through here can you see my hair moving hold on I'm going to give it a
little more this is at the back
door W
okay
on that's only 60m
wow I have never seen anything like it
how high did we get 60 yeah that's a fifth of full power okay we going again
you guys want to go full boore I've been informed that when we're
running at full boore I am not allowed to stand behind it something something
keyman claw something liability anyway
the point is I'm going to put this wig on my mop head here and see if I can
even hold it in place I mean that's basically Linus
right 10 o 20 30 that's a 100
what
wow all
doorway W wo it's all smoking get
out like take the whole thing you can't
um smell through the camera but I assure you it smells a lot don't do what we do
yeah please don't if you guys enjoyed this video you might enjoy the one where
Alex and I used a different fan to cool a computer and it blew the top off or
you might enjoy the one where Colin and I tried to uh make a battery out of
18650 cells that one also involved fire and that door and disposing of batteries