hello everyone and welcome in this video
we're going to be trying to figure out
why the konig segregate doesn't have a
transmission and in order to do this
we're going to try and figure out you
know what speed can this thing still
spin the tires and so you know to to
spin the tires first of all we need to
know the weight distribution of the
vehicle
and basically to find the maximum force
that the vehicle can apply without those
tires spinning use that simple equation
f equals mu coefficient of friction
times the normal force and so we're
going to use a conservative estimate of
a weight distribution of 40 60 split
it's probably a little bit closer to 50
50 i would imagine uh the aguero r is
4456 but they don't release this number
so we're just going to guess 60 of the
weight is sitting on the back and to
calculate our force at the tires for the
rear tires 1.1
times 0.6 60
times the weight of the car 3589 pounds
or 1628 kilograms so this gives us a
force to spin the tires of
2368.7 pounds or
10.536 kilonewtons now the next thing we
want to do we're just going to choose an
arbitrary number 160 miles per hour and
see if it can spin the tires at this
speed
using just this single gear
this is equivalent to 260 kilometers per
hour so we're going to calculate the
force of air resistance and we're going
to calculate the force of rolling
resistance here's the equation for force
of air resistance that comes out to be
2434.8 newtons
we're going to be using a coefficient
drag coefficient of 0.37
the koenigsegg ccx is actually 0.32 this
is from the aguero r they don't release
the regera numbers but so conservative
0.37 and for the frontal area we're
going to be doing width times height
minus ground clearance and so that's
also going to be a conservative estimate
2.1 meters squared the ccx has a frontal
area of 1.87 i would imagine the regera
is actually a bit less than 2.1 it's not
just a block driving down you know it
has a shape to it
so conservative 2.1 meter squared that
gives us this force of 2400
newtons we want to add to that the force
of rolling resistance so these are
things pushing the vehicle back uh while
it's driving at 160 miles an hour the
rolling resistance comes out to be a
coefficient of rolling resistance times
the normal force i used 0.015 this is a
conservative high number assuming sticky
tires that gives us
239.56 newtons so really the two
important things we've learned so far we
need this much of a force in order to
break the tires free
and here's how much resistance we have
at 160 miles per hour just from arrow
and rolling resistance
2674.3 newtons or 600 pounds so in order
to spin the tires at 160 miles per hour
in other words do a burnout at 160 miles
an hour we add these two numbers
together 10 000
536 newtons plus 2
674 newtons and that gives us 13
thousand
uh 210 newtons or
2970 pounds of force needed in order to
break those tires free okay so does the
engine have that much power as the next
question so we're going to look at wheel
torque at 160 miles per hour
now koenigsegg does reveal that at 8 250
rpm you will be at 249 miles per hour so
160 miles per hour you can just do a
simple ratio 160 times 8 250 divided by
249 so 160 miles per hour you're
spinning at 5
300 rpm so how much torque are we making
at 5 300 rpm well they do provide a
torque curve and so you can see that's
about 12 000 or 1250 newton meters
okay great so we take that 1250 newton
meters that's from the engine that's
going to be multiplied by the final
drive ratio before getting to the wheels
final drive ratio is 2.73 there have
been other statements with koenigsegg of
it being 2.85 but the latest on their
website says 2.73 so that's what we're
going with 1250 times 2.73 3412.5
newton meters and in order to find the
force at the tire we take the torque at
the axle that 3412 newton meters and
divide it by the radius of the tire
0.357
meters
this gives us 9545.32
newtons or
2145 pounds now you can see that that
number is less than this in fact it's
about 72 percent of this number so with
the engine alone you will not be able to
spin the tires up however the engine
provides 1250 newton meters the electric
motors which there are three of on this
vehicle provide an additional
newton meters of torque so if you look
at the combined torque curve it's going
to look something like this
where you have significantly more wheel
torque than just what the engine is
provided obviously because you've got
those electric motors adding in that
additional 900 newton meters so if the
engine is only providing 58 of the
torque but able to provide 72 percent of
the torque needed to spin the tires at
160 miles an hour what did we learn well
with that additional electric torque you
could indeed spin the tires at 160 miles
per hour
now this is also taking into
consideration using a conservative
weight distribution a conservative drag
coefficient a conservative frontal area
and a conservative rolling resistant
coefficient so it's probably actually a
bit easier to spin the tires than i
predicted here mathematically uh and so
what's really cool about this if this
vehicle has enough torque in a single
gear to spin the tires up to 160 miles
per hour that means if you were to use a
more aggressive gear below that say
first gear and then shift into this gear
there's no point because below 160 miles
per hour you're still able to spin the
tires you're able to apply the maximum
force to the ground so gearing gives you
no advantage and this allows you to go
all the way up to 250 miles per hour
which is the vehicle's top speed it may
be able to get slightly higher with a
different gear ratio maybe not point is
there's no need for additional gears
because it can spin the tires
up until such an enormously high
speed so you don't need those additional
gears very cool and there's actually a
statement of christian von koenigsegg
saying this vehicle can spin the tires
up to 160 170 miles per hour and that's
why it doesn't need gears i just wanted
to mathematically prove it this wasn't
indeed a arbitrary number i did choose
that because he said it and i wanted to
see if the math checked out so thank you
guys for watching and if you have any
questions or comments feel free to leave
them below
you shouldn't doubt uh mr koenigsegg i
wasn't doubting him it's just kind of
cool to see the math behind it i was
sure he was accurate in his statement
he's a pretty smart dude