This video is sponsored by Brilliant.org but more on that later
In the last episode make it real we made a jet-powered bike now it's time to see
How fast it can go
All right so we can't actually test this on the road because obviously it's quite
illegal to use a jet engine powered motorcycle in the city streets but we
did drive it around and get some people's reactions
Now before we test it out we thought would be kind of cool to see what the
public's reaction to our invention would be. So we took it to a local bike night
to see what other bikers thought about it
Now did you notify your insurance, that you have a jet engine on your bike?
What the heck is this?
It's a jet Engine.
There's a little electric motor in there get in the front so it spins it up and
it goes through a cycle
Literally 75 pounds of pushing you. non-stop.
Need a lighter buddy?
All right so to test it to its full capability we're gonna take it to a drag
strip and see what it can do on the quarter mile.
The drag strip we're going
to is called the Grand Bend Motorplex and it was actually pretty reasonable to
rent for a few hours
A quarter-mile drag strip a CBR 250 and a jet engine.
All right so we're here at
Grand Ben Motorplex and we're about to test the jet engine powered motorcycle
Big thank you Knox they provide us with some awesome motorcycle gear to make
sure Ian doesn't get hurt in the event of some kind of catastrophic accident
Feel safe I feel safe.
He feels safe let's do this!
All right.
What's next?
Well we're actually gonna do three tests
Three tests.
We're gonna run it just the bike then we're gonna run it
just the jet and we're gonna run both.
So obviously both together is gonna go the fastest
But the real question is can the bike in neutral with the jet engine go
faster than the bike with the engine?
That's that's the real test here so
let's see what happens.
So what's going on here?
let's take a look at a free body diagram to help explain the physics behind the jet bike.
FG is the force of gravity FN is the
normal force counteracting gravity. FF is the force of friction which is mainly
wind resistance this is proportional to the square of velocity meaning the
faster you go the larger the force. F motorcycle this is a forward force the
motorcycle of the engine turning wheel as you increase gears to go faster this force drops.
F jet we know the thrust of this jet is about 310 Newton's or 73 pounds
The cool thing about this is there are no gears just a constant force
this means there will be a slow acceleration at the beginning but the
force won't be reduced by changing gears.
If the force of the motorcycle is larger
than the force of friction then the bike accelerates until an equilibrium is met.
Unfortunately the track isn't long enough for us to actually hit the top
speed and we don't want to hit the water barrels at the end of the track.
If you guys want to learn more classical mechanics like this Brilliant.org has
Some great interactive courses on the subject very similar to what we studied
during our engineering degrees. Brilliant .org is a problem-solving site that helps
you think like an engineer. By guiding you through problems that bring you from
knowing nothing to having a deep understanding the topic. If you want to
learn and understand the physics of everyday life and support our channel at
the same time go to brilliant org/hack smith and sign up for free the first 200
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All right that was friggin awesome! The jet engine by itself in neutral
didn't make the bike go too fast I think we almost said 90 maybe a hundred
kilometers an hour very good 100 all right it hit 100 km/h
with the bike in neutral and then with the bike on plus the jet engine I think
we did what one sixty?
One sixty yeah.
Probably could have went faster but.
We were running out of strip.
Definitely felt a lot better with the jet going.
Did it Satisfy your need for speed?
Almost.
With a jet like you're flying through the gears and you
just feel like you got some oomph in between.
Like having an after burner or something.
Yeah but we did have a few issues in the jet engine
starting up. Something's going on with the fuel pump.
So the fuel pump
wasn't going the engine wasn't starting. So we sat there for an hour ran out of time.
So we can't do any more runs unfortunately otherwise we'd probably
get a bit better speed.
Yeah literally literally you guys got the jet engine
Working with five minutes left on our rental time for the the track which
Which kind of sucks but when we put two jet engines in the MGB yeah we'll come back
Yeah big THANK YOU to Knoxx Outerwear for providing Ian with some safety gear.
See it's pretty durable.
plus these jeans like Kevlar in them so if he actually went sliding
Hypothetically, dyneema. Dyneema sorry not Kevlar, very similar.
But hypothetically if he went sliding he wouldn't get too much road burn.
You have four seconds.
Four seconds.
You better hope you stop in four seconds.
Did you guys get it running?
Five minutes left.
Did I miss it?
You were suppose to be filming dude.
did you did you not get the shot?
No I can't hear anything from down at the other end!
What? You didn't get the shot?
The only thing we didn't bring was walkies.
You're Fired.
well we hope you guys enjoyed that video we had a lot of fun renting out a drag
strip for the day to test out the jet bike but what do you guys think we
should add the jet engine to next? What other vehicles do you think would be
much better with a jet engine? I think we're gonna add to the spy car but
if you guys have any ideas of crazy jet-powered inventions let us know in
the comments below thanks for watching
Oh