Jonny69's inventing shed: Jet scooter

Jonny69 · 20-05-2009, 12:03

Following on from my spudmatic gun I'll move onto my jet scooter. I built a large-ish pulsejet as part of my final year project at university. It's made from mild steel pipe and rolled sections with a 2" exhaust. It runs on propane and output is about 15lbs of thrust I think, can't remember. Naturally with a jet in the shed you need a scooter to put it on so I lengthened one of those metal kick scooters and mounted the jet on the back. This is what I ended up with:

Note how there's no throttle and no brake. Power is controlled by winding in the regulator which is about 5 turns from off to 4 bar of gas pressure:

Noisy end where all the fire comes out:

Intake, sucks the hairs off your legs:

And as with most of my toys it folds up and neatly stashes in the corner

Here's a youtube video of some early testing. It's all the footage I have but the jumping camerman who starts to back off when I wind it up gives you an idea how loud it is!

Running procedure is sparkplug on, gas on, shoot some air in the front with a leaf blower to start it, turn the sparkplug off and wind the gas up. At the end you see a shower of sparks fly out the front and the motor stops. This is the valves destoying themselves before I had found suitable material for them and I experimented with a tuned valveless intake for indefinite running. Short video here:

How does it go? Well it makes a proper load of noise, glows red hot, there's fire, explosions and a real risk of getting hurt. It doesn't actually go all that fast because it doesn't have a huge amount of thrust for the weight of a person. I have ridden it and slipped off and when the weight is off the deck it tries to fly off. So consider this the mk1 and there's a mk2 in the pipeline with brakes, proper throttle control and somewhere better to stand. And a little more thrust of course

Burble · 20-05-2009, 12:11

I want to come around to play!

Will · 20-05-2009, 12:14

semi-pro waster · 20-05-2009, 13:48

Will you use the higher powered version for getting around Le Mans?

Jonny69 · 20-05-2009, 13:59

It may be going there

Admiral Huddy · 20-05-2009, 16:10

You have too much time young man..

Desmo · 20-05-2009, 17:07

Quote:

Originally Posted by Burble

I want to come around to kill myself!

IainB · 20-05-2009, 17:36

You sir are a NUTTER

Can I have a go....please?????

Darrin · 20-05-2009, 18:39

Don't let my son see this...

A Place of Light · 25-05-2009, 19:40

Pulse jets are great.
Now the development model is done, it's time to build bigger versions right?

20-05-2009, 12:03	#1
Jonny69 Noob Join Date: Oct 2006 Location: Socialist Republik of Kent Posts: 5,032	Jonny69's inventing shed: Jet scooter Following on from my spudmatic gun I'll move onto my jet scooter. I built a large-ish pulsejet as part of my final year project at university. It's made from mild steel pipe and rolled sections with a 2" exhaust. It runs on propane and output is about 15lbs of thrust I think, can't remember. Naturally with a jet in the shed you need a scooter to put it on so I lengthened one of those metal kick scooters and mounted the jet on the back. This is what I ended up with: Note how there's no throttle and no brake. Power is controlled by winding in the regulator which is about 5 turns from off to 4 bar of gas pressure: Noisy end where all the fire comes out: Intake, sucks the hairs off your legs: And as with most of my toys it folds up and neatly stashes in the corner Here's a youtube video of some early testing. It's all the footage I have but the jumping camerman who starts to back off when I wind it up gives you an idea how loud it is! Running procedure is sparkplug on, gas on, shoot some air in the front with a leaf blower to start it, turn the sparkplug off and wind the gas up. At the end you see a shower of sparks fly out the front and the motor stops. This is the valves destoying themselves before I had found suitable material for them and I experimented with a tuned valveless intake for indefinite running. Short video here: How does it go? Well it makes a proper load of noise, glows red hot, there's fire, explosions and a real risk of getting hurt. It doesn't actually go all that fast because it doesn't have a huge amount of thrust for the weight of a person. I have ridden it and slipped off and when the weight is off the deck it tries to fly off. So consider this the mk1 and there's a mk2 in the pipeline with brakes, proper throttle control and somewhere better to stand. And a little more thrust of course __________________

20-05-2009, 12:14	#3
Will BBx woz 'ere :P Join Date: Jan 1970 Posts: 2,147,487,208	__________________ *No No!*

20-05-2009, 13:48	#4
semi-pro waster Provider of sensible advice about homosexuals Join Date: Oct 2006 Location: London Posts: 2,615	Will you use the higher powered version for getting around Le Mans? __________________ "Your friend is the man that knows all about you, and still likes you." - Elbert Hubbard

20-05-2009, 13:59	#5
Jonny69 Noob Join Date: Oct 2006 Location: Socialist Republik of Kent Posts: 5,032	It may be going there __________________

20-05-2009, 16:10	#6
Admiral Huddy HOMO-Sapien Join Date: Jun 2006 Location: Chelmsford Posts: 6,692	You have too much time young man.. __________________ I just got lost in thought.. It was very unfamiliar territory. Techie Talk \| My gaming Blog \| PC spec \| The Admirals log

20-05-2009, 12:11	#2
Burble Rocket Fuel Join Date: Jul 2006 Posts: 7,826	I want to come around to play!

20-05-2009, 17:36	#8
IainB Long Island Iced Tea Join Date: May 2009 Location: South Beds Baby Posts: 143	You sir are a NUTTER Can I have a go....please????? __________________ www.imc-racing.co.uk and www.djiainb.co.uk

20-05-2009, 18:39	#9
Darrin Dirteh Kitteh Join Date: Jan 2007 Location: Hiding out in Mormon Country Posts: 1,629	Don't let my son see this... __________________ A bullet may have your name on it, but shrapnel is addressed "to whom it may concern".

25-05-2009, 19:40	#10
A Place of Light Absinthe Join Date: Dec 2007 Posts: 1,247	Pulse jets are great. Now the development model is done, it's time to build bigger versions right?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode