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!

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?????

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..

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, 17:36	#4
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, 12:14	#5
Will BBx woz 'ere :P Join Date: Jan 1970 Posts: 2,147,487,208	__________________ *No No!*

20-05-2009, 13:48	#6
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	#7
Jonny69 Noob Join Date: Oct 2006 Location: Socialist Republik of Kent Posts: 5,032	It may be going there __________________

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, 16:10	#8
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, 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?