How To Start A Valveless Pulse Jet Engine

This tutorial video shows the equipment, and procedure used to start a small valveless pulsejet. The engine was custom made with integrated mounting system and fixed position fuel injector.


The engine is a valveless pulsejet with no moving parts, and easily self starts on propane, just turn on the ignition and turn on the fuel....

A valveless pulsejet is a unique type of engine with no moving parts. Unlike ramjets, which must have air blown into them at high speed, either by a blower or by traveling very fast, pulsejets can run while completely still.

They can be throttled typically between 10% and 100% thrust in the blink of an eye, and dont require any spool up time like turbines or turbojets.

Because they have no moving parts, valveless pulse jets are much easier to own and operate than RC turbines. For the cost of a ducted fan setup, you could have your own real, high speed RC jet plane.

The truth is that by the time you add up turbojet planes engine weight, fuel and oil pump weight, the computerized control system, and any onboard starting systems, you not only have a small fortune invested in the plane, but its also quite heavy. Pulsejets can be made extremely light weight, and even valveless engines are capable of pumping their own liquid fuels by the venturi effect. All you then need is your standard reciever and servos and a small battery to power it, rather than a large battery to power a fuel pump.

Category:

Science & Technology

Tags:

• Starting
• Valveless
• Pulsejet
• Pulse
• Jet
• Engine
• RC
• Turbine
• Turbojet
• Ducted
• Fan
• Gas

[fffeeerrr06]

bout how many lbs of thrust does it produce?

[BeckTechnologies]

about 4 lbs thrust.

[BeckTechnologies]

A gokart? not really. I put one on a bike before but it was very underpowered.

[BeckTechnologies]

yep, as long as it produces a good hot spark it will start any pulsejet just fine. Older magnetos tend to be weaker, and you usually need a higher rpm drill to increase the output.

[N37BU6]

You have a "CBC Radio" voice...

Canadians who listen to AM radio at strange hours will appreciate that comment. :)

[UncleSam493]

dumb question but why does the spark not travel back up the fuel line?

[Mr3wheeledbike]

what a simply great idea weed eater i am using that you said this was on a bike what size engine would work best

[Mole16man]

@MrSDub22 Look up the V1 flying bomb from the second world war, that used a valveless pulse jet engine!

[Mole16man]

@UncleSam493 It would need to burn to travel back up the fuel line, and without any oxygen in the fuel line it would not be able to :)

[tubecruser]

i thought that you did not have to use compressed air

[LittleBigManChannel]

Could you send me the plans or something?

[TylerTheStyler]

can you do a tutorial on how to actually Build the pulse jet

[mikitymike]

@UncleSam493 there is no oxygen there, the fuel line is full of... fuel.

[erwtenzuiger]

won't the sparkplug melt or something when you leave it on longer?

[MrSDub22]

@econoroller that's exactly what the military uses them for and exactly why,THEY ARE STEALTHY QUIET AND EFFICIENT- and they dont run on propane- Propane is very inefficient- the noise can be contolled by adding another tube around the outside/ and the materials it is made out of....THE MILITARY HAS BEEN USING THIS TECHNOLOGY SINCE THE 1950's.....LOOK UP the U-2 Spy Plane...it has about 15,000-17,000 lbs of thrust or 528 mph (roughly)

[SAMKUANKENT]

sounds like f1 engine