Well a long weekend here in West Aust for Labour Day.
I'm always bored, when there is not any wind.

This is why I love what “justoeduardo” has been constructing. His designs are fantastic and fun to watch his video clips too.


So had a brain wave. (Now there in itself, lies the problem eh?)

No wind, I reckon I could fix that.

So off to the man cave. With much measuring, calculating, cutting, welding and bashing, to come up with my solution to this never ending problem.

Hope this sorts out my dilemma.

I have taken all the precautions, hence my protective gear. Ha ha.
Got to be careful, I can't afford to lose any of the hair I have left.

Aw, come on……………… The pressure stamp on the cylinder is still in date!!!



It's a 12 pound thrust, LPG/petrol fueled, "Thermo pulse" valveless pulse jet.
It should fire, 1230 times (hertz) a second at 130 decibels, at full power and consume 16 kgs of LPG an hour.

Might just wait till the wife goes shopping before trying this little number.

UMMMMM chook- do you have any idea how loud a pulse jet is?

We made a conventional pulsejet (reedvalve thingy at the inlet)
Combustion chamber was IIRC 100mm diameter, whole thing was a bit over a metre long.
Bolted to a steel workbench, being environmentally friendly we used unleaded fuel, aerostart and compressed air to get it started, ignition was a sparkplug and magneto to begin with, changed to something else later on for a reason I cant remember.
Got it running and with a bit of fine tuning the bench started sliding across the workshop floor, stopping only when the fuel hose kinked.

The workshop was on Collingwood street osborne park.
Our pulsejet could be heard on the freeway.

Stephen

Now chook you have started something. I think we should look at some wacky machines.
Mmmm I have an ultralight motor wonder how I could fit it to a yacht maybe for lefroy

vic

I think that would be the way to go. dam it chook I wanted a rest.

whoa .lotsa trust in that gas bottle dude (rite nexta da family jewels)
wicked .love it

Ya crazy basket
Just a small point, actually two points.
Where is the bleeding brakes?
How ya starta de Eng ?

Isnt it just bloody huge us blokes never actually grow up

^^^^^
Even more fun now, no brakes to write home about
I need to figure out a reason to drive to Esperence to see Chook2 run this thing.

UMMMMM chook- do you have any idea how loud a pulse jet is?

Ahh yes Stephen, I've built a couple of reed valve pulse jets, but that was years ago.

They sounded like one long continuous shotgun blast at full power.

Should be a great counter measure for my neighbour's loud parties.
This should drown them out eh.

Would have been handy last Easter at Lefroy when the yobbos cranked up in the camp across the way from the yachties after midnight.

One of my friends said,
How to check if chook has tried it? Check his eyebrows.[}:)]

Glad it stimulated some action on the forum I'll keep you posted. If I live long enough!!!!

Chook, I recommend using the apprentices as test pilots. [}:)]

OK! Chook,
So when you gonna fill a whole bunch of balloons with Hydrogen and Fly the whole thing above Lake Lafroy?? Yu Bleedin Nong!

I said Land Yachting should be a bunch of fun and forget the politics not turn it into an attempt at the Darwin Awards..
Ron

I think you will melt the plastic gas pipe where it runs into the induction pipe.
The last half metre or so needs to be something which will take a lot of heat.
But so far I like it.

Not sure that a rotisserie will keep up, Landyacht.


Yeh just having a bit of fun with the photo on this one.

There is a LOT of tongue in cheek, in the photo where I hammed it up for ya.

If you look at the video the LPG is injected into the intake. It's done with a stinger/diffuser on the end of a steel line running away to the gas source.
If you look closely at the photo, where I have the orange gas line connected, its where the petrol will be injected with a spray bar.
So it's a LPG ignition, using an ignition source to the sparkplug at the front, then warm up at idle and then petrol is introduced till the power increases and then the LPG is turned off.
It fires, combustion expands the gases and expels them out the exhaust/tail which causes an internal vacuum which sucks in a new charge and on it goes. 1230 times a second so it's a resonance thing. The tail will be trimmed back slowly after each run till the right frequency is obtained. This is due to small differences in the build of each jet engine.

Not sure when I'll get to run it. It's on hold while the wife checks my life insurance is up to date. When I see her booking her overseas air ticket I'll know she has it sorted.

There is no way I'll be anywhere close to this while it's running. It's only 12 pounds of internal pressure till it backfires. Just a big spud gun then!!!!
It's mainly turning fuel into noise.

With earplugs and muffs over them, you will still get a headache as the noise goes through your skeleton if you're too close to them while they are running.

I'm building the ignition system at the moment, so it may take a while till the test day.

He he, yes Stephen it's a poor day you don't learn something new.

Lots of great fun to be found on the net, (that's how you guys have ended up with me here). If you take it all with a touch of salt and only believe half of what's quoted your pretty close to the money.

only 12 pounds?

Yeh it is a fair bit of work to hammer out the cones to a nice shape. They have to conform to a pretty tight tolerance. Even the weld that encroaches inside each joint has to be removed. So I've realized I'll get this one up and running before I go overboard.[}:)]

Don't worry, I've checked out the power restriction, but it's a lot of work to improve it.
My jet is 1400mm long and this is what you can do to upgrade it.
Looks like a fair bit of work though.



Chook

Oooooohhhhhh................ I'm in Luv.

Chook2 said...

Oooooohhhhhh................ I'm in Luv.

I can almost see Chook commuting to Esperance Ag. on a pulse jet bike!!

with the local fireys following, and Mr Plod not far behind

stephen

Too hot at 39.5 degrees today, for testing. I'm getting too soft. After welding at work today, I'm cream crackered.

Rest assured you guys will be the first to know how it performs.
Oh.............. other than my immediate neighbours.[}:)]

and yes we do get "Scrapheap Challenge" on ABC2, but I had missed that episode.
Thanks, I really enjoyed that. Lisa's a spunk.

Chook.

Try companies that deal with Classic Cars - like old MG's (had a cousin in Taz that used to restore MG's for a living). It's this distance thing again - I've got a pile of them in the garage from converting old cars to electronic ignition. Other option is....lawnmowers, I've used the full ignition system on model engines.

Cheers Col