Lockwood Hiller Pulsejet *almost* running
Posted: Wed Dec 23, 2020 12:25 pm
Hello all,
I am Tom from buildcomics.com. And this is the story of my first pulse jet (so far).
I built it from stainless steel 1.5mm thick tubing. These are the dimensions:
It's based on the 55lbs Lockwood HIller Valveless Pulsejet design by Bruce Simpson, with the ONLY difference being my combustion chamber is straight instead of slightly smaller at the exhaust end.
This is the actual thing: This is what the fuel injector (now) looks like. It is a (rather big) 20 or so millimeter tube that sits just a bit into the entry of the combustion chamber. Having about 10 times a 4mm diameter hole into it at various angles, pointing down and inwards to the (rest of) the chamber.
To assure you there's no regulator, this is the attachment to the 10.7 Kg Propane Gas Tank (going into 6mm hose and to the fuel injector)
So I tried starting it with a compressor first, without much luck. Got myself a leafblower (3kw) and got much closer to running the thing:
https://www.youtube.com/watch?v=fDv8bUxbHfg&t=24s
But not close enough unfortunately. And in the end I had to give up because my leaf blower attachment melted away:
So that's where it's at now. Almost running, but not quite. The question for you here is, looking at all this, any tips to get this thing running? What could I do to run this better? Might it be:
1. My starting technique?
2. Fuel Injector?
3. Not enough fuel going in (try to run it on liquid?)
4. Is the straight chamber really an issue?
5. Something else?
I am Tom from buildcomics.com. And this is the story of my first pulse jet (so far).
I built it from stainless steel 1.5mm thick tubing. These are the dimensions:
It's based on the 55lbs Lockwood HIller Valveless Pulsejet design by Bruce Simpson, with the ONLY difference being my combustion chamber is straight instead of slightly smaller at the exhaust end.
This is the actual thing: This is what the fuel injector (now) looks like. It is a (rather big) 20 or so millimeter tube that sits just a bit into the entry of the combustion chamber. Having about 10 times a 4mm diameter hole into it at various angles, pointing down and inwards to the (rest of) the chamber.
To assure you there's no regulator, this is the attachment to the 10.7 Kg Propane Gas Tank (going into 6mm hose and to the fuel injector)
So I tried starting it with a compressor first, without much luck. Got myself a leafblower (3kw) and got much closer to running the thing:
https://www.youtube.com/watch?v=fDv8bUxbHfg&t=24s
But not close enough unfortunately. And in the end I had to give up because my leaf blower attachment melted away:
So that's where it's at now. Almost running, but not quite. The question for you here is, looking at all this, any tips to get this thing running? What could I do to run this better? Might it be:
1. My starting technique?
2. Fuel Injector?
3. Not enough fuel going in (try to run it on liquid?)
4. Is the straight chamber really an issue?
5. Something else?