big lockwood style plans see if you think it will work

[keith mcconnell]

Here's a drawing of a big lockwood style pulse jet. This is my first attempt to draw one. Please take a look and tell me if you guys think it will run.

Thanks,

Keith McConnell

[keith mcconnell]

here's the file. I think. Sorry.

[metiz]

add a flare of D=5.174 L=0.86 and it should run and produce a decent amount of power. This is asuming you did not simply scale up an existing model example: X2. the numbers you have chosen seem extremly exact. Sorry I couldn't help with the chinese. It was out of my hands and shit went "tits up" pretty fast.

[keith mcconnell]

Thanks. No problem with other engine, I understand. I got the CC numbers from Beck's pulsejet engine calculator for 100 pound thrust engine and used ratios that are in Bruce Simpson's book to get the other dimensions. Just wanted to see what everyone thought before I started to build it.

Thanks again,

Keith McConnell

[metiz]

Ok cool.

These engines consume vast amounts of fuel and a lot of it is wasted through the intake, by design. If you want to recoup some of that engergy, add an augmenter to the intake. It will increase your power output by about 20% for no extra fuel

[keith mcconnell]

Do you think this thing will make 100# of thrust. Also I plan to use two fuel injectors like the ones Bruce Simpson uses. One will be propane to start the engine and the other will be for gas after it is warmed up. Also does the CC need to have a taper to it? I've got it straight now. The lockwood that I build before had a taper. I just did not know how to come up with how much taper or if it was important.

Thanks,
Keith McConnell

[metiz]

judging by the size of the cc and all other things being of the right proportions, your engine will reach 100 pounds no problem. if you add an augmenter you'll get 120+ pounds, of course. I'm not to sure about the taper. I think it reduces unwanted resonance frequencies in the cc messing with the combustion process. Don't worry about it, it's not that important

[55dcyinely]

Luck is on your side! If you build it! It will run! Hell, just have fun building it.
Even some of the ones I build with "NO PLANS!" RUN.
Lockwood PULSE JET 20 gauge mild steel slip rolled. 77" Long, 4-1/2"OD Intake with a Maddox Silencer, 24"L X 11"W combustion Chamber and a tail pipe 3"OD to 7"OD Exhaust

Lockwood: I haven't measured the thrust. But I'm guesting +50 LBS

Back ground pitcher of Lockwood Pulse Jet built from an exhaust system off a semi truck.
And foreground this little Chinese 2LB thrust. Hard to start, but runs.

Ugly Lockwood background

And I can usually count on, for every pound it weights double that in thrust!
What the HELL! I might even mount it to a Skateboard.

Skateboard

SB.jpg (8.64 KiB) Viewed 14425 times

[metiz]

Nice pics!

when are you planning on building thr big lockwood?

[55dcyinely]

Nice pics!

when are you planning on building thr big lockwood?

Hi Metiz,
HUM MM It's still in the planning stages. I read an article about a father and son team that built a Lockwood PJ with 55 gal. drums. They even had pics of it.
They were planning on running it down an abandoned RR Track until the local authority's caught wind of it. I'll see if I can't find it again.

[keith mcconnell]

I got my SS u in today. Now if I can find sheets of 321 SS I'll be ready to start building.

[keith mcconnell]

Here a drawing of the fuel nozzel for the pulse jet. This one will go in the combustion chamber for gas and there will be one in the intake next to the cone going to the combustion chamber for propane. I'm going to try to start on propane and then switch over to gas. Let me know what you guys think.

Keith McConnell

[keith mcconnell]

got most of the pulse jet tacked up today. I'll set up the purge tomorrow and hopefully get some welded and maybe have it finished next week.

Keith McConnell

[Mark]

321 It's a good choice in materials science.

[keith mcconnell]

Unfortunately I was not able to get 321 but had to settle for 316L.