try a reed valve as the intake. It's a one-way valve and is mechanical so it works at microsecond pulses perfect for a pulse jet engine, you also might want to find a way to aerate the fuel into the combustion chamber, the smaller the particles of fuel, the better it burns. *Mixing an oxidizer like nitrous into the fuel could also singlehandedly fix your issues*, so you can try it first since it is cheaper than changing your engine up
Reed valves are off. Either leaking or too loose. They flutter. Also, less pressure might work with the starter air. A big spark gap, a high voltage source. Up the gas tank because you'd want it to run for more than a minute.
I know the reeds are tight because I made sure they were aligned and tight before I tried running it. But they could be leaking. Not sure how though, it’s all brand new. I’ll have to figure out how to see if they’re leaking. Maybe blow air from the back and see if any blows through. Thanks for the suggestions.
6:41 I understand the basic physics of combustion engines but I don't know too much pulse Jets. If I had to guess Id think it just might not be getting enough air to let the fuel combust. Although I don't know how you would fix that honest the easiest way I can think of is just mix in engine grade nitrous (actually cheaper than you would think)
Also running the spark plug at full blast the entire time might just not be letting enough fuel to actually get into the combustion chamber before it just burns although you would need actual electronics if that's the case
the fuel mixture may be to rich and it looks likes you don't have a valve that opens and closes with the combustion and exhausting. the valve should close due to the combustion and open when the exhaust takes place, so that's probably why you require such pressure because the back pressure from the combustion is fighting the intake air, so try like a butterfly valve or any valve that can flap open automatically when the pressure is low on one side.
I did not know you are using gasoline. Thought it was nitro fuel like for r/c planes. So I'm thinking its running really rich. Got to lean it out. Maybe a smaller fuel line or you can get a adjustment clamp for the fuel line that might help.
You may be on to something. I did notice it was closer to running on the first attempt where the tank was lower. I thought it couldn’t suck enough fuel so I raised the tank to make it easier to get fuel. So maybe I just need to lower it more than it was. The lower the tank, the harder it is to suck fuel, so it would get less fuel. That might also stop the dripping at the front.
There is a lot of things it could be. Maybe even the spark plug is not the right one. Maybe you need a hotter plug. What kind of gas you are using regular, mid grade or high test!
Could it be a fuel supply problem ? you mentioned it was a tank designed to be pressurized , did you pressurize it ? if not could the amount of fuel being sucked through the venturi by the high pressure air be causing a low pressure in the tank stopping fuel from flowing when it is shut off?
The tank was vented. If I lift the tank higher than the intake, it just runs out and makes a mess. If I pressurize it, it would make a bigger mess. It is possible though, that the Venturi shape isn’t correct. It seams like it can’t suck enough air in on its own. I think it gets plenty of gas as long as I’m suppling the air. I think? Thanks for watching and commenting!
Looks (and sounds) like fuel deprivation. These Hobby King pulsejets are notoriously lacking in quality control. Yours seems to have been welded by an amateur, but that should cause any problems, it just makes it ugly. However, they sometimes come with the wrong fuel metering adapter (the brass nipple connecting the fuel line to the injector). Make sure the hole is 1mm. If it's smaller, you'll need to drill it to 1mm.
About the only thing I know for sure, is that it is the correct fuel. Everything I read and saw said to use normal gasoline. It was dripping less on the first attempt, and was closer to running. So I think it was just getting too much gas, causing the excess to just drip out the front. I think. Thanks for watching and commenting!
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try a reed valve as the intake. It's a one-way valve and is mechanical so it works at microsecond pulses perfect for a pulse jet engine, you also might want to find a way to aerate the fuel into the combustion chamber, the smaller the particles of fuel, the better it burns. *Mixing an oxidizer like nitrous into the fuel could also singlehandedly fix your issues*, so you can try it first since it is cheaper than changing your engine up
It already uses reed valves.
@@customfabrications huh, that's weird, well maybe it's the fuel, or maybe the reel valves aren't pulling in enough air somehow.
Reed valves are off. Either leaking or too loose. They flutter. Also, less pressure might work with the starter air. A big spark gap, a high voltage source. Up the gas tank because you'd want it to run for more than a minute.
I know the reeds are tight because I made sure they were aligned and tight before I tried running it. But they could be leaking. Not sure how though, it’s all brand new. I’ll have to figure out how to see if they’re leaking. Maybe blow air from the back and see if any blows through. Thanks for the suggestions.
Looks like fun. I don’t see why it shouldn’t run.
Thanks. Me either.
6:41 I understand the basic physics of combustion engines but I don't know too much pulse Jets. If I had to guess Id think it just might not be getting enough air to let the fuel combust. Although I don't know how you would fix that honest the easiest way I can think of is just mix in engine grade nitrous (actually cheaper than you would think)
Also running the spark plug at full blast the entire time might just not be letting enough fuel to actually get into the combustion chamber before it just burns although you would need actual electronics if that's the case
12:17 well that just sounds like you're not getting enough fuel into the combustion chamber
Yea, it seams like it can’t draw in air on its own.it seams to ‘run’ as long as I’m suppling the air.
There’s plenty of fuel dripping out the front. Seems like I’m giving it too much fuel?
At one point I stoped the ignighter and it kept burning. So I don’t think that’s the case. But IDK.
the fuel mixture may be to rich and it looks likes you don't have a valve that opens and closes with the combustion and exhausting. the valve should close due to the combustion and open when the exhaust takes place, so that's probably why you require such pressure because the back pressure from the combustion is fighting the intake air, so try like a butterfly valve or any valve that can flap open automatically when the pressure is low on one side.
There are reed valves inside between the intake and combustion chamber. But I am starting to think that it may be too rich.
I did not know you are using gasoline. Thought it was nitro fuel like for r/c planes. So I'm thinking its running really rich. Got to lean it out. Maybe a smaller fuel line or you can get a adjustment clamp for the fuel line that might help.
You may be on to something. I did notice it was closer to running on the first attempt where the tank was lower. I thought it couldn’t suck enough fuel so I raised the tank to make it easier to get fuel. So maybe I just need to lower it more than it was. The lower the tank, the harder it is to suck fuel, so it would get less fuel. That might also stop the dripping at the front.
There is a lot of things it could be. Maybe even the spark plug is not the right one. Maybe you need a hotter plug. What kind of gas you are using regular, mid grade or high test!
It’s the plug that came with it. And it lights off ok. Just using regular gas.
Could it be a fuel supply problem ? you mentioned it was a tank designed to be pressurized , did you pressurize it ? if not could the amount of fuel being sucked through the venturi by the high pressure air be causing a low pressure in the tank stopping fuel from flowing when it is shut off?
The tank was vented. If I lift the tank higher than the intake, it just runs out and makes a mess. If I pressurize it, it would make a bigger mess. It is possible though, that the Venturi shape isn’t correct. It seams like it can’t suck enough air in on its own. I think it gets plenty of gas as long as I’m suppling the air. I think? Thanks for watching and commenting!
Is the reed valve set over holes correctly covering them. What fuel you using
Yup, I made sure the holes were centered under the reads. And I’m just using gasoline. That’s what everything I read said to use.
Looks (and sounds) like fuel deprivation. These Hobby King pulsejets are notoriously lacking in quality control. Yours seems to have been welded by an amateur, but that should cause any problems, it just makes it ugly. However, they sometimes come with the wrong fuel metering adapter (the brass nipple connecting the fuel line to the injector). Make sure the hole is 1mm. If it's smaller, you'll need to drill it to 1mm.
Thanks, I’ll check the hole size.
Why would it be dripping fuel? Maybe wrong fuel?
About the only thing I know for sure, is that it is the correct fuel. Everything I read and saw said to use normal gasoline. It was dripping less on the first attempt, and was closer to running. So I think it was just getting too much gas, causing the excess to just drip out the front. I think. Thanks for watching and commenting!
Does this thing need 1.21 giga watts to run?
Yes, but my gigiwat meter batteries are dead.