Rocket pulsating sound?

Hi everybody.

Question, does your rocket have a pulsating sound? like when you drive with the window partialy open for example.

Thanks.

Max.

Can you please post a video, I would like to evaluate this.

In my experience that's the sign the system is restricted. I can get mine to pulse by restricting the intake air when it's running hot. I just open it up a bit and it smooths right out.

Mat got it in one; sometimes its due to the fuel burning so hot that you cannot bring in enough air it smooths out pretty fast

Thanks a lot guys. I'll check the flue junction then.

I observe this phenomena every time I light up a fire. I have a Quadrafire stepped top wood stove with outside air supply through a 3 inch (about 8 cm) air pipe. After lighting the fire with paper, cardboard and kindling it burns very quick and needs a lot of air. As long as the door is open it burns very quick and hot and starts to light the wood logs. All air comes through the open door. After about 5-10 minutes or so I slowly close the door and the fire starts to pulsate when the door is almost close. On the spring handle of the door I can feel the pulsating pressure. I call this this the "V1" or "Buzz bomb" phenomena, because it is a thermo-dynamic effect which was used in the V1 pulsating engine. Hot combustion leads to a flash burn of hot gases, which go out the pipe, causing an immediate underpressure inside the burning chamber, which sucks in fresh air through a spring loaded check valve for another quick burn of volatile gases. My stove door with the spring handle acts like this check valve and I can feel the rapid pressure changes when I lightly push against it. The fire goes wild at this time! Rapid pulsating combustion of volatile hot smoke gases similar to injected kerosene! Once I fully shut the door, the cumbustion air is sucked into the stove through the outside air pipe and the combustions slows down to a steady burn which I regulate with 2 separate fresh air dampers for primary (lower) and secondary (upper) combustion. Interesting effect indeed! Love to play with it...