Search found 4 matches

by Dav_Daddy
Sat May 09, 2020 7:16 am
Forum: Valveless pulsejet forum
Topic: Thermojet combustion chamber rear end geometry?
Replies: 0
Views: 3872

Thermojet combustion chamber rear end geometry?

Thus far I've always run a flat rear wall on my combustion chamber, previously with a spark plug in the center. Is there any gains to be made by doming the back wall some? It seems like there could be something there, or on the other hand it could change where the static pressure wave forms and do n...
by Dav_Daddy
Thu May 07, 2020 11:46 am
Forum: Valveless pulsejet forum
Topic: Videos of my valveless pulsejet progression
Replies: 0
Views: 3543

Videos of my valveless pulsejet progression

I've uploaded a longer video of a few of the first runs of my thermojet pulse-jet. I figure as I upload more videos I'll add them here so I'm not spamming up the forum. Also posting a link anywhere else inevitably leads to minimum 45min conversation that at this point I'm sick and tired of having ov...
by Dav_Daddy
Thu May 07, 2020 11:31 am
Forum: Valveless pulsejet forum
Topic: A short video of my thermojet running!
Replies: 2
Views: 3358

Re: A short video of my thermojet running!

Yeah I bought a digital luggage scale from Wal-Mart for about $5 but the thing is nearly worthless. It constantly is either presenting a final weight or recalibrating itself. My old analog fish scale was 1000x better and never begged to be thrown across the yard like this new one. I had planned to d...
by Dav_Daddy
Tue Apr 07, 2020 12:20 am
Forum: Valveless pulsejet forum
Topic: A short video of my thermojet running!
Replies: 2
Views: 3358

A short video of my thermojet running!

I can't find my fish scale to get an idea of how much thrust I'm making. I figure once I either find it or buy a new one I'll rig up a test stand with the pulsejet attached to a red wagon. Then I may try out a thrust augmenter, before I fabricate up an rc boat to begin with. https://youtu.be/NDk-uqg...