Search found 286 matches

by Ghrey
Sat Aug 29, 2009 8:30 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

As promised in another Thread; Construction details. DSCN6761.JPG DSCN6754.JPG DSCN6751.JPG DSCN6750.JPG Pretty simple stuff. The vent holes were made with an "I" drill. not 1/4" ( .635cm ) as I had thought, but it was in the ball park ( a large park.... ) The OD of the rod is Very close to 1/2" ( 1...
by Ghrey
Sat Aug 29, 2009 2:00 am
Forum: Valveless pulsejet forum
Topic: Mitch's Newbie Valveless jet thread
Replies: 8
Views: 3360

Re: Mitch's Newbie Valveless jet thread

Try putting it in a water jacket before you bore it bigger. Metal jam jars heat up fast. They do not run over heated. I realize now that I totally blew it in that thread. I showed no, or few construction details. When I get home I will rectify that. For now suffice as to say it is all nuts washers a...
by Ghrey
Thu Aug 27, 2009 11:39 pm
Forum: Valveless pulsejet forum
Topic: Really basic capped PJ
Replies: 6
Views: 2208

Re: Really basic capped PJ

That odd little, noisy, bit of scrap, has given me an idea for a capped tube that would not be annular.

I will try to get a better camera....
by Ghrey
Thu Aug 27, 2009 7:54 pm
Forum: Valveless pulsejet forum
Topic: Really basic capped PJ
Replies: 6
Views: 2208

Re: Really basic capped PJ

Another problem, is that the inside "layers" if you will, have effectively NO cooling, this can distort and destroy even the most durable materials. The annular design is not impossible but it is NOT for the average beginner.

And yes I am still working on one, Glutton for punishment I guess....
by Ghrey
Thu Aug 27, 2009 5:10 pm
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

Wish I filmed that well, or sounded that good...

Audio would be nice.
by Ghrey
Thu Aug 27, 2009 8:44 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

It was not running as well this evening, but running so I tried to film...
ThermoJam.mov
First video attempt
(474.88 KiB) Downloaded 169 times
Or

http://www.youtube.com/watch?v=oO4KJ_ZNcLs


Also my first attempt at iMovie...

This was a few 40 ( yes it goes 40 seconds mot 30 like I thought... ) second clips edited and pasted for a best of...
by Ghrey
Thu Aug 27, 2009 6:00 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

vturbine: Yes the camera that I have access to does have that capability, but only 30 seconds or so at a time and NO audio. The quality is also not so good. No pardon required; I am never offended when the intent is to help. I could give it a try just for s&g's Joe: Yes that does seem to be what it ...
by Ghrey
Wed Aug 26, 2009 7:37 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

Ok V 3.0 with a 16" tail does not even try, so I screwed in the remaining piece of tubing ( with the inside coupler ) still not much. I then tried to unscrew the lid to put it on a new body, The glue I used as sealant prevented this. This whole time I would give the original a flash with the torch a...
by Ghrey
Wed Aug 26, 2009 6:15 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

V 2.0, Scrap.
by Ghrey
Wed Aug 26, 2009 6:13 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

The pipe is a lamp part and uses an internal ( read as flow restrictor ) all thread tube for mounting. I have noted considerable out flow through the pipe. I would say that what we have here is fast qualifying as a pulse jet. Further I suspect that any jam jar given these modifications //should// do...
by Ghrey
Tue Aug 25, 2009 6:43 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

Just an update ; Further tests indicate the following: 1) No way did this unit operate for 7 seconds. Maybe 1.5 tops It just seemed long.... 2) It starts like a typical Jam jar but then briefly "locks in" like a more typical VPJ the Zip sound that it finishes with. 3) It most likely stops due to a l...
by Ghrey
Mon Aug 24, 2009 8:05 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

Wow, very interesting! 16" snorkel on a 3" depth jar . . . and a 3/2 CC aspect ratio. I'm really looking forward to seeing a photo of it and how the vents are arranged. Done! DSCN6737.JPG The whole little thing... DSCN6736.JPG Vents DSCN6738.JPG CC View with scale for well.... scale... Did you try ...
by Ghrey
Sun Aug 23, 2009 9:13 am
Forum: Valveless pulsejet forum
Topic: Collected works of F. H. Reynst
Replies: 9
Views: 3260

Re: Collected works of F. H. Reynst

Wile I would truly love to own an original copy even 1/4 the listed price is well outside my current budget. :(

I do hope you find a worthy recipient, and thank you for your promptness.
by Ghrey
Sun Aug 23, 2009 6:14 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

I guess a loud purr would be apt. Forgot the camera today. I will try to find a way to get audio. Edit; No that does not do it: There is the usual starting whoosh followed a Deep slow purr that increases in both volume and frequency. It does accelerating putting I guess !??!?!?!?! The no cooling is ...
by Ghrey
Sat Aug 22, 2009 8:29 am
Forum: Valveless pulsejet forum
Topic: metal jam jar experiments
Replies: 458
Views: 181556

Re: metal jam jar experiments

Guess I will have to join in here; I was rummaging around in my private dump ( garage ) and found a glue jar ( steel vessel ) it went to the drill press, I added some fuel, It made a pleasing little zip. Grinnnnnnnnnnn........ Found a tube from a lamp ( with coupler and nut ) and drilled 2 intake po...