Search found 286 matches

by Ghrey
Thu Mar 15, 2012 5:38 am
Forum: Valveless pulsejet forum
Topic: concentric lockwood
Replies: 26
Views: 10225

Re: concentric lockwood

If the intake is umbrella shaped, I tend to suspect that thermal distortion would make it hard to maintain the dimensions within running spec., and yes drag, pernicious drag... If instead that represents separate feeder tubes; I would like to see that tried.... While I am trying engines that have ze...
by Ghrey
Fri Feb 24, 2012 7:34 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 120318

Re: Mike's Build Log

Test?
by Ghrey
Tue Nov 29, 2011 9:30 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

My brief water comment was not intended to be comprehensive, but thank you for that. My greatest concern with methanol is a steady supply at a low cost. It is for my purposes the ideal fuel. The little glue cans usually run dry, but I have pulled some pretty wet stuff out of some pieces of pipe.... ...
by Ghrey
Mon Nov 28, 2011 7:27 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

Multispool; in this case: It comes from my old jam jar formula.... ( follows ) If you have an approximately 2x3 ratio combustion chamber where the 2 is the diameter. then the maximum total port area is .2 x the actual diameter. Somewhat longer vessels still work well with the .2 rule as well. Spray ...
by Ghrey
Sun Nov 27, 2011 11:17 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

This last little bit before there is a pause, More of the little glue can that can. Excerpts from a lengthy session, a Best of if you will. http://youtu.be/rOarXR0DWHI Methanol is the fuel. I have some bigger stuff in the works, but most of my time is devoted to my children, ( 4 and 6 years old ) so...
by Ghrey
Sat Nov 26, 2011 8:29 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

Well I got a nice long reply written then I fumble fingered it and poof.... Mike; It would be fun to get together some time, time and fuel permitting. If you would like a real portrait of persistence I will post a shot of my scrap pile, If I can stand far enough back to get it all in frame... :) Mar...
by Ghrey
Fri Nov 25, 2011 6:16 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

Just a brief note for a not so brief video...

http://youtu.be/CDxlaS_q2jk

Happy Thanksgiving.
by Ghrey
Sat Nov 12, 2011 6:02 am
Forum: Valveless pulsejet forum
Topic: concentric lockwood
Replies: 26
Views: 10225

Re: concentric lockwood

As much as I love the concept of concentric / annular / coaxial designs they have real major problems Heat being primary. Over heating. Warping. you name it.

I am still trying to make one work well, no luck.

I am convinced that some day some one will make a good one.

Just my .02
by Ghrey
Tue Aug 16, 2011 8:24 am
Forum: Valveless pulsejet forum
Topic: underwater operation of pulse jets
Replies: 15
Views: 5721

Re: underwater operation of pulse jets

Ok found the silly thing..... ( see attached )
by Ghrey
Thu Jul 14, 2011 4:12 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

I auto posted the final cut a wile ago and it defaulted to private, This took me a wile to sort out.

Here ( I hope ) it is...

http://www.youtube.com/watch?v=IQ-mGbl6bWs


Brant
by Ghrey
Thu Jul 07, 2011 9:00 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

Re: More in the saga of Thermo-Jam ( and other musings )

Brief update;

I got some work done this evening/early am on the carburetor for my next test, which will be made of pipe. Took lots of pics.

This next one will not, strictly speaking, be valveless.

More in a wile.

Brant
by Ghrey
Wed Jun 15, 2011 7:14 am
Forum: Valveless pulsejet forum
Topic: More in the saga of Thermo-Jam ( and other musings )
Replies: 30
Views: 12322

More in the saga of Thermo-Jam ( and other musings )

I suppose I should sort of make this a build thread of sorts, .... over time... For now I will give the preliminary video of some of my recent activities ( some of you have already found the YouTube video ) and some stills of the star of the show. The Video.... http://youtu.be/O7Cceo43MbI <iframe wi...
by Ghrey
Tue Apr 12, 2011 7:54 am
Forum: Valveless pulsejet forum
Topic: Any Input?
Replies: 32
Views: 8891

Re: Any Input?

Just some thoughts from the recesses of my much tortured mind; 1. A Messerschmitt style flame holder may prove to be mandatory, or a corrugated version there of... 2. My work ( so far all failures, as in parts melt... ) with annular designs shows a propensity toward thermal material failure. The ins...
by Ghrey
Mon Mar 07, 2011 1:38 am
Forum: Rocket forum
Topic: How Can I Make a "Slow and Soft" Sugar Rocket?
Replies: 23
Views: 17577

Re: How Can I Make a "Slow and Soft" Sugar Rocket?

A long time ago I tried MSG in some propellant, It burned SLOW. Sadly no notes ( or none that I can find ) survive from that experiment.
It would take some test batches to see if it will work for you. It is however a cheep additive.


Cheers.
by Ghrey
Wed Dec 08, 2010 8:17 am
Forum: Valveless pulsejet forum
Topic: Plastic Jam Jar Silliness
Replies: 0
Views: 1265

Plastic Jam Jar Silliness

Just fooling around tonight...
.:.
http://www.youtube.com/watch?v=BG2gPFmqWI4