Search found 1032 matches

by steve
Fri Dec 23, 2005 11:51 pm
Forum: Rocket forum
Topic: Rcandy Aerospike
Replies: 24
Views: 11021

Re: re: Candy rocket rules of thumb

Steve, is that a spike nozzle I see on your casing in the video intro picture? Does it work? So far the aerospike has only been tested with compressed air @ 150 psi and that was very impressive! I couldn't believe how much thrust was generated even at such a low pressure. The throat area is equivil...
by steve
Fri Dec 23, 2005 8:54 pm
Forum: Rocket forum
Topic: Candy rocket rules of thumb
Replies: 4
Views: 4944

re: Candy rocket rules of thumb

good question, I haven't been able to find that info on jimmy yawn's site which is pretty much the standard for this sort of thing. for my engine (which I just test fired for the first time this morning!) I made the hollow section in the grains the same as the nozzle throat (3/16). I'm pretty sure t...
by steve
Thu Dec 22, 2005 2:51 am
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

Re: re: Schlieren Images for the masses

I've watched Larry's Dynajet in a schlieren setup while he was trying to start it. Every time the engine would burp it looked like an explosion of bubbles coming out of the tailpipe. The synthetic stuff is interesting, but seeing it in real time with your own eyes is incredibly amazing. Larry's mir...
by steve
Wed Dec 21, 2005 9:27 pm
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

re: Schlieren Images for the masses

here's the same candle picture with the settings tweaked.

max x and max y displacements = 3

the original was 9
by steve
Wed Dec 21, 2005 9:25 pm
Forum: Off topic forum
Topic: World Jump Day
Replies: 16
Views: 7237

re: World Jump Day

jump day was a running joke in our high school physics class, though I'd forgotten it untill now!
by steve
Wed Dec 21, 2005 4:47 am
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

re: Schlieren Images for the masses

I got my candle to work, but I can probably get better results then this if I work at it. its a start anyway.
by steve
Wed Dec 21, 2005 1:22 am
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

re: Schlieren Images for the masses

I tried running digiflow but cant seem to get it to "run the program" no pictures show up under output.
by steve
Wed Dec 21, 2005 1:08 am
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

re: Schlieren Images for the masses

here are pics from my latest test. the originals were almost 7mb so they had to be scaled down- i'm sure that probably screwed everything up, but I'd figure I'd post them anyway.
by steve
Tue Dec 20, 2005 11:02 pm
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

Re: re: Schlieren Images for the masses

Steve, I ran a synthetic schlieren on the pictures. The results are attached. Not that interesting -- there are two features that might be shocks (see density.bmp). that is probably turbulence resulting from the flow seperation at the tip of the nozzle. I'll try to get some better images tonight.
by steve
Tue Dec 20, 2005 3:44 pm
Forum: Valved pulsejet forum
Topic: Steve's tiger jet
Replies: 7
Views: 3422

re: Steve's tiger jet

yeah, it is really nice. I can't wait to start playing with the CNC stuff too. BTW, I was pretty impressed with the work you've done on pulsejet/turbine. I'd be curious to know weather it would work with a valveless engine or weather the acoustical interferance with the turbine would be too much for...
by steve
Tue Dec 20, 2005 3:26 pm
Forum: Off topic forum
Topic: Hey guys- I'm not dead!!
Replies: 8
Views: 2523

Re: re: Hey guys- I'm not dead!!

The only real reason I went to college was girls. Times seem to have changed. I know the feeling. Perhaps I should make myself a T-shirt with the text "I went to college for the girls and all I got was a lousy education"? that's a good one! Actually the male/female ratio at Flordia tech is about 70...
by steve
Tue Dec 20, 2005 4:02 am
Forum: Tools and Construction
Topic: Schlieren Images for the masses
Replies: 41
Views: 18748

re: Schlieren Images for the masses

here are pictures from one of my attempts.
by steve
Tue Dec 20, 2005 3:50 am
Forum: Valved pulsejet forum
Topic: Steve's tiger jet
Replies: 7
Views: 3422

Re: re: Steve's tiger jet

Nice job, Steve. Is the blow tube pointing so that it blows over the holes in the fuel thing? It mught not work if it doesn't. My 1/4-32 spark plug was something like $17, so I'm afraid I won't sell it for $10... oops- It might have been 1/4-32 after all, I'll have to consult the plans again. I gue...
by steve
Mon Dec 19, 2005 11:58 pm
Forum: Valved pulsejet forum
Topic: Steve's tiger jet
Replies: 7
Views: 3422

re: Steve's tiger jet

the plans say .15 but .2 would be fine since I'm not that concerned about weight. I probably wouldn't get up the nerve to fly it anyway- it took A LOT of work to make and I'd be afraid of crashing it.