Search found 120 matches

by Najm
Sat Dec 27, 2008 3:39 pm
Forum: Ramjet forum
Topic: 50 mph ramjet???
Replies: 30
Views: 13734

Re: 50 mph ramjet???

uhh wont thrust be directed in the direction of the rotation??
just a thought....
would have to angle the thrust in the chamber a bit if you want some forward motion....
the stators are the key....
by Najm
Sat Dec 13, 2008 6:39 am
Forum: Ramjet forum
Topic: 50 mph ramjet???
Replies: 30
Views: 13734

Re: 50 mph ramjet???

The ramjet will be moving btw... :D
Nice idea, will require some calculation if you are proposing stators in a ramjet, but then the ramjet will not remain a ramjet... It will become something else, dunno what...
by Najm
Fri Dec 12, 2008 10:12 am
Forum: Ramjet forum
Topic: 50 mph ramjet???
Replies: 30
Views: 13734

Re: 50 mph ramjet???

Good idea for a static thrust producing ramjet...
How to rotate the ramjet though??
by Najm
Sun Dec 07, 2008 2:12 pm
Forum: Ramjet forum
Topic: Thinking about ram-rockets
Replies: 9
Views: 5343

Re: Thinking about ram-rockets

okay....
but testing would be a good idea...
by Najm
Fri Dec 05, 2008 2:14 pm
Forum: Ramjet forum
Topic: Thinking about ram-rockets
Replies: 9
Views: 5343

Re: Thinking about ram-rockets

Just wondering...
Why would the rocket reach apogee while the ramjet is producing thrust?
by Najm
Thu Jul 17, 2008 5:21 am
Forum: Rocket forum
Topic: Propellant Question
Replies: 31
Views: 23877

Re: Propellant Question

Has anyone tried using a binder to bind the KNO3/Charcoal mixture? Would be easier to cast this way. Also Kn would be more predictable. I currently don't have any equipment to melt the sugar propellant. And I'm not stupid enough to try melting moderately large batches of the stuff over an open flame...
by Najm
Mon Jan 29, 2007 7:05 am
Forum: Ramjet forum
Topic: The Great Ramjet Challenge!!!
Replies: 307
Views: 118684

I recently made a ramjet from an aerosol can and aluminium. One of my best builds so far... Intake dia=3.75 cm, length=18.6 cm Combustion chamber dia=7 cm, length=11.5 cm Exhaust dia=4.4 cm, length=4.85 cm Runs pretty well, and there is no heating on the walls of the ramjet.(I am thinking even if th...
by Najm
Thu Jan 18, 2007 5:30 am
Forum: Ramjet forum
Topic: Diffuser data
Replies: 1
Views: 2813

What about diffusers which have curved walls?
Like the one shown in the attached figure.[/img]
by Najm
Mon Dec 18, 2006 10:24 am
Forum: Ramjet forum
Topic: The Great Ramjet Challenge!!!
Replies: 307
Views: 118684

re: The Great Ramjet Challenge!!!

I'm also entering this challange!!!
But first let me get finished with my midterm exams....
BTW How to measure the thrust??
by Najm
Sun Dec 10, 2006 9:24 am
Forum: Ramjet forum
Topic: New ramjet experiments
Replies: 67
Views: 36553

re: New ramjet experiments

Good run.
And congrats on getting an engine to run properly. (with noise)

P.S. Pause the video and set the seeker on 1:32
by Najm
Wed Dec 06, 2006 1:55 pm
Forum: Ramjet forum
Topic: Aerosol cans
Replies: 22
Views: 12896

re: Aerosol cans

Soup cans die real quick in high heat, anything that gets red will easily burn through a chunky soup can.
Thats because it is made out of tin.
by Najm
Tue Dec 05, 2006 1:48 pm
Forum: Valveless pulsejet forum
Topic: Fishmouth tailpipe increases thrust?
Replies: 6
Views: 2886

re: Fishmouth tailpipe increases thrust?

It would, at least, be quieter.
Less powerful explosion.
by Najm
Sun Dec 03, 2006 6:50 am
Forum: Ramjet forum
Topic: Calculations... double checking with the pro's
Replies: 77
Views: 38252

re: Calculations... double checking with the pro's

Nice run.
My ramjets also didn't got red hot, only the exhuast nozzle showed signs of getting heated(on one side) and that was because the leaf blower was not in line with the ramjet's central axis.
As a rule the ramjet's body should not get red hot.
by Najm
Sat Dec 02, 2006 10:01 am
Forum: Ramjet forum
Topic: New ramjet experiments
Replies: 67
Views: 36553

re: New ramjet experiments

Sorry , double post.
The page wasn't loading.
by Najm
Sat Dec 02, 2006 10:00 am
Forum: Ramjet forum
Topic: New ramjet experiments
Replies: 67
Views: 36553

re: New ramjet experiments

I don't know what I want to do next... remove the baffle or cut the tail cone...any ideas???
Increase the dimeter of the tail cone, the secondary flame holder might have been helping in combustion( slowing down the gases).
It's just an idea, up to you to do what you want to do.