Calculations... double checking with the pro's

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

Post by Zippiot » Tue Dec 05, 2006 10:55 pm

We cant just give you the answers, that would be cheating!!!

Honestly I have no idea, the formulas and ratios for subsonic ramjets are very hard to find...

We need some people to do a bunch of trial and error tests and try to publish it, reading through many of my rocket books the formulas can easily be found online but when someone walks you through them and every other aspect it becomes much easier.
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thecheat
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re: Calculations... double checking with the pro's

Post by thecheat » Wed Dec 06, 2006 9:06 pm

well... that's kinda what I mean, there seems to be so little on ramjets it's amazing. I did look at the front page of the site and it says the area of the nozzle exit should be approxamately 1.4x the diffuser inlet. I calculated that out and it's 4.72cm... which is pretty close to mine...
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re: Calculations... double checking with the pro's

Post by Zippiot » Wed Dec 06, 2006 9:49 pm

In an eariler post you said the intake entrance was 4.5cm, 1.4x of 4.5 is 6.3

Unless it means the area of the intake and exhaust (gives the same answer). Eitherway you need at least 6.3cm diameter as your exhaust, not 4.72cm
Sailing Student- How do I know if my life jacket is tight enough?
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!

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