Jet engine vs Rocket engine

[DaveH]

Here’s a bit of fun – Question: I want to know the main difference between a Jet engine and a Rocket engine?

Your answer must be limited to 20 words or less. So com’on all you clever clogs start thinking.

I have an answer so let’s see if we can get a match.

Dave

 

[lazylathe]

Okay, here goes! Ek sal saam speel!

Reaction engines use jets of fluid to generate thrust.
Rocket engines use the propellants mass to generate propulsion.

18 words!!
How was that??

Andrew

 

[Majorstrain]

Ok i'll give it a go. ;D

Jet engines are rocket engines with heaps of moving parts thrown in to lower the thrust and justify the cost. :big:

Smack on 20 words

or

Jet engine failure - ka-ching, bang, thump, bang, bang, bang. Rocket engine failure - KA-BOOM, sizzle, silence. 8)

15 words, 17 if you don't like hyphens

You didn't say I had to be correct.

Cheers,
Phil

 

[compspecial]

All the oxygen for combustion in rockets is contained in the fuel not sucked in

 

[DaveH]

WOW! there sure are some clever people out there. But no cigar - quite close. ;D

Please try to keep your answer simple - for me :-*

keep on trucking

Dave

 

[DaveH]

Phil

Must be the middle of the night there!

I like your answer ;D
Dave

 

[Bill Gruby]

A Rocket is full thrust all the time a jet can be throttled.

"Bill Gruby"

 

[Majorstrain]

Not that late in Perth yet, 8pm.
Still at work though and a couple of more hours to go.
After a 6:30am start, my serious and sensible brain left for home hours ago, just the sad sense of humor left to keep me company now :

Cheers
Phil

 

[DaveH]

Bill
Your answer is null and void. 20 words or less.
Just because you are a "grumpy clever so and so" does not mean you can change the rules

Luv ya
Dave

 

[DaveH]

I could change just one word in the question - but it might make it too obvious.

Boy O'boy isn't that a clue ;D

Dave

 

[Majorstrain]

Ok, serious brain engaged.

A rocket engine has NO moving parts in the combustion area.

Dam, I've got a headache now. :'(

Phil

 

[Bill Gruby]

Bill
Your answer is null and void. 20 words or less.
Just because you are a "grumpy clever so and so" does not mean you can change the rules

Luv ya
Dave

HUH, there are only 13 words there. I edited it before you posted this. So I'm stayin Grumpy. :bow:

 

[DaveH]

Phil
Good answer, sadly no cigar - I'll send something for your headache.
A Ram jet would comply to your answer.

Dave

 

[cl350rr]

they're spelled different

Randel

 

[Majorstrain]

I'm with Randel, must be the right answer. :bow:

You got me with the Ram jet, I concede defeat.
Along the same lines of variation to the general rule, the ME163 Comet had complete throttle control.
http://homepage.ntlworld.com/andrew.walker6/komet/flight/flight2.htm

About half way down.

“The engines were completely throttleable. Acceleration at first seemed surprisingly slow. The aircraft was poised on small wheel blocks, and when you went from ground idle to full power, the dolly wheels would roll over the blocks, and it took a while to build up flight speed. Once airborne, you accelerated to speed for best climb.

Cheers,
Phil

 

[DaveH]

Randel
WOW that is a cracking answer, where did you find that from?
Not the same as my answer but deserves special recognition.

So you can consider yourself the Third most cleverest person in the world. :bow:

After me and Bill of course ;D
Dave

 

[ksouers]

I'll bite:

1) A rocket engine carries it's own oxidizer. I jet doesn't.

2) A rocket engine can operate in a vacuum, a jet can't.

Take your pick.

 

[b.lindsey]

A jet engine has a central rotating shaft, a rocket engine doesn't

Bill

 

[DaveH]

Time for a clue.

In the question change the word main to obvious.

.........the main obvious diff .......

Dave

 

[cl350rr]

Randel
WOW that is a cracking answer, where did you find that from?
Not the same as my answer but deserves special recognition.

So you can consider yourself the Third most cleverest person in the world. :bow:

After me and Bill of course ;D
Dave

Wow, I'm up from 55th! I got the answer from wikapedia by the way...


a jet has moving parts a rocket does not

a jet takes in air a rocket makes it's own