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Results tagged with engine-design
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user 18458
Questions regarding the design or design process for a propulsion system.
31
votes
3
answers
7k
views
Why cool engines with fuel as opposed to oxidizer?
As I was watching Tom Mueller describe the Merlin engine, he said that the RP-1 propellant is pumped through ribs in the nozzle to regeneratively cool the engine. Also, a video about Copenhagen suborb …
- 4,305
8
votes
1
answer
438
views
TR-106 under-expansion in sea-level test?
I was looking at pictures of a test fire of a TR-106 engine, and it appears to be fairly under-expanded.
What's the reason for this? Does this somehow increase efficiency with this specific engine? …
- 4,305
6
votes
Accepted
Pro/cons of burning propellant in stochiometric ratio?
There are several factors as to why an engine would not run the “ideal” stoichiometric ratio of fuels. Here are the two main reasons why rocket engines wouldn’t run the “ideal” ratio.
Higher exhaust …
- 4,305
3
votes
1
answer
159
views
Rocket engine power vs. Sound
Is there any relationship between the sound emitted from a rocket engine and the amount of thrust it gets at surface temperature and pressure?
- 4,305
9
votes
3
answers
2k
views
Is ISP all there is to engine efficiency?
Most rocket engines have their efficiency measured by the specific impulse of the engine, which is just how fast the exhaust of the engine is going. Is there another measure of efficiency that's thrus …
- 4,305