- Local time
- 5:52 AM
- Joined
- Oct 25, 2010
- Messages
- 37,131
- Reaction score
- 145,839
- Location
- Monroe, New York
the NASA thread and anything related
- Thread starter snakeyes
- Start date
Rishi
Well-Known Member
That X video is hilarious. But the bible-thumping flat-earther harassing Neil Armstrong is just.... sad.
- Local time
- 5:52 AM
- Joined
- Oct 25, 2010
- Messages
- 37,131
- Reaction score
- 145,839
- Location
- Monroe, New York
someone didn't like the video it disappeared
- Local time
- 5:52 AM
- Joined
- Oct 25, 2010
- Messages
- 37,131
- Reaction score
- 145,839
- Location
- Monroe, New York
Rishi
Well-Known Member
yay, it's back.
why someone even bothered to make the fakey video is puzzling.
why someone even bothered to make the fakey video is puzzling.
- Local time
- 2:52 AM
- Joined
- Mar 14, 2012
- Messages
- 19,325
- Reaction score
- 40,266
- Location
- Surrey, B.C. Canada
Taken by the satellite Magellan in the 1990s, this image shows lava flows on the surface of Venus. This imaging radar photo cut through the thick clouds to see the surface. This scene in this photo is 500 kilometers across.
Expedition 71 Soyuz Rollout (NHQ202403180020)
The Soyuz rocket is raised vertical Monday, March 18, 2024, at launch pad Site 31 of the Baikonur Cosmodrome in Kazakhstan. Expedition 71 NASA astronaut Tracy Dyson, Roscosmos cosmonaut Oleg Novitskiy, and Belarus spaceflight participant Marina Vasilevskaya are scheduled to launch aboard their Soyuz MS-25 spacecraft on March 21. Photo Credit: (NASA/Bill Ingalls)
***
2024 Total Solar Eclipse (NHQ202404080101)
A total solar eclipse is seen in Dallas, Texas on Monday, April 8, 2024. A total solar eclipse swept across a narrow portion of the North American continent from Mexico’s Pacific coast to the Atlantic coast of Newfoundland, Canada. A partial solar eclipse was visible across the entire North American continent along with parts of Central America and Europe. Photo Credit: (NASA/Keegan Barber)
Russian rockets often have many engines because of a design philosophy that prioritizes redundancy and efficient thrust generation by using multiple smaller engines rather than a few very powerful ones, allowing for better performance even if one engine fails, and often stemming from their focus on developing highly efficient liquid fuel engines with multiple combustion chambers within a single engine unit, which can appear as "many engines" on a single stage.
Key points about Russian rocket engines:
- Redundancy:
Having multiple engines means that if one fails during launch, the remaining engines can still provide enough thrust to complete the mission, improving reliability.
- Efficient Design:
Russian engineers often focus on optimizing existing engine designs, like the "staged combustion cycle," by splitting the combustion process into multiple chambers within a single engine, leading to a high thrust-to-weight ratio.
- Historical Context:
This design approach originated in the Soviet era when there was a strong emphasis on developing powerful intercontinental ballistic missiles, which required high thrust with a focus on reliability.
Example: The Soyuz rocket, a widely used Russian launch vehicle, has four engines on its first stage, each with multiple combustion chambers, which contributes to its overall high thrust capability.
How did the USSR manage to use so many engines on their rockets (Soyuz, Vostok, etc.)?
Answer (1 of 2): With great difficulty. There were 32 nozzles igniting all at once on a Soyuz mission booster. They managed to reduce that to twenty for the Vostok series. Getting that many to ignite at the same time had quite a learning curve, and the failures were spectacular and deadly. One o...
JR_Charger
Well-Known Member
I bet the cost and difficulty of developing a big engine they will not need many of had something to do with it. Just looking at the world of Mopar, how many 440's were needed vs 318's? If it were as easy to put a motor in a car as it is to strap one to a plane or rocket, we'd probably have R/T's with two 318's instead of one 440.
January 29th - on this day 1964, NASA - National Aeronautics and Space Administration launched the Saturn-Apollo 5 (SA-5) mission from Cape Kennedy's Launch Complex 37B. This was the first flight of the Block II Saturn I rocket - for the first time including a functional second stage.
This was powered by six RL10 engines, modern variants of which still power United Launch Alliance's second stages for the Atlas V, Delta IV and Vulcan-Centaur launch vehicles, as well as the Interim Cryogenic Propulsion Stage (ICPS) of NASA's Space Launch System.
While not a primary objective of the SA-5 mission, the second stage actually reached orbit, becoming the largest spacecraft to achieve that at the time.
Similar threads
