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Did you ever was so desperate that you used RCS for mid course correction burn? XD


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1 hour ago, klgraham1013 said:

Sometimes it's actually part of my plan.

This.  RCS is typically only something you carry with you for rendezvous and stabilization purposes, but its wonderfully efficient for small correction burns. 

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I've ended up using mono to complete burns a few times... even resorted to getting out and pushing on a couple, to get those last few m/s of delta-v.

jAKtYxP.jpg

One thing that's a bit puzzling about the video is why there's mono (and a lot of it) on the vehicle, given that there's a pretty huge reaction wheel included for for the vehicle's size. I don't think I've ever put RCS on anything I wasn't going to dock and even then if the vehicle's of the space golf cart variety, I tend to leave the RCS at home.

 

Edited by purpleivan
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Considering that most rocket engines aren't re-startable, isn't this how its done in real life?

I use it all the time with fine control enabled to get the intercepts just right for gravity assists or direct aerocapture, etc....

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1 hour ago, KerikBalm said:

Considering that most rocket engines aren't re-startable, isn't this how its done in real life?

Yes, it is. Generally the only engines with more than 1 or 2 ignitions beyond the first ignition are lander engines (with exceptions being the main engines of probes like Cassini which are expected to make a lot of different burns), so the attitude control thrusters are usually what's used for small correction burns. Additionally, attitude control thrusters are often used instead of reaction wheels or gimballing because they're typically less massive than reaction wheels or the extra hardware that would have to be added to an engine to allow it to gimbal.

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5 hours ago, purpleivan said:

I've ended up using mono to complete burns a few times... even resorted to getting out and pushing on a couple, to get those last few m/s of delta-v.

jAKtYxP.jpg

One thing that's a bit puzzling about the video is why there's mono (and a lot of it) on the vehicle, given that there's a pretty huge reaction wheel included for for the vehicle's size. I don't think I've ever put RCS on anything I wasn't going to dock and even then if the vehicle's of the space golf cart variety, I tend to leave the RCS at home.

 

:D 

 

It's remind me when i work in charity as fundraiser  and we often was forced to push my boss FIAT multipla car because it had spark plug problem :D 

Fiat_Multipla_front_20080825.jpg

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Sometimes my main engine is way too powerful to adjust an orbit by the 0.3 m/s of dV needed to get my intercept altitude just right. When you're still 10 billion meters away from the planet, the tiniest push dramatically alters your orbit. Rather than over burn, then having to flip 180 degrees, and whoops I did too much again, flip over again, etc. RCS makes fine tuning a breeze.

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RCS actually works quite well for minimal mid-course corrections because you can thrust in any direction without having to reorient your craft (assuming you placed your thrusters correctly).

On 3/9/2017 at 5:35 AM, eloquentJane said:

with exceptions being the main engines of probes like Cassini which are expected to make a lot of different burns

And these engines are usually hypergolic or use monoprop, so they might as well be RCS thrusters. In fact, the engines on Cassini were derived from the Apollo RCS system!

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On ‎9‎/‎3‎/‎2017 at 8:19 PM, jhousen said:

best fine adjust technique I know of

this.

plus there were several times I was out of fuel and used RCS for the final push into Kerbin Atmo to get captured or complete refueling station rendezvous

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I've used it to deorbit; when a dumb mistake meant I was out of fuel with an apogee of 200km and a perogee of 72km, the RCS let me deorbit the last few km for aerobraking, and my guys were able to make it home.

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Just a few days ago I even had to set the thrust limiter to around 8% because just tapping H or N as brief as possible was still adjusting my orbit too much. (IIRC I was about a year and a half out from my target)

Using the main poodle engine would have been way too much.

18 hours ago, Sun-Guardian said:

... then I just use an Eva kerbals to get re-entry paths. :cool:

Been there!  30 trips from pod to back of the craft for I think about 250m/s just to get home.

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