MechJeb2

MechJeb2

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Suggestion: Landing Autopilot should have "hover" button

CrashCash opened this issue · 5 comments

commented

When I'm landing, I often can't tell the slope of the touchdown point until the last instant.

It would be really nice to have a "hover" button in Landing Autopilot that would abort the landing and switch to the Translatron KEEP VERT mode with 0 vertical speed. Then I could "Neil Armstrong" over the crater lip or whatever.

judging by the current Kerbal fatality rate and amount of parts scattered across the Mun, I'm just really not fast enough to do this myself.

commented

yeah I'd love this, the ability to either thrust horizontally in hover or
change landing point would be very nice!

I thought it was just me being lame and leaving kerbals smeared all over
the mun scape!

On 23 October 2013 23:22, CrashCash [email protected] wrote:

When I'm landing, I often can't tell the slope of the touchdown point
until the last instant.

It would be really nice to have a "hover" button in Landing Autopilot that
would abort the landing and switch to the Translatron KEEP VERT mode with 0
vertical speed. Then I could "Neil Armstrong" over the crater lip or
whatever.

judging by the current Kerbal fatality rate and amount of parts scattered
across the Mun, I'm just really not fast enough to do this myself.


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commented

+1 good idea

commented

I imagine a button and a number field. The value would be for hold altitude, which references the radar altimeter. The button itself would change depending on context. At any point during the descent you could click it to initiate a hover/hold maneuver (Button would read "Hold"). When transitioning to a hold, and before your surface velocity becomes zero, clicking again would cancel the hold, allowing you to recover from an accidental click with minimal impact.

Once you reach a stationary hover, you would be pointed to maintain a stationary hover and smart ASS would be set to Kill Rot. At this point you have two options, either click on the button again which would resume the descent in a regular fashion (Button reads "Resume"), or you could maneuver to fine tune your landing location.

At any point during the hover, if your horizontal velocity is not zero, clicking on the button again would stop your lateral motion (Button reads "Kill Vel."). Also, the hover would be dependent on Rad-Alt and not Vert-vel meaning that if you were to approach a hill or valley during your hover, you would rise or fall to maintain your altitude above the terrain.

The number field would be a bit more complicated, but would have almost the same behavior as a targeted landing in vacumeallread does.

The only differences are that:

  • It would stop the craft at the indicated altitude above the target as accurately as possible.
  • It would do so independently of the regular landing sequence, the regular vacuum hold would still be observed, or not observed, as is appropriate.
  • When in an atmospheric descent, it would overshoot the target enough that it can hold at the desired rad-alt over the target without needing level flight.

This all assumes a targeted landing. If untargeted, the hold would merely occur at the specified rad-alt.

P.S. If there was a way to paint the landing projections onto the actual surface and not just into the map view, that would be exceptionally helpful in placing tight clusters of landers in one spot.

commented

No, it needs to be much simpler. If the translatron didn't go to "AUTO" and you could hit "KEEP VERT" and it would deactivate the landing guidance, that would be fine. You don't really need a separate hover button.

You can already thrust horizontally in hover. Just uncheck "Kill Horizontal" in translatron and then you can use wasd to tilt whichever direction you want.

commented

closing in favor of #1052