mechjeb landing guidence

[gmcr70]

Hi,

Using landing guidance causes ships to crash into ground, they never slow to specified 0.5m/s.

Landing Interface says "Debug Info: PowerCoastDecentSpeedPolicy"

Opened debug log window and found this:

"[Exception]: NullReferenceException: Object reference not set to an instance of an object", and no reference to a "Policy" option.

Is there some way to have mechjeb gradually descend, rather then wait till the last second to fire engines?

and what does the exception mean?

thanks,

G, brooklyn

[smjjames]

Probably better to ask on the main thread itself

Which landing mode are you using? I've found 'land somewhere' to be overeager with the time warp. If it's the targeted landing, you're going to need to supply more info.

as for the exception, I don't know what it means.

[Targa]

I've used MechJeb since last year and the only time I've ever encountered this behavior is when I started the landing procedure myself and was descending too rapidly. Turning Landing Guidance on at that point usually ended up with MechJeb slamming the ship into the planet surface. You need to enable Landing Guidance from a stable orbit for best results. I've used "land somewhere" as low as 20 meters off the ground and never had an issue. It's great for those "uh oh" moments when you've botched a manual landing, or are moving a ship short distances across the planet surface. The main thing to remember is that MechJeb can't perform miracles. If your descent speed is greater than your available thrust, nothing can save your ship. Lastly - always, always F5 before deorbiting. Use "pick a spot to land", "enter coordinates", or "land somewhere" from a stable orbit and report back the results.

[gmcr70]

thanks.. I will repost there.

I am using it from all sorts of altitudes, from orbit to ~1600m, perhaps I should try lower..