Can you add "Arrival Altitude at safety Macready" to the available infoboxes?

This already appears on screen 1.3 as TskArrMc0 but it would be useful to have it available in a navbox on final glide; that way it would be possible to see how much additional safety margin could be available from reducing speed.

[THIS HAS BEEN CHANGED INTO ARRIVAL ALTITUDES AT MC0, both for next and task, so there will be 2 more infoboxes in 1.22]

We already have Arrival altitude using safety MC. TskArrMC0 is using MC 0..

There is a lot of confusion with safetyMC, I am seriously thinking about removing it and use current MC for all calculation. Safety altitude will remain. Only a thought..

There is a lot of confusion with safetyMC, I am seriously thinking about removing it and use current MC for all calculation. Safety altitude will remain. Only a thought..

Paulo, please don't remove pilot selectable safety MC.

I would like to know my arrivals both at current MC and at my selected safety MC setting. If anything goes away it should be MC=0 since, if I want to have MC=0, I can just set safety MC=0.

Like kestrel19 I was unable to find "Arrival Alt at Safety MC" in the selectable parameters for info boxes. ( I looked at everything listed at Config page 19, InfoBox Auxiliary). What is the parameter name?

I did read the manual before checking it out in sim mode. The only "Arrival altitude" I could find on the configuration screen was described as "Task Alt.Arrival". This appears in the nav box as "TskArr" and is definitely dependent on the Macready setting- increasing the Macready setting reduces the arrival height and vice versa. It coincides exactly with the height showing on the final glide bar, and TskArr on screen 1.3. At a high Macready setting it is wildly different from TskArrMc0 (which you would expect to be close to arrival at safety Macready.

I tried using "Next Alt Arrival", but it did the same thing.

Like Andy I would like to be able to see both arrival at current Macready and arrival at either Macready zero or safety Macready, but I can't see how to select the latter in the configuration.

I appreciate TskArrMc0 is doing this, but it doesn't seem to be available in a nav box.

All arrival altitudes available in infobox are dependent on MC as explained at the arrival altitude explanation on the manual. I will create in 1.22 two more infoboxes for arrival altitudes (both for next and task) at MC0 then. I already have those values, as you say.. but I am only painting them on infopages, I did nt think they were necessary as infoboxes as well.

Yes, I read the LK8000 manual, but I have to admit it is still not completely clear to me since the definition of many of the displayable parameters is not complete.

The way I hope it works is this:

Arrival altitude is computed using current MC setting if current MC greater than safety MC. Arrival Altitude is computed using safety MC if current MC is less than or equal to safety MC.

So, if I have MC 5.0 set and want to know my margin at my safety MC of 1.5 I have to reduce MC to safety MC or less. This takes several steps and is not quick if I am using Auto MC.

If I have an info box which always gives arrival at safety MC (TskArrMcS) I don't have to do anything to get the information.

Ok, but.. do we need Arrival Altitudes at sMC or MC0?? Or both??

My opinion is that Mc0 is not needed since I assume anyone thinking of glide margins at Mc0 would either not use safety MC, or would set safety MC to 0.

In that way NxtArrMcS or TskArrMcS can be made equivalent to Mc0 if that is what the pilot wants.

On the other hand, how hard is it to provide both? Let the pilot build the custom info boxes with whichever he likes.

I would say we need to have two available: arrival at current Macready, and arrival at safety Macready (the pilot decides whether he wants safety Macready at zero). I would hope to display both in navboxes (or one on overlay, one in a navbox) on final glide together with auto Macready and Macready speed. My preference would be to have arrival at sMc on the overlay, as now.

Sorry, just realised my last post is unclear (it's getting late). By arrival at sMc I mean at current Macready setting- as we have now. In other words, leave the overlay figure alone and provide arrival at safety Macready in an infobox.

I also think that Safety MC should be used for all the calculations. The pilot can configure to the value he wants to use (even = 0). Doing calculations for smaller MC settings is dangerous because pilot may not be able to reach such a glide efficiency.

The only exception to the above should be presented speed (MC and Dolphin). It should always be calculated for set MC event if it is smaller than Safety MC. Pilot should be able to try fly with better efficiency than Safety MC.

Regarding arrival altitudes with Current and Safety MC. I use Glide Bar Indicator for that. It does not provide an exact value for Safety MC but you will know when you are able to reach the destination. I hope that this bar works with SafetyMC and not MC=0. Paolo?

No the bar is for Tasks and is using MC value (no safetyMC)

One thing must be clear regarding safetyMC. LK8000 is using "at least" SafetyMC for calculations according landables and obstacles. It is not calculating with safetyMC if you set MC higher than safetyMC. This is what i got from Paolo in our last discussions

Final Glide Bar is able to present values for 2 different MC values. It always present a value for current MC but if you are close to reach the destination it also adds results to what XCSoar manual refers is "MC=0". I am not sure if Paolo changed it to SafetyMC when he introduced that parameter or it is still MC0.

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