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Pseudo ILS


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mustang
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Hi,
SD pseudo ILS  works with the runway threshold coordinates,giving a 50ft too low 3° vertical trajectory.
As we pass over runway threshold at 50ft,the touch-down point is 300 meters ahead,at the approximative
place we see tire marks on concrete runways.Abeam the glide path antenna.
Is-it not conceivable to make guidance towards the touch-down point coordinates in place of threshold ones?

Sky Painter
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mustang - 1/31/2021 12:28:04 PM
Hi,
SD pseudo ILS  works with the runway threshold coordinates,giving a 50ft too low 3° vertical trajectory.
As we pass over runway threshold at 50ft,the touch-down point is 300 meters ahead,at the approximative
place we see tire marks on concrete runways.Abeam the glide path antenna.
Is-it not conceivable to make guidance towards the touch-down point coordinates in place of threshold ones?

I stand to be corrected, but I understand that both vertical and horizontal guidance is by reference to the published airfield reference point, which is often about mid-field.


Mike
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grahamb
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Given that Pseudo ILS disables the glideslope at 500’ agl, why does it matter? What about offset ILS, does it cope with that?

It is not a substitute for a proper instrument procedure with the proper equipment, be it ILS or GNSS, and trying to use it like one is folly. SD is a VFR tool. 

IMHO of course. 


Edited 1/31/2021 2:53:18 PM by grahamb
pilot-byom
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Skydemon pseudo-ILS does take the airfield reference point from AIP - which may be neither at a threshold nor even close enough to the runway in use, see i.e. EGDM when approaching runway 35 the 'aiming point' is 0.8nm West of the runway or EDXR 0.2nm East of the main asphalt runway. Be aware - if you start looking out from 500ft you may not see a runway ...

My opinion: as long as you don't manually input the threshold coordinates from AIP this carries the potential to be a dangerous gimmick if shit hits the fan. Skydemon is a VFR tool by these reasons and it may even not hold until the edge of marginal VFR ...

Edited 1/31/2021 7:35:03 PM by pilot-byom
Tim Dawson
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SkyDemon does not use the ARP for its pseudo-ILS feature. It uses the threshold coordinate of the runway you have selected.
efrenken
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Tim Dawson - 2/1/2021 2:45:25 PM
SkyDemon does not use the ARP for its pseudo-ILS feature. It uses the threshold coordinate of the runway you have selected.

Tim,
Thank you for adjusting pilot-byom’s information. That is how I thought SD works and how I believe to have read it (in the manual?). I was about to question the usefulness of SD’s pseudo-ILS feature.
Eric

pilot-byom
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Tim Dawson - 2/1/2021 2:45:25 PM
SkyDemon does not use the ARP for its pseudo-ILS feature. It uses the threshold coordinate of the runway you have selected.

Sorry, this is not what I encountered.
Where do I find the threshold coordinates of an airfield to check a specific one? 

grahamb
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pilot-byom - 2/4/2021 7:46:01 AM
Tim Dawson - 2/1/2021 2:45:25 PM
SkyDemon does not use the ARP for its pseudo-ILS feature. It uses the threshold coordinate of the runway you have selected.

Sorry, this is not what I encountered.
Where do I find the threshold coordinates of an airfield to check a specific one? 

In the AIP. Depending on the country concerned the may be shown on the aerodrome chart, but certainly should be in the text section. 

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grahamb - 2/4/2021 9:15:33 AM

In the AIP. Depending on the country concerned the may be shown on the aerodrome chart, but certainly should be in the text section. 

I am absolutely aware of the paper world. My question was regarding the data in Skydemon, where to find that data to see why it is not working as intended. I will check with my custom airfields on the next trip anyway and expect, following Tim Dawsons comment, that it pulls my threshold data from the custom data editor. If not, I'll be back for sure.

Tim Dawson
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Why not post back here whatever you discover?
GO

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