Vertical speed gauge shows wrong values?

[rudi0310]

Hi,

could not find anything posted to this topic so far. When I set autopilot vertical speed to a climb of 500 ft/min (altitude hold armed), vertical speed gauge shows 400 ft/min. With a stopwatch I found out that aircraft has correct climb speed. This relative error is not the same for different climb and sink rates.

Cheers
Rudi

[Krazycolin]

So, you’re saying that the reading is approximate?

[rudi0310]

Hi,

this is no major issue for me, no hurry.

It confused me to read 400 when I commanded 500 ft/min. For a 1000 ft/min climb, it shows 900.

I wonder what happens when I fly without autopilot and fly a climb/descend of 500 ft/min. Regarding the real sink rate, I get an error of 20% then ?

I have no exact overview which relative errors I get for various climb/sink rates so far.

Cheers
Rudi

[rudi0310]

This shows readout after autopilot commands 500 ft/min and has established a steady state

2018-3-23_20-14-13-548.jpg (153.69 KiB) Viewed 1489 times

Cheers Rudi

Edit: changed pic as an upload

[N4GIX]

Re-calibrated the VSI. Thanks for the squawk, Rudi!

[rudi0310]

Thanks, Bill